148 



The second gnathopods are scarcely twisted, and are a 

 little longer than the following legs. 



The pleopods are rather narrow. The first pair has the 

 endopod much smaller than the exopod, and is about twice 

 as long as broad; the inner margin is straight and slightly 

 thickened; the outer insinuate, with a small turned-up point 

 near the proximal end. There is a "shelf," on which rests 

 the inner margin of the exopod. The exopod is broadly- 

 ovate. Areolate structure is well marked. 



The second pleopods have an elongate endopod nearly 

 t»wice as long as the exopod. The apjjendir masculina is as 

 long as the lamina; on the lamina is a faint '"shelf" on 

 which the appendix rests. The exopod is narrow-ovate, with 

 a much longer fringe than that of the endopod. 



The third pleopods are shorter than the second; in them 

 the exopod is shorter and narrower than the endopod, and 

 has a nearly straight inner margin, and is without division 



The fourth pleopods have both rami branchial. 



The exopod of the fifth pleopods has two lobes at the 

 distal end, and two on the inner margin, one above the other, 

 a short distance; a division is not plain; the external margin 

 is almost devoid of setules. 



The uropods are broadly lamellar, ovate, the inner rami 

 projecting beyond the end of the pleon, the outer project- 

 ing a little beyond the inner. The outer ramus is a little 

 smaller than the inner. 



Gulf St. Vincent, shallow w^ater. One male specimen and 

 two immature. 



Amiyhoroidella, new sub-genus of Anrphoroidea. 

 Amphoroidella elliptica, n. sp 



Plnte vi., figs. 11 to 18. 



The body is ovate, convex in both directions above, con- 

 cave beneath, covered with a kind of skin that can easily be 

 scraped off, the "'skin" thrown into a median dorsal fold or 

 thickening, rendering each segment of the thorax apparently 

 tuberculate in the larger specimens. First and second joints 

 of the antennules, segments of the thorax, anterior and pos- 

 terior divisions of the pleon, with the uropods, much ex- 

 panded, so that only the head and extremity of the pleon are 

 not concerned in the outline. 



Head short, somewhat depressed ; anteriorly there is 

 an insinuation each side of a small rostral projection not more 

 developed than is usual. 



The lateral expansions of the first thoracic segments ap- 

 proach those of the second joints of the antennules; there is. 



