21 



is a single short series between tlie dorsal fins, and the sides of the tail from end 

 to end are thorny. 



The distance between the two dorsal fins is greater than the length of 

 either : the first dorsal is the higher, the second, which is confluent with the 

 rudimentary caudal, is the longer. 



Colours : upper surface warm brown with a pair of large ocelli behind the 

 shoulder girdle : under surface dirty white. 



A single female 12^ inches long from the Gulf of Martaban 67 fathoms. 



Regd. No. ?f . 



Apparently alhed to the Kerguelen Raja murrayi, Gthr. 



Named after Lieutenant Powell of the Indian Navy : a colleague, in the old 

 Marine Survey branch of the service, of Captain Moresby. 



9. Baja Johannis-Davisi, n. sp. 



Illdsteations of the Zoology of the Investigator, pl. XXVII. fig. 2. 



The disk without the ventral fins is nearly half the total length, and its 

 breadth is much more than its length with the ventrals : it is rhomboidal with 

 the angles, except the rostral, rounded, and with the two anterior sides much 

 longer than the other two : the anterior margin of the pectoral fin is broadly 

 sinuous. 



Snout slender and much exsert : its length, measured from the mouth, is 

 close on a third the greatest breadth of the singularly broad disk and is If times 

 the distance between the outer margins of the nostrils. 



Major diameter of orbit equal to the width of the interorbital space and 

 nearly twice that of the spiracle. 



Mouth straight : teeth obtusely pointed (male) in about 32 very oblique 

 rows in the upper, and about 30 in the lower jaw. 



Both surfaces of disk smooth, except for some star-shaped prickles on the 

 ventral surface of the rostral cartilage and of the edges of the snout and adja- 

 cent part of the pectoral fins. 



Two strong spines on the anterior margin and one at the posterior angle of 

 either orbit : a very strong spine in the middle of the nape. An eminence but 

 not a distinct spine on either side of shoulder and pelvic girdles. Tail smooth 

 except for a mid-dorsal row of large spines which extend from its base to the 

 second dorsal fin. 



The distance between the two dorsal fins is rather more than half the lenerth 

 of the base of either : the two fins are of about equal size and the second is 

 confluent with the caudal. 



Colours : smoky black above, black mottled with white below. 



