SJO Capt. R. E, Lloyd on some 



'i'lie moutli is widely but distinctly V-shaped ; in width it 

 is 1| in the length of the snout. 



There are eighty rows of teeth in the upper jaw and sixty 

 in the lower. Teeth low and triangular, on a rhomboidal 

 base. 



The edges of the nasal valves are deeply fimbriated and 

 arc united across the middle line by a distinct fold of skin, 

 which is separated from the upper jaw by a deep curved 

 groove. 



The dorsal fins are equal in length ; the distance between 

 them is greater than the length of either. Caudal fin small. 



Colour uniform brown above, with a dark ocellus at the 

 base of each ]3ectoral fin, surrounded by a paler ring. 



Uniform white below; the tail shows dark mottling on its 

 lower surface. 



One small male specimen, measuring 3G cm. in its greatest 

 length and 23 cm. in its greatest breadth, was taken from 

 130 fathoms in the Gulf of Aden. 



Rai'a reversa, sp. n. 



The greatest breadth of the disk is equal to the length 

 from the snout to the root of the taih 



The cloaca is slightly nearer the end of the snout than the 

 end of the tail. 



The interorbital space is ^ the length of the snout measured 

 from an eye or the middle of the moutli. 



The anterior borders of the pectoral fins are sinuous and 

 together form an angle of about 80°. 



The snout is prominent. 



The lateral angle of the pectoral. fins is rounded. 



The spiracle is large ; its greatest diameter equals that of 

 the eye. 



The skin over the skull, but not over the snout, is covered 

 with fine denticles. 



The anterior half or more of the pectoral fins is covered 

 witii small denticles. 



There are two series of larger spines on the pectoral iin^, 

 one series of about twenty opposite the shoulder-girdle (male 

 characteristic probably) and another of about fifteen opposite 

 the eye. 



There is one large white stellate spine in front of the eye 

 and two or three smaller ones behind. 



'J'here are four or five similar spines in the mid-dorsal line. 



On the dorsum of the tail are three regular rows of large 

 spines, those of the middle row being about half as numerous 

 as those of the lateral rows. 



