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 callosee in 20 fathoms in the 

 Hake Bay." — Stimpson.'* 



7. Genus NEOTANAIS Beddard.& 



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

 and a fiagellum of four joints. Second pair of antenna? with a five- 

 jointed peduncle and a short four-jointed fiagellum. Chel« 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 OP THE GENUS NEOTANAIS. 



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

 a'. 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, tigs. 4-6. — Richardson, 

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

 1901, p. 504. 



Zocalltie.s. — Southeast of New York; latitude 38*^ 34' north, longi- 

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



IJeptL~l,24:() 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 anteriorlv and wider 

 posteriori}' ; 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. 



