THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA ) 113 



Dimensions: Holotype 1.36 X 0.52 mm in length and width, with 

 aperture of 0.15 mm on a neck of 0.42 mm. Seven paratype specimens 

 from the type-host shell and averaged 1.40 X 0.45 mm, with an 

 aperture of 0.176 mm on a neck of 0.45 mm. 



The distinguishing features of this species are found on the mantle. 

 The operculum armament is almost as awesome as that of C. lanceo- 

 latus, except that the long, hyaline spines are not barbed. 



Figure 29. — Crypiophialus unguiculus, new species: a, female, side view, from Thais aperta 

 from Necker Island, Hawaii; h, opercular horizon, detail of a, left side, sequence from 

 medial to lateral is medium spines, tall, haired spines, and short, serrated teeth; c, man- 

 dible of specimen from Turbo marmoratus from Santa Cruz Island; d, mature male from 

 specimen in c; e, burrow aperture in Turbo lajonkairi from Wake Island. 



On the outer edges of the operculum are two or three pairs of 

 spines with smaller spines and many hairs attached. Between these 

 major spines are hyaline teeth with strongly serrated edges. Medial 

 to these spines and teeth are numerous long, hyaline spines which 

 lack the barbs mentioned above. 



The lateral bars terminate in a massive hillock with four to five 

 teeth recurved anteriorly, giving the general appearance of a bear's 

 claw. An occasional lighter "bear's claw" array of teeth has been 



