Fig. 1, Cryptophialus minutus (female with an attached male)
viewed laterally, but with the disc (H) rather turned
towards the beholder, much enlarged; _a_, orifice leading
into the sack; H, thin horny disc by which the animal is
attached within its cavity; H′, upper free worn edge of the
disc; _z_, male attached in its usual position to the edge
of the disc of the female.
2, Cryptophialus minutus, natural size, within a half-inch
circle; this represents the largest specimen which I have
ever seen.
3, Half the orifice, with a large portion of the external
membrane and of the membrane lining the sack.
_a_, _a_, dentated horny rim of orifice.
_b_, _b_, external membrane, with the underlying corium or
true skin removed.
_b′_, a horny bar, expanding at its lower end into a toothed
plate, and at the upper end connected with the horny rim
round the orifice.
_c_, _c_, membrane lining the sack.
_c′_, horny bar by which this membrane is strengthened.
_c′′_, thickened membrane, or bar, expanding into fibrous
sheets for the attachment of a muscle.
_d_, delicate lateral lip, within the outer dentated horny
rim.
4, Orifice of sack, cut off, widely open, viewed from above;
_a_, horny dentated rim; _b′_, top of horny bar, where
united to the rim; _d_, inner lateral lip folded backward;
_d′_, lip, with coarser hairs, at the carinal end of the
orifice.
5, Animal with the outer tunics removed, viewed laterally.
_a_, dentated horny rim of orifice, continuous with
_b_, outer membrane, here cut off.
_c_, inner membrane of sack, continuous with
_c_, _c_, the reflexed membrane of the body, by which the
body is united to the disc and outer envelopes.
_e_, lancet-shaped labrum.
_e′_, projection behind the labrum.
_f_, palpi.
_g_, outer maxillæ, between which and the palpi lie the inner
maxillæ and mandibles; these latter are rather exaggerated
in size.
_h_, first maxilliped, in a rudimentary condition, close
above which is the articulation separating the whole mouth
(_o_) from the first (^1) segment of the body.
_i_, _k_, tapering appendages springing from the second and
third segments of the body.
_l_, pedicels of the three pairs of abdominal cirri.
_m_, cirri, three pairs of.
_o_, mouth, of great size, formed by the confluence of the
lower segments of the gnathites.
^1, first segment of body, homologically the last or seventh
cephalic segment.
^2, second segment of body, homologically the first thoracic
segment.
^3, third segment of body, homologically the second thoracic
segment.
^4, fourth segment of body, homologically the third thoracic
segment.
^5, fifth segment of body, homologically the fourth thoracic
segment.
^6, sixth segment of body, homologically the fifth thoracic
segment.
^7, seventh segment of body, homologically the sixth thoracic
segment.
^8, eighth segment of the body, homologically the seventh
thoracic segment.
6, Front of mouth; _g_, outer maxillæ; _g′_, an articulation
separating the mouth from the membrane of the first segment
of the body; _h_, first pair of maxillipeds; whole figure
on same scale with the labrum, fig. 9.
7, Maxillæ, drawn on thrice the scale as the outer maxillæ;
_a_, apodeme.
8, Mandibles, drawn on thrice the scale as the outer maxillæ.
9, Labrum, on same scale with the outer maxillæ, fig. 6, and
one third of the scale of the mandibles and inner maxillæ;
_e_, labrum; _f_, palpi.