86 THE VOYAGE OF H.M.S. CHALLENGER. 



primary branch of posterior antenna three-jointed ; secondary branch small, indistinctly 

 four-jointed ; mandible-palp composed of a moderately large basal joint, and two small 

 branches composed of several joints ; maxillge and foot-jaws nearly as in Pontella. Inner 

 branch of first swimming foot three-jointed, those of the following pairs two-jointed ; 

 fifth pair of feet two-branched. Eyes eoalescent at base of rostrum. 



This genus differs from Calanopia in the structure of the posterior antennae, 

 mandible-palp, first and fifth pairs of feet, .and in the peculiar outgrowth of the abdomen. 

 From Pontella it is separated by the less numerously jointed anterior antennae, and 

 especially bj the characters of the posterior antennas and mandible-palp. But no males 

 having been observed, the generic characters here given must be taken as merely 

 provisional. 



The two species described by Dana as Pontella pulchra and Pontella emerita, would 

 appear to be nearly allied to that here noticed ; but without fuller details it is impossible 

 to say whether they really belong to the proposed new genus. 



1. Pontellopsis villosa,n. sp. (PL XXXV. figs. 14-20, and PI. XXXIV. figs. 10-13). 



Length, l-8th of an inch (3 mm.). Female. — Cephalothorax elongated, cylindrical, 

 posterior angles produced into long, almost straight spines. Anterior antennae (PL 

 XXXV. fig. 15) eighteen-jointed, shorter than the cephalothorax, seventh and eighth 

 joints eoalescent and slightly swollen at the apex, all the joints bearing apical and mar- 

 ginal setse of moderate length. Primary branch of the posterior antenna (PL XXXIV. 

 fig. 10) three-jointed (sometimes indistinctly so) ; secondary branch very short, four- 

 jointed, the two apical joints very small. The mandible is stoutly toothed and clothed 

 with fine hairs toward the apex ; palp two-branched, one branch composed of two, the 

 other of five joints. Inner branch of the first swimming foot (PL XXXV. fig. 17) three- 

 jointed, all the marginal spines of its outer branch very long and slender. The second, 

 third, and fourth feet have two-jointed inner branches (fig. 18), the marginal spines of 

 the outer branches ciliated, those of the first and second joints very long. Fifth pair 

 of feet (female) two-branched (fig. 19), each branch consisting of a single joint, the inner 

 very short, with furcate apex, the outer very much longer, bearing several spine-like 

 setae, three at the apex and two or three on the sides. Abdomen (fig. 20) two-jointed (?), 

 produced at the distal extremity of the left side into a curious cushion-like villous protuber- 

 ance, with a few terminal spines ; caudal segments about twice as long as broad, setae 

 subequal ; integument of the abdomen clothed with short hairs. 



Habitat.— Lat. 30° 22' N., long. 154° 56' W. (Station 256) ; Atlantic between lats. 

 37° and 38° S., and long. 45° to 48° W. 



Three specimens only were found in these gatherings, all females. 



