472 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxxv. 



LERN^OPODA BICAULICULATA, new species. 

 Plate LXXXII. 



Host and record of specimens. — Three females were taken from 

 the tips of the gill filaments of the Dolly Varden trout, Salvelinus 

 in (d inn. at Bering Island by Governor X. Grebnitzky. They are made 

 the species types and are Cat. No. 38594, U.S.N.M. 



A second lot of two females was obtained by L. Stejneger in 

 1882, also from Bering Island, but the host is not given. This lot 

 is Cat. No. 8453, U.S.N.M. 



A single female was taken from a " trout " at Mapleton, Oregon, 

 by Dr. S. E. Meek in 189G, and is Cat, No. 38575, U.S.N.M. 



Female. — General body form short and stout, and but little flat- 

 tened. Head long and narrow and as wide at the tip as at the base, 

 where the second maxillipeds project on either side like a pair of 

 veritable shoulders. This is markedly different from the other 

 species examined and constitutes a good distinguishing character. 

 In side view the liases of the first maxillipeds are seen to be placed 

 well back, close to the second pair. The latter are nearly as long- 

 as the genital portion, of the same diameter throughout, and squarely 

 truncated at their tips. They are not fused at the tips, but are 

 entirely distinct, and each gives rise to a slender petiole. These 

 two petioles then unite to form the common petiole of the bulla, 

 which has the ordinary mushroom shape. 



The bases of these second maxillipeds are fused across the body 

 and project strongly on either side, their combined diameter being 

 nearly twice that of the head. Behind them the flask-shaped genital 

 portion is narrowed into a neck of about the same diameter as the 

 head, and thus increases the prominence of the projecting maxilli- 

 peds. This genital portion is flattened on the ventral surface and 

 strongly arched dorsally: it is one-half longer than wide and of 

 about t lie same width and thickness, and is entirely without processes, 

 abdomen, or anal laminae. 



The vis<x cases are attached at the extreme ventral corners, as 

 widely separated as possible, constituting another specific character- 

 istic Furthermore, the tube or neck by which each is attached to 

 the body runs some little distance along a groove in the ventral 

 surface of the genital portion, diagonally forward and inward, to 

 the openings of the oviducts. Egg cases four-fifths the entire 

 length of the body and half the diameter of the genital portion. 

 Eggs large and arranged in eight to ten longitudinal rows. 



First antennae slender and more distinctly jointed than in other 

 species, but smooth and unarmed. Second pair flattened and lam- 

 inate, divided at the tip into three parts, something like those of 

 gibber. The two outside parts are rounded knobs covered with short 



