154 



The exopod of the second pleopod has 21 teeth. 



The exopod of the third pleopod with a division and 10^ 

 teetli. 



The exopod of fifth pleopod with two lobes on the distal 

 portion, and two on the inner margin, near the middle of 

 the lamina. 



The legs in both sexes are provided with the furry pads 

 so common in this group. 



The female is more convex than the male, with a more 

 ovate outline. The posterior portion of the pleon is more 

 dome-shaped, the small median tubercle less marked, and 

 this portion is less hairy. The posterior notch is simple, 

 narrow, rather deep, cut nearly vertically, U-shaped. The 

 uropods are similar in shape to those of the male, but smaller- 

 The legs are less, robust, and the teeth on the pleopods 

 smaller. 



The eggs I have found deep in the body, quite to the 

 dorsal surface, and the usual modifications of the mouth 

 parts and viscera occur. 



Circeis trilobata, n. sp. 



Plate viii., figs. 17 to 20; and plate ix., figs. 1 to 7. 



The body of the male narrows anteriorly, as seen in 

 other species of this genus; it is smooth — except on the pos- 

 terior portion of the pleon, where there are a few small 

 granules — and glabrous. 



The head is longer than the first thoracic segment and 

 narrower, with a very small depressed rostral projection. 



The eyes are large, and slightly projecting. 



The first segment of the thorax and the seventh are 

 subequal in length, and are longer than the remaining seg- 

 ments. The epimeral plates are marked off from their re- 

 spective segments by faint longitudinal grooves; the antero- 

 lateral angle of the first segment projects forward very much,, 

 but not much posteriorly ; the succeeding plates project be- 

 hind each in a slightly increasing degree, except the last, 

 which also is not so deep. 



The anterior portion of the pleon is subequal in length 

 to the seventh thoracic segment, and it is slightly raised in 

 the middle. The posterior portion bears three bosses, the 

 median one of which is somewhat triangular and abrupt be- 

 hind, the lateral ones less so ; behind these is a semicircular 

 depression, but the immediate region of the posterior notch 

 is tumid. The notch is simple, cut nearly vertical, quad- 

 rate, with a convex base, but no real process. 



The epistome is long, anteriorly appearing thickened, 

 but actually slightly turned upward at the tip, occupying 



