146 COPEPODA 



sess 4 ~i~ 5 4~ 7 S tae as in Ch. Streetsii. The exopodite has n setae, of which the median ones are 

 comparatively short, but not in so marked a degree as in Undeuchate. The Le has 9 setae (according 

 to Farran 8 only), of which the third and the ninth are somewhat shorter than the Set. 4 8, and 

 the first and second are much shorter. The maxillae are very much like those of Ch. abyssalis, cf. fig. 5 c, 

 and have the hairs on the posterior surface of the four lobes arranged in a similar way. The maxilli- 

 peds are very similar to those of Ch. Streetsii, but have no lamina along the outer margin of the 

 second basipodite, nor the anterior process of the second basipodite; the third basipodite is 1-5 as long 

 as the first and second, and 3-8 as long as the endopodite. 



The first pair of legs has the articulation between Re I and II represented by a fairly distinct 

 chitinous line, which is almost wanting posteriorly; the Se Re I extends beyond the end of Re II, 

 and the Se Re II extends just to the end of Re III. The second pair of legs has indication of 

 articular membrane between the Ri I II, but has no accessory tooth at the base of the blunt Se Ri I; 

 the terminal spine has 70 serrations. The Se of Ri I is pointed, but is without accessory teeth in the 

 two last pair of legs ; the second basipodite of the fourlh foot bears on the hinder surface of a process 

 projecting from the inner margin a transverse row of 8 n strong, fairly long spines, of which the 

 inner are somewhat more slender. 



The lateral outline of the labrum is like that of Ch. Streetsii, with well raised, smooth, anterior 

 elevation, and so is the oral surface of the labrum (fig. 6d); the only difference of importance is found 

 in the much longer first group, the almost wanting lateral row in the second group, and the much 

 better developed transverse row of short hairs in front of the transverse chitinous bar. The lamina labialis 

 and the area in front of it are scarcely different from those of Ch. Streetsii, while the arrangement of 

 hairs upon and behind the labial lobes is like that of Ch. abyssalis (fig. 51); a tuft of about 20 long 

 slender setae is found on the lateral surface of the labial lobe, just as in Ch. notacantha. 



Occurrence. The S/S Thor has gathered this species at two stations. 



"/ 7 1904 St. 183 6i30 L. N. I7o8 I v . W. Yt. 1800 M. Wire 17 f? (5 with sp.). 

 IO / 7 1904 St. 180 6i34 L. N. i903 L. W. Yt. 400 M. Wire i f? (with sp.). 



Distribution. This species has been recorded from two stations between 700 and 1000 fathoms 

 off the west coast of Ireland; the Monaco Expedition has gathered it at three stations. 



Remarks. The only difference found between my specimens and Sars' description, which is 

 rather insufficient, is found in the comparatively shorter "antennes anterieurs depassant la longueur 

 de la division anterieure du corps". The Basp. II of pes IV has 6 for n spines. The unimportant dif- 

 ferences from Farran's description are enumerated in the description. Farran has referred the species 

 to Euchirella, probably on account of the well developed spines in the second basipodite of the fourth 

 pair of legs, but it differs in a number of more important characters, viz: the structure of the oral 

 surface of the labrum, the wanting glandular pore of the base of Se i Re III pes II IV, the compara- 

 tively long Ri of the antennae, the position of the spines on posterior surface of lobes I IV of maxillae, 

 and the arrangement of the setae of the maxillulae. In all these characters it agrees with Chirudina as 

 well as, though in a less degree, with Undeuchate. It agrees with Undeuchate in the comparatively 

 short median setae of the Re of the maxillulae, but with Chirudina in the number of setae in Li 2 and 



