64 THE PLAGIOSTOMIA. 



spots. Females are adult at twenty-eight inches; the largest at hand is thirty- 

 two inches in length. 



Chiloscyllium griseum. 



Chiloscyllium griseum Muller & Henle, 1841, Plagios., p. 19; Regan, 1908, Proc. Zool. soc. Lond., 



p. 360, pi. 11, f. 1, pi. 13, f. 3, juv. 

 Chiloscyllium plagiosum Muller& Henle, 1841, loc. cit., p. 18; T. Cantor, 1849, Malay, fishes, p. 392. 

 Chiloscyllium obscurum Gray, 1851, Chondropterygii, p. 35. 

 Chiloscyllium plagiosum Bleeker, 1852, Plagios., p. 17; Ddmeril, 1865, Elasm., p. 328; Day, 1865, 



Fishes Malabar, p. 267. 

 Chiloscyllium hasseltii Bleeker, 1852, Plagios., p. 19. 



Chiloscyllium indicum Gunth., 1870, Cat. fishes British mus., 8, p. 412 (part). 

 Chiloscyllium indicum Day, 1878, Ind. fishes, p. 726, pi. 188, f. 3. 



Elongate, depressed, body cavity five twelfths, head one fifth of the total 

 length. Head rather large, broad posteriorly, narrowed forward, flattened 

 beneath; snout depressed, subacuminate, blunt at the end. Nostrils near the 

 end of the snout, inferior, with a nasoral groove; anterior valves and cirri 

 reaching the teeth, widely separated by the preoral attachments, behind which 

 they present an angle on the free margin ; posterior valves forming a fold at the 

 outer side of each nostril, continued in another along the outer side of the nasoral 

 grooves and subcontinuous with the upper labial folds, with a short free extrem- 

 ity at the angles of the mouth. Mouth wide, transverse, nearer to the eye than 

 to the end of the snout, with short labial folds around the angles, on both jaws, 

 and with a transgeneial fold of conspicuous width below the symphysis. Teeth 

 small with sharp triangular median cusps concave on the lateral margins and with 

 broad bases, with or without feeble indications of a lateral cusp at each side of 

 the median. Eye small, in length one fourth of its distance from the end of 

 the snout. Spiracle as large as the eye and more behind than below the orbit, 

 with a prominent fold on the posterior edge. Gill openings narrow, third and 

 fifth widest, fourth and fifth close together, hindmost three above the pectoral. 

 Scales small, carinate, keels converging; when worn smooth the scales have per- 

 ceptible indications of five to nine keels around the front edge. 



Pectorals and ventrals short and broad, subtruncate, angles broadly rounded. 

 Dorsals smaller than the ventrals, second smaller, both much longer than high, 

 hinder angles not produced, hind margins truncate, that of the second more 

 oblique, bases and distance apart equal, more than twice the distance of the 

 second from the origin of the anal; origin of the first dorsal above the middle 

 of the bases of the ventrals. Anal long, little less than the subcaudal. 



Olivaceous brown, whitish below the body and head. 



Young with about ten transverse bands of light color, and with light spots 

 on the fins. 



