Chilton.' — On some Subterfanean Crustacea. 177 



AMPHIPODA. 

 Genus Crangonyx. 

 (Brit. Mus. Cat. Amphip. Crust., p. 178). 

 Crangonyx compactus, sp. nov. Plate X., figs. 13 to 19. 



Eyes not visible. Upper antenna rather more than one-fourth the 

 length of the body ; peduncle with the first joint longer than the second, 

 and the second longer than the third ; flagellum rather longer than the 

 peduncle ; secondary appendage small and slender, consisting of one long 

 and one short joint. Peduncle of lower antenna longer than that of the 

 upper, the " olfactory denticle" large and prominent, last two joints of the 

 peduncle equal in length, with their posterior edges fringed with several 

 tufts of sets ; flagellum short, rather more than half the length of the last 

 joint of the peduncle. Appendage of the mandible with three joints 

 increasing in length distally, the last bearing several long set®. Gnatho- 

 poda subequal, propodos only slightly broader than the carpus, palm about 

 one half the length of its inferior edge, defined by a stout spine on each 

 side. Pereiopoda subequal. Pleon having the inferior edge of the three 

 anterior segments furnished with five or six small setae. Three posterior 

 pairs of pleopoda short and broad ; first two biramous, third unibranched, 

 the branch longer than the peduncle and composed of one rather long joint 

 followed by a very small one, Telson half as long as the posterior pair of 

 pleopoda, narrowing slightly towards the extremity which bears two short 

 stout spines. Colour — transparent. 



Length, -3 of an inch. 



Hab. Pump at Eyreton. 



This species is readily recognized by the short stumpy appearance of the 

 three posterior pairs of pleopoda. The secondary appendage on the upper 

 antenna is small and very easily overlooked. On the flagellum of the upper 

 antenna there are some " sensory sets." These are small and cylindrical, 

 not quite as long as the joint they are on, and they are divided by a trans- 

 verse septum about the middle. On the basal portion of the flagellum 

 there are two of these setae on each joint, but towards the distal end there 

 is only one on each joint. 



This species is rather rare. 



Genus Calliope. 

 (Brit. Mus., Cat. Amphip. Crust., p. 148.) 

 Calliope subtetranea, sp. nov. Plate IX., figs. 1 to 10. 



Female. — Cephalon without a rostrum. Eyes absent. Upper antenna 

 longer than the lower, about two-thirds the length of the body. The 

 joints of the peduncle decreasing in length and breadth distally. There 



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