116 Kev. T. R. R. Stebbingorc Gastrosaccus spiniferus. 



second is long, rather stout and sinuous, set on the outer edge 

 with straight cilia. The third joint is three quarters the length 

 of the second, much thinner, straight, set with numerous 

 feathered cilia on the outer edge, and with three or four on 

 the inner; at the apex a curved cilium projects forward; 

 from this the margin is obliquely truncate on the outer side, 

 and set round with small backward-curved spines close toge- 

 ther, from the midst of which group runs out another spine 

 twice the length of its companions, with its principal curve 

 directed forwards, and having at the back of this curve a 

 little brush of hairs. 



The number of joints in the so-called tarsus of the pereio- 

 pods varies from eight to twelve ; they are ornamented with 

 long plumose setse ; there is also a small thorn at the extre- 

 mity of each joint. In some at least, perhaps in all, of these 

 limbs there is a thorn on each side of the extremity of each 

 joint. There appears to be also a minute rudiment of a finger, 

 or a rudimentary joint additional to the numbers mentioned. 

 The swimming-palps are furnished with very long, highly 

 plumose seta3 ; the flat broad basal joint on the anterior side 

 runs out into a rounded lobe. 



The pleopods in the female, which alone is here described, 

 resemble those in the cognate species ; the first pair have 

 the shape which Mr. Norman has compared to that of a 

 thigh-bone. Some three or four plumose setse stand out near 

 the somewhat dilated end of the peduncle. The rami are 

 both small, the inner with three or four setee, the outer 

 (which is shorter and more pointed) with one or two. 



The telson is about as long as the sixth segment, its breadth 

 at the base more than a third of its length ; it becomes nar- 

 rower towards the distal end, which has a narrow deep inci- 

 sion, the curving sides and curved apex of which are set round 

 with fine spines close together, decreasing as they run up 

 the incision. There are eight thorns on each side of the telson, 

 all more or less curved, the pair at the base standing out at a 

 considerable angle, the last and penultimate pairs, both of which 

 are large and long, being directed backwards in a line with 

 the margin. 



The inner laminae of the uropods are broadly lanceolate, 

 reaching nearly as far as the tips of the terminal spines of the 

 telson ; they are densely fringed with long plumose setee on 

 both margins ; there are also ten spines on the underside — a 

 long and a short one on the swollen part at the base contain- 

 ing the round otolith, the other eight on the inner edge, the 

 third from the base shorter and a little further from the edge 

 than the rest. 



