COPEPODA 



36. Euchirella bitumida n. sp. 



(PL V figs 9 a g; PL VIII figs 4 a e; text-fig. 34.) 



Description. f$. Size of specimen from Thor St. 82 6-6 mm.; anterior division 5-4; urosome ra. 

 Another specimen measured about 7 mm. 



The head is produced into a prominent rounded helmet-shaped crista (PL VIII fig. 4 a), like 

 that of E. galeata, 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 ; the 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, partly 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 antennulac, which almost extend to the end of the abdomen, have the 

 appendages completely like those of E. messinensis, and the measurements almost alike, 

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

 The antennae. (PL VIII fig. 43) have the endopodite one third as long as the exopodite; 

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

 two inner are rather short. The maxillulae differ from those of E. messinensis by the ~ . fi 



relative length of the setae in L,e; the two first and the fifth one are distinctly Euch.ntumi'dan.sy. 



shorter than the others. The maxillae are, as seen in fig. a d, in main features like , . 



tenor view X 57- 



those of E. messinensis. The maxillipeds have the exterior margin of the third basi- 



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



has only 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 Se of Ri I (fig. 4 c) of 

 the undivided endopodite in the second pair of legs is poorly developed, as seen in fig. 4c, and the 

 Se 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 fourth pair of legs has on the posterior surface of 

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

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

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

 a single spine was observed on the left side, while 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. messinensis with a pore in Re I of pes III IV. 



17* 



