XXXVIII. A NEW STING RAY OF THE 

 GENUS TRYGON FROM THE BAY OF 

 BENGAI.. 



By N. Annandai^b, D.Sc, Superintendent , Indian Musewn. 



Among the Selachians recently captured by the Bengal Govern- 

 ment's trawler " Golden Crown " is a large specimen of a species 

 of Sting Ray which does not appear to have been as yet described. 

 It may be defined as follows : — 



Trygon microps, sp. nov. 



Size large. Colour white ; the dorsal surface of the disk suff- 

 used with rose-pink, without definite markings ; tail grey above, 

 becoming darker distally. Disk rhombic, wider than long by 

 more than one quarter of the width ; the pectoral angles rather 

 greater than right angles. Snout rounded as a whole, but with a 

 small terminal projection. Eyes very small, dark in colour, little 

 prominent ; spiracles large, without dorsal flaps, their area more 

 than eight times that of the eyes ; distance from eyes to tip of 

 snout more than twice as great as that from eye to eye. Tail 

 without cutaneous fins, longer than disk, consisting of a broad, 

 flat proximal part about half as long as the disk, and a slender, 

 cylindrical distal part probably longer in unmutilated specimens, 

 a single massive spine borne at the junction of the two parts ; a 

 very low ridge on the ventral surface of the distal part. Skin 

 soft and delicate, without enlarged tubercles on the disk, bearing 

 numerous minute, spiny denticles, which become rather larger on 

 the tip of the snout £,nd the region surrounding the eyes and spira- 

 cles ; proximal part of the tail armed with much larger spiny 

 denticles, which are largest on the sides and only bear very short 

 spines on the ventral surface ; distal part densely clothed with 

 denticles similar to but smaller than those on the sides of the proxi- 

 mal part. Mouth large ; upper jaw undulating slightly, lower 

 jaw practicalh" without undulation ; a ser ated cutaneous flap 

 hanging down from the roof of the mouth ; five short finger-like 

 processes on the floor of the mouth, three in the centre and one 

 at either side. 



Measurements of the type specimen ( 9 ). 



Length of disk . . . . 4 ft. 7 inches (137 cm.) 



Breadth of disk .. . . 6 ,, 6 ,, (195 ,, ) 



Length of tail (? mutilated) 6 ,, 5 ,, (193 ,, ) 



