AMl'IIIPODA OF SOUTHERN NEW ENGLAND. 



475 



Length, about 15 mm. 



Extensively distributed in the Arctic regions; Norway; British Isles; Iceland; Greenland; Labra- 

 dor; New England. Often taken in considerable numbers near Woods Hole. Ranges iron, •_'() to over 



600 fathoms. 



The eyes, which are pale in alcoholic specimens, contain in life a bright red pigment. 



LYSIANOPSIS Holmes, new genus. 



Antenna- short and differing little in the two sexes; mandibles edentate, furnished with a three- 

 jointed palp behind the middle, and a small molar process nearer the cutting edge than the base of 

 palp first maxilla; with narrow inner plate furnished with two apical seta-; palp two-jointed; maxilh- 

 peds with inner plate narrow an.l extending beyond middle of outer one; outer plate oval, the inner 

 mar-in devoid of spines; palp narrow; anterior gnathopods rather stout, simple; second gnathopods 

 slender; propodus short, setose, with a minute dactyl near middle of distal margin; postero-lateral 

 an°-le of third abdominal segment rounded; uropods normal; telson entire. 



* This crenus is closely allied to LydaneUa, but differs from it in not having the penultimate joint of 

 the second antenna: expanded, in having the first gnathopods simple instead of subchelate, and in 

 having the outer ramus of the terminal uropods consisting of a single joint. 



Lysianopsis alba Holmes, new species. 



Lateral corners of the head produced into a triangular subacute lobe; first antenna- short, first 

 basal joint stout, longer than the next two; flagellum a little longer than the peduncle and composed 

 of about ten joints; secondary flagellum about half length of primary one and composed of about tour 

 joints; second antenna, about as long as first; flagellum about as long as peduncle; mandibles each 

 with a small molar tubercle; palp joined a little behind middle; first maxilte with the inner plate 

 narrow and furnished with two setae at the apex; second maxilla? setose at the tip and ciliated on 



Lysianopsis a2oa. 



Eel Pond, W 1» Hole, Mass. ep„ Side plate of third, abdominal segment. 



the inner margins Inner plate of the maxillipeds furnished with plumose seta- on the inner margin 

 and armed with a lew short teeth at the tip; outer plate devoid of spines or seta? and serrated or cren- 

 ulated on the inner margin; first gnathopods stout; propodus tapering distally to the rather stout 

 dactyl- second gnathopods with the propodus subconlate; the three posterior perseopods increasing 

 rapidly in length posteriorly, the last pair quite long and slender and having the poster.,..' margin of 

 the basal joint serrated; similar serrations on the two preceding pairs, but less pronounced; fourth 

 abdominal segment slightlv indented on dorsal side; first uropods extending backward farther than 

 second and "these exceeding the third; peduncle of terminal uropods very stout, longer than the 

 styliform rami and produced into a triangular projection at distal end of upper margin; telson oblong, 

 entire, distally rounded. 



