COPEPODA 



133 



The strong and short rostrum (text-fig. 35 a) is directed forwards and downwards. The lateral 

 corner of the thorax is triangularly pointed on the left side and rounded on the right (text-figs 35 b— c). 

 The first abdominal somite is as described by Giesbrecht asymmetric, and possesses on the right 

 side, dorsally, a strong curved spine; on the left side at the posterior margin we find in most specimens 

 two vertical rows of from 4—10 teeth, placed the one above the other; on the right side a more regular 

 row of teeth is observed. The structure of the vulva seems to be rather simple (fig. 3 a). Only in a 

 single specimen was there found on the left side of the third abdominal somite near the hinder margin 

 a structure somewhat like the hairy cumulus, which 



J ' a be 



was figured (Taf. 37 fig. 55) by Giesbrecht. In 

 a single specimen a moderately long slender seta 

 was observed in Re I of the antennae. In the lobe 

 IV of the second basipodite in the maxillipeds no 

 sensory process was observed. The first pair of 

 legs has no Se Re I, but Se Re II extends almost 

 to the base of Se Re III; the articulation between 

 Re I and II is fairly well marked except anteriorly 

 and medially. The lateral margin of Re II has a 

 glandular pore near the base of Se Re II, and that 

 of Re III has one placed near base. The Se Ri I 

 has a well developed accessory tooth in pes II, and 

 a somewhat smaller one in pes IV; the inner margin 

 of the second basipodite is smooth in the fourth 

 pair of legs. Glandular pores were found in Re II 

 and in Re III at the base of Se 3, and in pes III 

 — IV as well in Re I. 



The lateral outline (text-fig. 35 a) of the la- 

 drum is somewhat similar to that of Euchcete. Be- 

 hind the transverse chitinous list, which is placed 

 somewhat behind the insertion of the antennulae, 

 a low hairy elevation is found ; this is separated by 

 a depression from the well raised labrum proper. 



On the said elevation a median group of long setae and on each side lateral ones of short setae are 

 observed. Along the posterior margin of the labrum long setae are placed in the middle, and shorter 

 spine-shaped ones laterally. The oral surface of the labrum is very similar to that of U. major (cf. fig. 2 a), 

 but the number of setae in the first group is somewhat larger. The lamina labialis and the two series 

 of setae in front of it are in the main like fig. 2 b, but the number of setae is larger; the arrange- 

 ment of hairs on the labial lobes and behind is similar to fig. 1 c. 



fo*. Size of specimen from Thor St. 90 was 3-93 mm.; anterior division 2*89; urosome 1-04 mm. 

 A.Scott's specimens measured 3-2 — 3*6 mm. 



The rostrum is straight and directed directly downwards; the head is raised but has no frontal 



Text-fig. 35. Undeuchate minor Giesbr. 

 a. f9. Head X 33- b— c. f$. Left and right lateral corner 

 X 33- d. f O*- Head X 39- e - *d- Abdomen X 39- l f cf- 

 Pes V. Ri sin X 59- g- yd (St. V) Pes V in ant. view X 59- 



