COLLECTED BY CAPTAIN TOYNBEE. 
179 
ElJCHiETA. 
EUCHiETA ATLANTICA, Lbk. 
Some of these specimens, and also some collected on the 7th October, had spermatic 
tubes attached to their abdomen. One of the latter also carried some eggs. 
Collected March 25th. S. lat. 0° 30' ; W. long. 0° 30'. 
„ February 1. S. lat. 0° 30'; W. long. 0° 30'. 
„ May 14. S. lat. 0° 40' ; W. long. 0° 20'. 
9} 
October 7. N. lat. 7° 15'; W. long. 27° 52'. 
Eucileta Stjtherlandii, Lbk. 
Collected October 7. N. lat. 7° 15' ; W. long. 27° 52' 
Undina. 
UXDINA LONGIPES, Lbk. 
There was only one specimen of this species. The fifth pair of legs did not exactly 
agree with my drawing (I. c. pi. 6. fig. 5), as the terminal part of the long leg was con- 
siderably produced. On referring, however, to the specimen from which my drawing 
was made, I find that it is perfectly correct ; so that probably this organ varies in form. 
Collected October % 1858, in lat. 7° 15' N, long. 27° 52' W. 
Uxdina Darwinii, n. s. Erons rotundatus. Cephalothorax 5-articulatus, superne 
visus subacutus, latere visus rotundatus. Antennae anticae corporis fere longitudine, 
articulo primo elongato, setis brevibus : seta articuli secundi et octavi longiuscula, 
recta ; seta postica apicalis et antica penultima articulo longiores, postica antepenul- 
tima tamen brevior. Pes posticus dexter elongatus, sinister brevis. Abdomen 
5-articulatum. Styli caudales breves ; setae pluniosaj, secundae vix duplo longiores. 
The basal segment of the anterior antennae is long ; probably, however, it consists in 
reality of three true segments. The second, third, and fourth segments have almost 
coalesced, or rather, perhaps, have scarcely separated. The second and eighth (apparent) 
segments bear a rather long straight hair. The posterior penultimate hair is the longest 
of those near the apex (PI. XXIX. fig. 5) . 
The posterior leg of the male is long and rather slender : its form is difficult to describe, 
but is sufficiently indicated in PL XXIX. fig. 4. It consists of five segments, the three 
middle ones subequal and of moderate length. On the outside of the fourth is a Ion- 
slender, twisted and blunt appendage. On the inner side of the second segment is a 
small appendage, which is probably a rudimentary representative of the inner ramus. 
The left W is not half as Ion- as the right ; it is small, and of the ordinary type, with 
3 «o vxxw ^ 
short spines. The abdomen is 5-jointed, the segments gradually, though not very 
larly, decreasing in size. The caudal lamellae are short. The abdomen is ^ooo m length, 
of which the lamellae measure WW" 5 the segments gradually decrease in size. The 
second caudal seta 
2 th°: the others about half as long : but these measures 
cannot be depended on as exact, as the tips may have been broken off. 
Collected January 30, 1858. S. lat. 0° 30' ; W, long. 0° 30\ 
» February 10, 1859. N. lat. 8° 0'; E. long. 77° 0'. 
p L. XXIX. fig. 4. fifth pair of legs of male, x 60 ; 5. end of anterior antenna, x 60. 
