jo. 1324. ELASMOBRANCHIATE FISHES— JORDAN AND FOWLER. 049 



This genus, as here understood, comprises all those Rajidse, which 

 lave the pectoral tins not continued around the snout, the ventrals 

 leeply notched, and the caudal tin little developed, or wanting. The 

 ail is very distinct from the disk, and is provided with 2-ra\cd dorsal 

 ins. The skin of the body is usually more or less spinous; the denti- 

 ion ditfers in the two sexes, and the male is usually provided with a 

 lifl'erentiated patch of spines on each pectoral. Species numerous, 

 Qostly of the northern seas. 



((raja or /'«/«, a ray, or skate.) 



Snout not produced. 



h. Dorgal fins united; a single row of spines on l)ack of tail; everywhere rough- 

 ened above; no spines on supraorbital ridge inDiradiyx, 40. 



hb. Dorsal lins well separated; skin above mouth smooth. 



r. Angle of disk posterior to middle of its length; several rows of spines on ])ack 

 of tail (only 1 row in young); spines on supraorl)ital ridge. 



(/. Teeth in oO rows; size large .fusai, 41. 



<ld. Teeth in 45 rows; size moderate mcerrlervoorti, 42. 



bb. Angle of disk about opposite center of its length, and its anterior margin 

 broadly convex; 5 irregular rows of spines on back of tail; teeth in 45 rows. 



kenojei, 43. 

 lia. .Snout very long, produced, tapering to a narrow point; teeth in 38 rows. 

 I (eiK/a, 44. 



40. RAJA ISOTRACHYS Giinther. 



Rrija imtrachii>i Gunther, Deep Sea Fishes, Challenger, 18S7, p. 7, pi. in; south 

 of Japan. 

 i Snout rather produced, anterior margins meeting at nearly a right 

 angle; distance between outer margins of nostrils equals their distance 

 :from end of snout; teeth small, each with a point directed backward 

 itoward interior of ))uccal cavity. Body and tail entirely covered on 

 upper surface with minute asperities, each with a stellate base; no 

 spines on superciliary margin; a single small spine in middle of back; 

 |a series of rather strong spines (eighteen) along the median line of tail, 

 none on sides. Outer pectoral angle rounded, margins of fin would 

 meet at a right angle. Upper parts uniform, l)rownish-gray; lower 

 iparts smooth, brownish-black. A female taken at Station 235 in 3(55 

 i fathoms. (Gunther.) 



This species we only know from GiintherV descrijition. The i^late 

 represents the dorsals as joined at base. 



South of Japan, in deep water; one female known, 22i inches long. 



(/(TOST, equally; rpaxvz, rough.) 



41. RAJA FUSCA Garman. 

 R<yafmca Garman, Proc. U. S. Nat. Mus., 1885, p. 42; Japan. 

 (Type, No. 26542, Mus. Comp. Zool.; taken from the egg case.) 

 A Very young specunen of some large skate, reseml)lnig Baja meer- 

 dervoorfi, taken from the eg^ cascN is thus described by Mr. Garman: 

 Length, 4f inches; width, 2; length of pectorals, U inches. 

 Proc. N. M. vol. XXVI— 02 44 



