46 University of California Publications in Zoology. [Vol. 6 



Ophiocnida hispida Le Conte. 



Figs. 34, 35. 

 Proe. Acad. N. Sc. Phila., V, p. 318, 1851. 

 Diameter of disc 7 mm. Length of arm about S\-> times 

 diameter of disc. Disc covered with small imbricated scales 

 bearing pointed spines (not shown well in figure). Radial shields 

 close together but not touching, 2-3 times as long as broad. Teeth. 

 No tooth papillae. Three pairs of rounded mouth papillae, inner 

 pair appearing like a split tooth, outer pair broader than the rest. 

 Side mouth shields broad without, narrow within, meeting or 

 nearly meeting within. Mouth shields varying in size, diamond 

 shaped, elongate radially. Genital pores beginning at mouth 

 shield. Two flat tentacle scales. Ventral arm plates rectangular, 

 about 1% times as broad as long, with corners rounded. Dorsal 

 arm plates elliptical, about three times as broad as long. Three 

 arm spines, blunt, flattened, about 1% times as long as arm joint, 

 subequal except on distal end of arm where the dorsal spine is 

 smallest. Color in alcohol, pale yellow, with small fuscous spots 

 on disc and a larger fuscous spot near middle of each radial 

 shield. Arms brown, interrupted with pale yellow with a median 

 discontinuous fuscous line above. Arm spines pale, tinged with 

 In-own. Tentacle scales pale. Mouth parts pale, tinged with 

 fuscous. 



From west coast of Central America to Catalina. Smithsonian: 4100, 

 Catalina, W. H. Dall (c 32). 



Ophiocnida amphacantha sp. now 



Figs. 24, 25. 



Diameter of disc 7% mm. Length of arm about 10 times 

 diameter of disc. Disc covered with imbricated scales, some of 

 which bear large, pointed spines. Radial shields narrow and 

 touching without. Four pairs of mouth papillae on each jaw. 

 besides a pair over the mouth tentacles. Teeth. No tooth pa- 

 pillae. Mouth shield pointed within, outer edge short and 

 straight, edges next the side mouth shields convex, edges next the 

 genital openings concave. Side mouth shields narrowed and 

 touching within. Genital openings beginning very near the 



