u 



4(>4 BULLETIN OF THE BUREAU OF FISHERIES. 



Hyperia galba (.Montagu.) 



Body tumid; antenna- in the female scarcely half a* long as the depth of the head, the first a little 

 longer than the second; in the adult male both antenna- may exceed half the length of body, first gnath- 



opods with carpus produced at the posterc- 

 inferior angle into a triangular pointed lobe; 

 #"< i^^^ 1 a /s- — second gnathopods with carpus produced into 



a narrow triangular lobe at the postero-infe- 

 rior angle extending to or beyond the middle 

 of propodus; peraeopods almost devoid of setse; 

 rami of terminal uropods narrowly ovate- 

 lanceolate; telson triangular-ovate, acute. 

 Hyperia galba, male. After Bars. Length, 15 mm. Arctic specimens may attain 



a length of 20 mm. 

 Arctic regions; Norway; British Isles; France; Greenland; off Cape Breton, Nova Scotia; Grand 

 Manan; Gulf Stream, longitude 110° 9' N., latitude 68° 52' W.; Eastport, Me.; Salem and Woods 

 Hole, Mass. 



Found commonly in Amelia. 



Hyperia medusarum (M idler). 



This species is closely allied to H. galba, but may be distinguished by the following characters: 

 The gnathopods are larger and densely setose on the sides, while in ijn/l,n they have almost no seta- on 

 the surface; the postero-inferior angle of the first gnathopods is not produced, and thatof the second 

 is not produced as far as the middle of the propodus; the posterior margins of the first and second 

 peraeopods are well furnished with seta-. Length, 15 mm. 



Arctic regions; Norway; Greenland; Labrador (Packard); Bass Harbor (on Cyanea). 



Often found in Cyanea and Aurelia. 



It is very probable that this species will be found as far south as Woods Hole, although I have no 

 knowledge of its occurrence south of Cape Cod. Its usual host, Cyanea, is often taken farther south. 

 Professor Smith reports two species of Hyperia from Vineyard Sound. It is quite probable that they 

 were this and the preceding species. 



Hyperoche abyssorum (Boeck). 



Body rounded above, more tumid in the female than in male; second antenna? in female much 

 smaller than first, the latter 'very much shorter than the depth of head; rlagellum of second antenna- 

 not much longer than peduncle; both pairs of antenna- much elongated in male; gnathopods of similar 

 form; carpus in both pairs produced into a long acute lobe which extends below the propodus to or 

 beyond its distal end; first two pera?opods with carpus compressed, the posterior edge acute, dentic- 

 ulated and produced at lower end into a tooth; three posterior peraeopods subequal and not much 

 longer than first two, but with long and slender dactyls and narrower c..: pi; telson triangular-ovate, 

 not leaching the middle of peduneleof terminal uropods. Length, 5-6 mm. Artie specimens, accord- 

 ing to Sara, may attain a length of 15 mm. All of the specimens of this species which I haveexamined 

 are of small size. 



Artie regions; Norway; Greenland; Labrador; Albatross station 2029; Domino Harbor. 



Euthemisto compressa (Goes). 



Body carinated above, the carina on last two segments of thorax and the first two of abdomen 

 produced posteriorly in adults into a tooth. First antenna- in adult female about as long as the head 

 is deep, the tip curved downward; carpus of first gnathopods broad, but not produced at the postero- 

 inferior angle; propodus about as long as carpus and about twice as long as dactyl; second gnathopods 

 with carpus produced below propodus nearly to the tip; dactyl slender, but little over half the length 

 of propodus; carpus of first and second peraeopods expanded, rather narrowly but regularly oval, the 

 posterior margin furnished with several long and stout seta-; propodus narrow, curved, little tapering, 

 'and closing against the carpus, third peraeopods longer and stouter than the posterior two pairs, which 

 reach but little farther than middle of propodus of the former; anterior margin of propodus armed with 

 about ten seta- and minutely pectinated with very short seta-; dactyl over one-fifth the length of pro- 



