114 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



found in C. cordylacis and C. heterodontus. These species can be sepa- 

 rated by the appearance of the opercular armament. 



The rest of the mantle is typical, but the teeth scattered around 

 on the ventral outer surface appear somewhat heavier than the 

 Australian species. 



The attachment disk is light and diffuse, without an attachment 

 knob or orificial knob. 



The mouthparts are typical. The mandible is extremely light and 

 fragile, and is sketched in figure 29c. 



The dorsal surface of the thorax bears two filamentary appendages. 



The mouth cirri are missing. Three pairs of posterior cirri are set 

 on two-segmented protopods, with oblique sutures. The segment 

 counts for one side of one specimen follow: 



Terminal 



cirrus: 12 3 



Ramus: anterior posterior anterior posterior anterior posterior 



Segments: 12? 15 19?' 19 20 22 



The setation is typical, with all setae plumose. The seta on the 

 outer curvature are two to two and a half times the segment length, 

 while the two pairs of setae per segment on the inner curvature are 

 about one and a half times the segment length. The distal end of all 

 protopods have about five stiff bristles on the outer edges. 



The male: Several males were found, and are typical. A pair of 

 antennules are present, often in a spread position. No naupliar eye 

 or yellow organ was established among the array of cell-balls scattered 

 through the body. The posterior attenuated into an elongated ap- 

 pendage, but the well-developed penis did not appear to enter it. 

 Teeth on the posterior extremity often are serrated, and the posterior 

 half of the external surface is finely striated. 



Cryptophialus cordylacis, new species 



Figure 30 



Diagnosis: Cryptophialus with aperture armed with three pairs of 

 protuberances each equipped with many sharp-pointed spines. 

 Lateral bars terminate in a horny ridge armed with claw-like teeth. 

 Several heavy teeth with up to seven points are distributed ventrally 

 on the mantle. Three pairs of terminal cirri are present. 



Etymology: Cordyl- (Gr.), a headdress, + acis (Gr.), a point, 

 because of the pointed spines forming a "headdress." 



