314 CALIFORNIA ACADEMY OF SCIENCES. [Proc 3D Ser. 



some time in dilute formalin I found that its condition for 

 study was much improved and more details were made out 

 than would otherwise have been possible. Having been 

 very briefly described and placed in a wrong genus it 

 would scarcely be possible, except by an examination of 

 the type, for this species to be identified. 



Specimens of Anonyoc nugax from the Arctic seas north 

 of Europe differ in no essential feature from Lockington's 

 type. 



Family AMPHITHOIDvE. 



Amphithoe scitula (Harford). 

 Plate XXXVI, Figs. 21-24. 

 Dexamine scitulus Harford, Proc. Calif. Acad. Sci. v. 7, p. 116, 1877. 



Rostrum absent. Upper antennae nearly as long as the body, the first 

 2 joints of subequal length; third joint about | the length of the second and 

 nearly reaching the middle of the last basal joint of the lower antennae; 

 flagellum much longer than the peduncle and composed of about 70 joints. 

 Lower antennae about | the length of the upper; third joint not longer than 

 wide, but longer than the preceding joints which are very short; last joint of 

 the peduncle about f the length of the preceding one; flagellum but little 

 longer than the peduncle and composed of 26 joints. Mandibles with the 

 molar tubercle prominent; the second joint of the palp narrow, the third 

 joint wider than the second, tapering evenly toward the base, the nearly 

 transverse distal margin furnished with setae. Outer plate of the first 

 maxillae armed with 10 curved teeth; first joint of the palp longer than wide, 

 the second distally widened. Second maxillae with the inner plate narrower 

 than the outer but nearly as long and setose on the entire inner margin. 

 Maxillipeds with the inner plate very small, oblong, distally rounded, not 

 reaching the middle of the first joint of the palp; outer plate moderately 

 wide, reaching beyond the tip of the second joint of the palp, the inner 

 margin armed with about 20 spines; first joint of the palp about half the 

 length of the second, inner margin very short; third joint pyriform; fourth 

 joint slender, tapering, and ending in a claw-like seta. Second, third, and 

 fourth epimera subquadrate and increasing successively in length and 

 breadth. First gnathopods with the elongated first joint produced into a 

 rounded lobe at the antero-distal angle; second joint with an anterior lobe; 

 third joint truncated distally, the postero-distal angle rounded and setose; 

 fourth joint subtriangular, elongated, nearly as long as the hand, and strongly 

 setose posteriorly; hand oblong, slightly widened distally, the palm convex 

 and very oblique. Second gnathopods shorter and stouter than the first, 

 the first joint with a lobe at the infero-distal angle which is similar to but 

 smaller than that of the first pair; second joint with a prominent anterior 

 lobe; third joint similar to that of the first pair, the inferior angle produced 



