﻿COriiPODA 



187 



tively long anteniuilae and comixaratively short vSe 2 there is reason to suggest that the vahie of these 

 cliaracters ought not to be exaggerated. 



57. Euchaete acuta CHesbrecht. 

 (PI. VI figs 12 a — c; text-figs 56 a— b.) 



1S92. EucIuEte acuta n. sp. Giesbrecht, p. 246, Taf. i6 and 37. | 1905. Kuclia-tt- acuta Giesbr. Ksterly, p. 157 fig. 23. 



1S9S. 

 1903- 

 1903- 

 1904. 

 1904. 

 1905. 

 1905. 



Giesbr. Giesbrecht & Schmeil, p. 38. ] 1906. 



— J. C. Thompson, p. iS. ' 190S. 



— J. C. Thompson & .\. Scott, p. 244. 190S. 



— Wolfenden, p. iii. 1909- 



Cleve, p. 190. 

 G. O. Sars, p. 4. 

 Farran, p. 35. 



1909. 

 1911. 

 1912. 



Pearson, p. 17. 



Farran, p. 40. 



V. Bremen, p. 51, fig. 56. 



A. Scott, p. 65, pi. XX figs i-g. 



Pesta, p. 23. 



Wolfenden, p. 299. 



Pesta, p. 22. 



Text-fig. 56. Euehiele acuta 



Giesbr. Yc? .St. VI. 



I. .Abdomen ;< tS. b. Pes V 



in anterior \'iew X 33. 



Description, f^*. Size: 4-02 mm.; anterior division (17 1-0-97) = 2-67 mm.; nro.some 1-35 mm. 

 Giesbrecli t's specimen measured 4-1 mm., Farran's 4-4 mm. and vScott's 4-2 mm. 



The genital area has on each .side of the vulva a lamina-shaped process, .somewhat larger on 

 the right side; the outline is, as shown in fig. 12a, somewhat different from Giesbrecht's fig. 47 (Taf. 37). 

 Scott's fig. 4 of the abdomen in dorsal view differs distinctly by the presence 

 of a right lateral process (may possibly be the process on the right side of the 

 vulva, which is \'isible when the animal is not examined in complete dorsal 

 view). The subapical seta is much longer than the St. 2. 



The aiitciniulae. month-limbs and natatory limbs are scarcely different 

 from Giesbrecht's description. 



The epistoma and the anterior surface of the labniin do not show any 

 features of interest. The hairs on the oral surface of the lalirum show a rather 

 simple arrangement. The group i is, as usual, placed somewhat lateralK', but 

 is not distinctly separated from the group 2; the groups 3—4 are small and well 

 marked out; the group 5 is fairly big. The transverse row behind the median spot Xr. 3 is short and 

 narrow. No lateral group was obser\'ed (of. fig. 12 b). The lateral group in frt>nt of the latiiiiia labialis 

 (fig. 12 c) consists of small granules, and is well separated from the median groups; these consist, as 

 shown in fig., of fairly long hairs; the inner group of granides anteriorly was not observed. 



Yci' (St. V). Size: 372 mm.; anterior division 2'6.Sinm. ; urosome 1-04 nmi. 



The lateral corners are rounded. The subapical setae are, as in the adult females, stronger as 

 well as much longer than the St. 2. The laifcviiular extend .scarcely to the end of the anterior division. 

 The appendages are scarcely different. The .structure of iXxc fifth foot is seen in text-figs 56 a — b. 



Occurrence. The species was not gathered b\- the lugolf Exp.; but, as it was found by the Tiior 

 at the following 3 stations, I have included it here. 



'5/6 1905 St. 82 5i°32 L.N. ii°43 ^'-W. Vt. 1200 M. Wire i f?. 



2% 1905 St. 88 48°o9 L. N. 8''30 L. W. Vt. 300 :\I. Wire i.sf?- lycT- 



^'/o 1905 St. 90 47°47 L.N. 8"oo L. W. Vt. 300 i\I. Wire t f$. 



24* 



