100 AMPniPODA NORMAUA. 



Hah. GrccnlaiKl (IfulbuU); dredged in Plynimith Sound (C. S. B.) ; 

 Shetland (Mr. G. Jiarlee); "Grand Manan, U.S., North America, 

 dredged on coai-se sandy bottoms in the Laminarian and Coralline 

 zones " (Stimjjson). 



I have not seen Kriiyer's type of this or the preceding species. In 

 his descriptions, he states that a few spines exist upon the third and 

 fourth articiilations of the peduncle of the inferior paii' of antemiac in 

 P. IlolboUi, and that sucli spines are absent in P. 2)h<mosi(s. In the 

 specimens from which our figure and description are taken, the few 

 hairs upon the inferior antennae in P. HoJbdlli can scarcely be termed 

 spines ; whereas in P. phonosus there are plumose hairs, of which 

 Krciyer makes no special mention. In other respects the animals 

 agree with Kroyer's descriptions, and therefore I do not feel justified 

 in separating them \\\)on such immaterial differences. 



The only distinction between P. plumosus and P. fusiform is, 

 according to Stimpson, consists in the latter having " more nails 

 [spines] on the third and foiuth legs than P. phimosus," Kr. 



Stimpson states the eyes to be white. 



4. Phoxns geniculatus. 



Plioxus geniciUatus, Stimpso)}, Proc. Acad. Nat. Sc. U. S. May and 

 Jime 1855. 



" Rostrum very long, pointed. Eyes white. Superior antennae bifla- 

 geUate ; flagella equal, 10-aiiiculate. Membei's with simple hairs. 

 The meros and carpus of the first and second pairs of pereiopoda 

 dilated ; rami of the posterior caudal stylets unequal, the outer 

 ones long, thi'ee-jointed. Colour white. 



« Length i of an inch. 



" Rab. Japan." — Siiinpson. 



5. Fhoxus obtusus. 



Phoxus obtusus, Stimpson, Proc. Acad. Nat. Sc. XJ. S. Mav and Junt.- 

 1855. 



" Rostrum short, concave, its extremity rounded. Appendicula of 

 the superior antennae very short. Gnathopoda and first two pairs 

 of pereiopoda slender, the latter -^-ith unexpanded joints and spi- 

 nous extremities ; hairs simple, except on the thii'd pair of j^ereio- 

 poda, where they are long and plumose ; last pair of pleopoda with 

 flattened lanceolate rami, the external ones the longest. Telson 

 consisting of two lameUiform processes, emarginate at the extre- 

 mities. 



" Length \ of an inch. 



" Uab. Japan." — Stimpson. 



