32 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



and in the other pairs short. The legs of the posterior pair are a little 

 the longest and thickest. The ambulatory feet, in five pairs, are of 

 great length and resemble those of the Amphipods. The caudal stylets 

 are in length about four-fifths that of the abdomen, and consist of four 

 or five articles with few hairs, each article becoming narrower, the last 

 one with a tuft of few hairs at its extremity. Length, .15 inch; 

 breadth, .02. Dredged among Ascidise callosse in 20 fathoms in the 

 Hake Bay." STIMPSON." 



7. Genus NEOTANAIS Beddard.& 



First pair of antennae (in the male) with a three-jointed peduncle 

 and a flagellum of four joints. Second pair of antennae with a five- 

 jointed peduncle and a short four-jointed flagellum. Chelae fully 

 developed and of normal structure in male. Exopodite of uropoda 

 two-jointed; endopodite eight-jointed. Thoracic appendages special- 

 ized into an anterior and posterior series; in the three anterior tho- 

 racic appendages the distal joint is a simple, elongated, somewhat 

 curved claw; in the posterior appendages this terminal joint is fur- 

 nished at its extremity with a circlet of stout spines and a long, mesi- 

 ally placed, slender hair. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS NEOTANAIS. 



a. Rostrum blunt. Ocular lobes minute but separate. .Neotanais americanus Beddard 

 of. Rostrum sharp. Ocular lobes not distinct. 



Neotanais hastiger (Norman and Stebbing) 



NEOTANAIS AMERICANUS Beddard. 



Neotanais americanus BEDDARD, Proc. Zool. Soc. Lond., 1886, pp. 117-118; Chal- 

 lenger Report, XVII, 1886, pp. 124-125, pi. xvi, figs. 4-6. RICHARDSON, 

 American Naturalist, XXXIV, 1900, p. 212; Proc. U. S. Nat. Mus., XXIII, 

 1901, p. 504. 



Localities. Southeast of New York; latitude 38 34' north, longi- 

 tude, 72 10' west; and latitude 35 39' south, longitude 50 47' west. 



Depth. 1,240 fathoms. 



"The present species is the only representative of this new genus. 

 The specific as well as the generic characters depend upon the exam- 

 ination of two male specimens, each of which measures about 6 mm. 

 in length. 



"The body is depressed and elongated, everywhere of approxi- 

 mately the same diameter. It is smooth both dorsally and ventrally, 

 with no hairs or spines. 



"The cephalothorax is pear-shaped, narrower anteriorty and wider 

 posteriorly; it is about as long as the first two segments of the thorax 



Smithsonian Contributions to Knowledge, VI, 1853, p. 43. 

 &See Beddard for characters of genus. 



