82 



above and one below ; in the immediate region of the posterior 

 border the surface is oblique. The posterior notch is deep ; 

 the median process does not reach the lateral projections. 

 These are acute, and have an oblique direction, while the 

 median process is more horizontal in direction. Another small 

 acute projection is higher up on each side, and higher still 

 a third on each side is faintly indicated ; thus there are six 

 notches corresponding in a degree with those of the preceding 

 species. 



The first antennular joint is rather short, convex ex- 

 ternally, not distally notched ; but the posterior angle is sub- 

 acute and projects slightly. The second joint is about half 

 as long as the first, the third joint is longer than the second, 

 and the flagellum has 10 joints. 



The last joint of the peduncle of the antenna is longer 

 than the one preceding it : its flagellum also has 10 joints. 



The mandibles have the incisory processes oblique and 

 entire. A secondary plate on the left mandible is also nearly 

 entire; spine rows and molars are well developed. 

 Maxillae strongly spined. 



The legs are provided with spines, and the furry pads 

 are absent. In the first gnathopods, which are more robust, 

 the anterior side of the ischium projects as a prominent angle 

 about the middle; the dactylus is large, and about as long 

 as the propodus. 



The sternal filaments are rather long. 

 The external ramus of the fifth pleopod has a distal 

 thickening, which probably represents two lobes, and one on 

 the inner margin distally from the division line, with one 

 on the proximal part just below this. Below this is another 

 slight lobe, some distance down. The outer margin bean* 

 small setae. 



The external ramus of the uropods is smaller than the 

 inner ; it has an oblique upward direction, and is apically 

 acute. There is an acute process on the inner side, another 

 on the upper surface near the outer angle, and a small one 

 on the outer angle itself. The inner ramus has a strong 

 obtuse projection on the outer side, with another one behind 

 it, and one on the inner side ; the apex is obtuse. 



The specimen I take to be the female of this species 

 is much less nodular. The median process of the posterior 

 notch of the abdomen projects considerably as a slightly 

 tridentate process. The channel is deep. There are no rows 

 of spines on the thoracic segments, and the anterior portion 

 of the abdomen has no process. 



The mouth parts are modified. 



Gulf St. Vincent. Two male and one female specimens. 



