CAPRELLIDEA. 



817 



as broad, and the few setae are a little shorter than the joint. The 

 segments of the thorax, from the second to the fifth inclusive, are sub- 

 equal, and the two following are about as long as the preceding one. 

 The third thoracic segment is broader posteriorly, and in some males 

 both this and the following have a low oblong prominence below, as 

 in figure d, and the first pair is but little longer than half the second. 

 The legs of the second pair, in males, are inserted quite near the pos- 

 terior part of the second thoracic segment, and in females near the 

 anterior margin. 



Var. obtusirostris.—Fig. 6 a, b, Plate 54, represents a variety of the 

 preceding, from the same locality. 



Length, half an inch, or nearly so. Colour, dirty yellowish or red- 

 dish. It has a small, obtuse tubercle, which, in a vertical view, pro- 

 jects upon the head between the eyes, and not in front of it. The 

 second, third, fourth, and fifth thoracic segments are subequal in 

 length. The first four joints of the inferior antennae are about equal 

 to basal portion of superior, and the remaining portion is slightly 

 longer than the preceding joint, or about half the flagellum of the 

 superior pair. Hand of first pair of legs about two-thirds as long as 

 hand of second pair. Spine near base of tarsus of posterior six legs 

 on lower side very slender ; outer apex of first joint of these legs not 

 prolonged. 



The specimen figured had the second pair of legs attached to second 

 segment just anterior to middle, as if it were a female; yet there were 

 no ovarian lamellae. 



Caprella attentjata. 



Corpus gracillimum, segmentis elongatis, 2do thoracis gracili, rnulto lon- 

 giore quam Stium. Caput segmento proximo quadruplo brevius, 

 prope dorsum medium aculeo acuto arrecto armatum. Antennae, lmce 

 dimidio corporis longiores, articulo lmo fere dimidii 2di longitudine, 

 flagello S-10-articulato, duplo breviore quam basis, articulo lmo longo 

 composito. Antennas 2do3 articulos basis lmarum duos basales fere 

 cequantes. Branchice fere lineares. Manus 2da perangusta, fere 



205 



