COLLECTED BY CAPTAIN TOYNBEE. 179 



EUCH^TA. 

 EUCH^TA 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'. 



„ October 7. N. lat. 7° 15'; W. long. 27° 52'. 



EUCH^TA SUTHEULANDII, Lbk. 



Collected October 7- N. lat. 7° 15' ; W. long. 27° 52'. 



Undina. 

 Undina 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 7, 1858, in lat. 7° 15' N, long. 27° 52' W. 



Undina Dabwinii, n. s. Erons rotundatus. Cephalothorax 5-articulatus, superne 



visus subacutus, latere visus rotundatus. Antennae anticse 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 brevier. Pes posticus dexter elongatus, sinister brevis. Abdomen 



5-articulatum. Styli caudales breves ; seta3 plumosse, secundce 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 descrilje, 

 but is sufiiciently indicated in PI. XXIX. fig. 4. It consists of five segments, the three 

 middle ones subequal and of moderate length. On the otitside of the fourth is a long, 

 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 leg is not half as long as the right ; it is smaU, and of the ordinary type, with 

 short spines. The abdomen is 5-jointed, the segments gradually, though not very regu- 

 larly, decreasing in size. The caudal lamellae are short. The abdomen is g-oifo" ^^ length, 

 of which the lamellae measure awo"; the segments gradually decrease in size. The 

 second caudal seta is -2^0" i^i length ; 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'. 

 Pl. XXIX. fig. 4. fifth pair of legs of male, x 60 ; 5. end of anterior antenna, x 60. 



