﻿COPEPODA 



36. Euchirella bitumida n sp. 



(PI. V figs 9 a— g; PI. VIII fig.s 4 a— e; te.xt-fig. 34.) 



Description, f?. Size of specimen from Tlior vSt. 82 66 mm.; anterior division 5-4; nro.some 1-2. 

 Another specimen measured about 7 mm. 



The head is produced into a prominent rounded hehnet-sliaped crista (PI. VIII fig. 4 a), Hke 

 that of E. galcata, which is well marked off behind, and not continued into a dorsal keel; below the 

 crest the margin falls steeply towards the prominent but rather short rostrum. The body is rather 

 slender, with the head and the first thoracic tergites coalesced; tlie fifth tergite is not distinctly marked 

 out, and the lateral corners are rounded (figs 9 a — b). The anterior division is 4-5 as long as the abdomen. 

 The genital somite has in dorsal view a better marked convexity on the right than on the left side, 

 and possesses, slightly in front of middle on each side, a rounded protuberance, bigger on the right 

 side and with a .shallow impression between the two; the genital somite is in lateral view rather cha- 

 racteristic, parth- on account of the ventral outline which is suddenly produced in front and falls rather 

 smoothly behind; in ventral view it appears rather simple (fig. 9 c). The caudal rami are about as 

 long as wide; the terminal setae, which are somewhat longer than the interior one, 

 are of almost equal length and a little .shorter than the abdomen. 



The aiitciiiiitlac. which almost extend to the end of the abdomen, have the 



appendages completely like those of E. iiicssii/n/sis, and the measurements almost alike, 



except segment 17, which is the longest segment, a little longer than segment 19. 



The antcinntr (PI. VIII fig. 4a) have the eudoi^odite one third as long as the exopodite; 



the endopodite has 6 setae of equal length in the Le and 6 in the Li, of which the 



two inner are rather short. The iiiaxillnlai' differ from those of E. unssiiui/sis bv the ~ ^ ,. 



Text-fig. 34. 



relative length of the setae in Le; the two first and the fifth one are distinctly Euch.dituwija n.s'p. 



shorter than the others. The iiiaxillac arc, as seen in fig. q d, in main features like . .' 



' .-5^1 tenor view X 57- 



those of /:. iitcssiiiciisis. The )iiaxillipcJs have the exterior margin of the third basi- 



podite, which is 1-3 as long as Basip. I cvH and about twice as long as Ri, somewhat sinuated; the Ri II 



has onl}' 3 setae. 



The first pair of legs (fig. 4 b) has a small pore in the almost straight margin of Re II, and 

 a very indistinct one placed near the base on the outer margin of Re III. The vSe of Ri I (fig. 4 c) of 

 the undivided endopodite in the second pair of legs is poorly developed, as seen in fig. .\ c, and the 

 vSe of Re II extends slightly beyond base of Se i Re III. The accessory tooth of .Se Ri I is only in- 

 dicated in the third pair of legs (fig. 4 d). The /oxrtli pair of legs has on the posterior surface of 

 the second ba.sipodite in the type specimen on the left side a single straight, fairly strong spine, which 

 almost extends to the base of the third ba.sipodite, and on the right side is substituted for by 3 more 

 slender spines (fig. 4e); in another specimen the spine was wanting on the right side; in a third specimen 

 a single spine was observed on the left side, v.hile none was observed on the right side (perhaps 

 broken?); in two specimens a single spine was observed on both sides, and in a .single one a .spine 

 on the left and one on the right side. 



The number of glandular pores is like that of E. tnessineusis with a pore in Re I of pes III — IV. 



17* 



