CRUSTACEA MAI.ACOSTRACA. IV. 25 



I,ength of the ovigerous female 5.1 mm. 



Remarks. The striking difference in the length of the rami of the nropods between E. trnucatala 

 and E. arctica makes it necessary to establish the latter species. 



Occurrence. Not taken by the "Ingolf", but by the Unci Amdrup-Expedition at a single place. 

 East Greenland: Cape Dalton, ab. Lat. 69°3o' N., 9 — 11 fath., July 20, 1900; 2 specimens. 



20. Eudorella parvula n. sp. 

 (PI. I, fig. 10a; PI. II, figs, ia— if.) 



Female (and subadult Male). Closely allied to E. truncatula, but much smaller and showing 

 a few minor differences. Carapace nearly as in E. truncatula; the antennal notch in the females (figs, ia — ic) 

 somewhat short but rather deep and without teeth on the margins ; below the notch the margin has 2 teeth 

 of which at least the lower tooth is somewhat large; the margin of the interruption below these is in the 

 females scarcely ever concave or straight, but has an angular protuberance which varies much in size and 

 most frequently is low. The lower margin of the carapace is. anteriorly curved much upwards, so that the 

 tooth limiting the interruption is directed a little upwards and in reality situated on the front margin, while 

 the next tooth is placed between the anterior and the lower margin, and these two teeth are uncommonly large. 

 The front margin of the subadult male differs as usual materially from that in the female and is shown in fig. 

 1 f, but a description is scarcely needed. 



In the antennulae (fig. 1 a) the outer flagellum is not inconsiderably longer than the terminal joint 

 of the peduncle. First pair of legs (fig. 1 d) afford a character between this species and E. truncatula, as the 

 propodus is at most one-fourth as long again as, and frequently only a little or slightly longer than, the carpus, 

 and distinctly less than twice as long as the dactylus, while in E. truncatula it is more elongated, being one- 

 third as long again as the carpus and at least twice as long as the dactylus. Second pair of legs (fig. 1 e) nearly 

 as in E. truncatula, though less robust; merus and carpus similar in length. — Uropods (fig. 10 a) in the female 

 with a lower number of spines than in E. truncatula ; the peduncle a little shorter than the endopod, with about 



4 spines along the inner margin; first joint of the endopod not quite three times as long as the second, with 



5 or 6 spines on the margin, while second joint has only a single spine or two spines on the inner margin, a 

 long and very thick terminal spine and an exceedingly long terminal seta; the exopod has a couple of sets 

 on the upper surface. In the subadult male the first joint of the endopod has 8 spines. 



Length of the adult females 3.4 — 3.7 mm. 



Remarks. Whether this species can be maintained as valid or may better be considered only 

 as a variety of E. truncatula must be decided by a future investigator possessing a very large material from 

 numerous localities. I am apt to consider it as a valid species, as I have a large material exclusively from rather 

 deep stations in the Davis Strait, while not a single specimen of the much larger form E. truncatula has been 

 found in any part of the "Ingolf" area. And the animals of E. parvula arc very uniform as to size and features. 



According to Sars E. truncatula goes to the Lofoten Islands, and he did not find it at Finmark. As 

 Norman records it from East Finmark, his specimens ought to be carefully re-examined ; besides I doubt 



The rngolf-Expedition III 6. 4 



