504 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



near its anterior end at a level near the anterior limit of the body spina- 

 tion. Lemnisci very long, at times more than three times the length of 

 the receptacle, one usually considerably longer than the other. A small 

 rounded papilla (figs. 2 and 3) 20 to 23 [j. in diameter on each lateral 

 surface of the proboscis, slightly anterior to the level of the posteriormost 

 hooks lying between adjacent longitudinal rows of hooks and slightly 

 modifying the hook arrangement. 



Testes ovoid, about 0.3 mm long, in some individuals contiguous 

 but more often separated by a distance equal to 1.5 times the length 

 of a testis. Cement glands 4, very long, tubular. Genital orifice of female 

 usually slightly dorsal, subterminal, associated with a slight posterodorsal 

 extension of the body. Embryos not available. 



Comparisons. G. lepidus differs from G. medius in that the former 

 has fewer longitudinal rows of hooks as well as fewer hooks in each row, 

 but the hooks are distinctly larger than in G. medius. Comparing G. 

 lepidus with G. clavatus, which is described in this same paper, the 

 latter has conspicuously fewer hooks in each longitudinal row, and 

 the hooks are distinctly larger than in G. lepidus. 



Gorgorhynchus clavatus, new species 

 (Plate 52, figs. 6, 7; Plate 54, fig. 16) 



Host: Paralabrax humeralis, Tagus Cove, Albemarle Island, Gala- 

 pagos, January 13, 1934. 



Types. Description based on 5 individuals and a few additional 

 fragments. Holotype female (VC 3127.1) and allotype male (VC 

 3127.5) in the Allan Hancock Foundation of The University of 

 Southern California. Paratypes in the collection of H. J. Van Cleave, 

 Urbana, Illinois, and in the U.S. National Museum. 



Specific diagnosis. Mature females about 26 mm long, body veiy 

 heavy, 1.8 to 2.4 mm in greatest diameter, tapering gradually to 1.5 to 1.8 

 mm posteriorly. (Males, body broken; hence, entire length not observ- 

 able.) 



Body spines arranged in a single field, extending almost as far 

 posteriorly on dorsal as on ventral surface; ventrally one half to three 

 fifths the length of the receptacle; dorsally one fourth to two fifths the 

 length of the receptacle. Body spines 48 to 84 /x long. 



Proboscis cylindrical, reduced by slight rounding at either extremity, 

 1.25 to 1.5 mm long by 0.51 to 0.58 mm in maximum diameter; armed 

 with 20 longitudinal rows of 13 to 15 hooks each. Longest hooks, near 



