lO' 



the Furci/ia- and Ca/vp^o/>ts-sta.ge.s this keel is extremely conspicuous, twice or less than twice 

 as long as high, with the front margin nearly vertical, the angle rounded, and it is situated at 

 the middle of the carapace or in the younger stages even nearer the posterior than the front 

 end. In these larval stages the eyes are rather large, semiglobular, not oblong, with the eye-stalks 

 rather long and distally thick ; the telson of these larvse differs from those in the corresponding 

 stages of ^ E. pellucida" as given by Sars in various particulars, especially as to the length of 

 the spines. By the development and shape of the eyes and especially by the high and short 

 dorsal keel on the carapace these larvae are easily distinguished from larvae belonging to the 

 E. Kro/inii-grou^ {E. KroJmii Brandt, E. dioincdece Ortm., E. imitica H. J. H., etc.) and from 

 those of the "■ gibba" -'grovi'^ known to me. 



Remarks. — This species is easily distinguished from the numerous other species with 

 a spine on third abdominal segment by the shape and shortness of this spine, by the eyes, the 

 short rostrum, the long sixth abdominal segment and especially by having no leaflet or process 

 on the first and no angle or lamella on the second antennular joint; especially this structure 

 of the antennular peduncles is quite unique. 



Distribution. — In pelagic material from Amboina I found 3 young specimens and 

 gave a preliminary description of the species in the report quoted. I have not seen specimens 

 from any locality outside the Archipelago explored by the "Siboga". 



Pseudeuphausia n. gen. 



Nearly allied to Etiphausia, but differing in the following characters. Carapace produced 

 into a long frontal plate with the broad end transversely cut off, without rostrum; lateral margin 

 with a small tooth near the posterior end. Endopod of fifth pair of thoracic legs in the male 

 somewhat shorter than in Eitphansia, with the sum of the three distal joints scarcely more than 

 half as long as on the fourth pair ; in the female that endopod is only half as long as on 

 the fourth pair, with the third joint a little expanded, third and fourth joints together strongly 

 curved, forming somewhat less than half of a cercle for the reception of the ovisac, while the 

 three terminal joints are extremely short, together only as long as the terminal joint of fourth 

 pair and only half as long as in the male. Copulatory organs (PI. XV, figs, i c and i d) quite 

 aberrant; the inner lobe (//.) with three small spine-shaped processes, the lateral process of the 

 median lobe {Im.) replaced by an extremely large, very oblong, leaf-shaped plate (/^), the 

 auxiliary lobe wanting and the setiferous lobe {/s.) extremely narrow and quite naked. The 

 females carry an oblong-triangular ovisac, rounded anteriorly and posteriorly divided by a median 

 incision, showing that it consists of two ovisacs glued together in front. 



The genus is established on a single species, Etiphausia latifrons G. O. Sars. 



14. Pseudeuphausia latifrons G. O. Sars. PL XV, figs. \a — \d. 



1883. Euphausia latifrons G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, N" 7, p. 19. 

 1885. Euphausia latifrons G. O. Sars, Challenger Rep. Vol. XIII, p. 95; PI. XVI, figs. 17—23. 



Stat. 7. March 1 1. Lat. 7° 5 5 .5 S., long. 1 14° 26' E. 15 m. and more. Shore-exploration, i specimen. 



