The Amphipoda of Bermuda. 61 



third joint broader than long; fourth rectangular, about twice as 

 long as broad with posterior margin prolonged to form slender tri- 

 angular process ; wrist triangular, about as broad as long with several 

 fascicles of setae on posterior margin and several very long setae 

 on distal margin, scarcely as broad as hand which is oval and 

 broader distally than proximally and about twice as long as greatest 

 breadth, palm coarsely dentate, rather oblique and about as long as 

 posterior margin into which it passes by a small triangular process 

 and in which region it is furnished with 5 prehensile spines, rest 

 of palm provided with stout odontoid spines and a few slender setae, 

 posterior margin provided with 7 fascicles of setae, anterior sub- 

 margin with several more fascicles, apex with fascicle of rather long 

 setae ; finger of usual form, rather large. 



Pereiopods with epimera of moderate size and with dactyls of 

 usual type, last 3 pairs stouter than first 2, fourth and fifth of nearly 

 equal size. 



Posterior margins of first 3 abdominal segments serrated and pro- 

 vided with short setae, posterior margin of third segment with a rounded 

 notch close to postero-lateral angle which thus is rendered very acute. 



Third uropods and telson were missing in the single specimen at 

 hand ; first and second uropods biramous, with rami subequal, ped- 

 uncle of first extending as far posteriorly as peduncle of second but 

 rami slightly farther than those of second, peduncle of first slightly 

 longer than rami. 



Length of single female exclusive of last abdominal segment and 

 telson 8 mm. 



Insula gen. nov. 



Body compressed, epimera moderate. 



Antennae short, with few segments in flagella, first antennae 

 nearly as long as second and with no accessory flagellum. 



Mandibles with denticulate cutting edge and very large molar 

 tul)ercle, no palp. First maxillae with inner plate provided with 2 

 terminal setae and with small, one-jointed palp. Second maxillae 

 normal. Maxillipeds with inner plates armed apically with 3 acute 

 processes, outer plate small, palp 3-jointed, stout. 



Gnathopods subchelate and equal. Pereiopods normal, no spinn- 

 ing glands; last pair not differing markedly from preceding. 



Uropods 3 pairs, terminal pair small and uniramous. Telson small, 

 thick, entire. 



This genus resembles Orcliestia but is markedly difterent in the 

 greater relative lenofth of the first antennae. 



