COPEPODA 



"3 



31. Euchirella rostrata Claus. 

 (PL IV figs 1 a— h; text-figs 29 a — k). ! 



1866. Undina rostrata n. sp. Claus, p. n, taf. I fig. 2. 



1883.? Euchaete hessii n. sp. Brad}', p. 63, pi. XX figs 1— 13. 



1892. Euchirella rostrata Claus. Giesbrecht, p. 232, taf. 15. 

 1898. — — — Giesbrecht & Schmeil, p. 36. 



1900.? — — — Cleve, p. 4, pi. 2 figs 1 — 12. 



1902. ? — Wolfenden, p. 367. 



1903. Nee. — — Thompson & Scott, p. 244. 

 1903. — Norman, p. 137. 



1903. — — J. C. Thompson, p. 18. 



1904. — — — Wolfenden, p. 129. 



i9°5 

 i9°5 

 i9°5 

 i9°5 

 i9°5 

 1906 

 1908 

 1908 

 1911 

 1912 



Euchirella rostrata Claus. G. O.Sars, p. 4. 



— — Th. Scott, p. 223. 



— Esterly, pp. 152—153. 

 Nee. — — var. magna Wolfenden, p. 18. 



— — Farran, p. 36. 



— Pearson, p. 15. 



— Farran, p. 38. 



— v. Bremen, p. 47, fig. 52. 



— Wolfenden, p. 235. 



— Esterly, p. 311. 



Description. f$. Size: Specimen from Ingolf St. 19 measured 4-07 mm. ; anterior division 3 - 26; 

 urosome o - 8i mm. The size of specimens from other stations varied from 3-25 — 4/2 mm. Giesbrecht's 

 specimens measured 2-95— 3-1 mm., Farrans 3-3 — 4-2 and Wolfendens from 2— 3 mm. 



Re sin. 



Text-fig. 29. Euchirella rostrata Claus. 



a. fO. Abdomen X 45- b. ftf. Rostrum X 45- c. f d 1 . Abdomen X 45- d- f d- Tips of pes V from the right X 15°- 



e. yc ? (St. V). Abdomen X 45- f. yd (St. V) Pes V X 60. g. y d (St. IV) Pes V X 60. h. fO. Body X 33- 



i_j. yo-tf (St. V) X 33- k. f c? X 33- 



The long and pointed rostrum is more vertical and the head is much more suddenly raised 

 than seen in Giesbrecht's fig. 23 (Taf. 36) (text-fig. 29 h). The genital somite has the ventral pro- 

 tuberance more regularly raised, especially behind, than shown in Giesbrecht's fig. 17 (text-fig. 29a). 



The antennulae differ from Giesbrecht's description by the comparatively longer segment 

 2, which is almost as long as segments 8^9. The maxilhilae differ from Giesbrecht's description 

 (fig. 28) by one instead of 2 delicate Sa in Li 2, and by the presence of a posterior process bearing two 

 rudimentary setae (?) on the Li 3 in addition to the two well developed Sa. The sensory conical process 

 of Lob. IV of the second basipodite of the maxillipeds is rather small. 



The pes I is completely like Giesbrech's fig. 11 (Taf. 15); the Re III has a minute pore in 

 the outer margin, somewhat posteriorly, and nearer the base than the tip. The pes II, which has 22 teeth 

 in the terminal setae, has the systems of glands of the Re well developed, in a similar way as figured 



The Ingolf-Expedition. III. 4. 



15 



