18 University of California Publications. [Zoology 



much stronger in the male and ending in three long, curved, 

 plumose setae; in both sexes the basal joint bears a respiratory 

 plate. Last pair of feet short, indistinctly jointed, and bearing 

 two terminal setae, one of which is very long, the other short. 



The furca consists of two laminae pressed together, each of 

 which bears a series of curved spines or ungues on the posterior 

 margin and a single long, slender spine on the anterior margin. 

 Copulatory organ of the male single and situated on the left side. 



1. Conchoecia spinirostris Claus. 



PI. Ill, figs. 4-7. 



1874. Conchopcia spinirostris, Claus, p. 6, pi. I, figs. 1, 6a, 8; pi. II, figs. 



11, 14, 15. 

 1887. Conchoecia pellucida, Sars, p. SO, pi. XI, figs. 1-4; pi. XII; PI. XII f, 



figs. 1-4. 

 1891. Conchoecia spinirostris, Claus, p. 56, pi. I, figs. 1-12. 

 1894. Conchoecia spinirostris, Miiller, G. W., p. 227, pi. VI, figs. 1-9, 13. 

 1896. Conchoecia spinirostris, Brady and Norman, p. 689, pi. LX, fig. 22. 



Shell pellucid, about twice as long as high, with longitudinal 

 markings which are very obscure in preserved specimens; oblong, 

 higher behind than in front in the female; in the male the dorsal 

 and ventral margins are nearly parallel and the posterior margin 

 is straight. Frontal organ of female straight, without a dis- 

 tinctly separated capitulum : shape of outer portion somewhat 

 variable, usually slightly enlarged towards the end; sometimes 

 ending bluntly, sometimes in a sharp-pointed projection ; in male 

 angularly bent, with a club-shaped capitulum which has a blunt 

 end and a very few minute hairs on the basal half. 



Antennule of female indistinctly jointed, rather short, with- 

 out dorsal seta on second joint; sensory setae about half as long 

 as principal seta which is curved and bears small hairs on the 

 dorsal margin of the basal third, and on the ventral margin of 

 the middle third; principal seta of male antennule scarcely 

 longer than the adjacent ones, armed wdth backward directed 

 hooks; the distal eleven or twelve pairs of hooks large, strong, 

 and closely set, followed proximally by ten or twelve much 

 smaller ones which are farther apart; long sensory filament 

 curved backward in opposition to the antennule. 



