DESCRIPTION OF PLATE, 23. G59 



Cryptophialus minutus. 



Fig. 1. Cryptophialus minutus (female with an attached male) viewed 

 laterally, but with the disc (h) rather turned towards the 

 beholder, much enlarged ; #, 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 mem- 



brane 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' y projection behind the labrum. 

 /, palpi. 

 g, outer maxillae, between which and the palpi lie the inner 



maxillee 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 (') segment of the body. 

 i, k, tapering appendages springing from the second and 



third segments of the body. 

 Z, 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. 



