92 UNITED STATES NATIONAL MUSEUM BULLETIN 29 6 



The apertural armature varies, as illustrated in outline in figures 

 22c-e. 



The mouthparts are typical, with a long labium, a pair each of 

 mandibles with palps, first maxillae, and second maxillae. The man- 

 dibles are illustrated from a sketch in figure 22f . They are extremely 

 hght and easily broken in this genus. 



There is essentially no head in this species, the body terminates 

 anteriorly in a tapered labral area. 



The esophagus leads to the usual gizzard, equipped with a heavy 

 toothed central section surrounded by a box-like muscle array. 



The thorax bears two dorsal body appendages, not considered 

 paired, which are soft, hairy, and equipped with whorls of scales. 

 The thorax bears the usual fine striations, and a pronounced reinforced 

 area on the dorsal side near the terminal cirri. 



The cirri include an extremely small pair of stumps bearing about 

 four bristles each below the mouth, and three pairs of biramous 

 and multisegmented terminal cirri set on two-segmented protopods. 

 No caudal appendage is present. The setation on the cirri is typical 

 for the genus: two pairs of equal length on the inner curvature and 

 one unpaired seta on the outer curvature up to three segments apart. 



The segment count follows : 



Terminal 



cirrus: 12 3 



Ramus: anterior posterior anterior posterior anterior posterior 



Segments: 14 18 19 21 20 23 



The female retains the embryo to the cyprid stage. The latter 

 appears to be typical of the genus, with peg plates forming the 

 carapace. 



The male : Two males were seen attached to the illustrated female 

 (fig. 22a). Additional antennules without males were seen on the 

 exuviae of the female. The male bears the usual pair of antennules, 

 which are not stalked. No penis was seen, but these males were perhaps 

 immature specimens. The body is rounded or bulgy, and filled with 

 cellular masses. No eyes or yellow organs were noticed. 



Cryptophialus longicollatus Berndt, 1907a, page 200 



Figure 23 



Diagnosis: Cryptophialus with three pairs of thoracic cirri; two 

 dorsal body appendages; with long neck of mantle to aperture; two 

 long spines on mantle aperture; lateral bar terminations pointed, 

 without swelling; to 1.44 mm; in Hcdiotis ovina, from Mauritius. 



