APPENDIX. 355 



Gen. HYSTEKOCAKPFS. 



Body compressed ; oblong ; covered with scales of 

 moderate size. Mouth rather small ; teeth conical, in a 

 single series. One dorsal fin with from sixteen to 

 eighteen spines ; anal, with three spines and numerous 

 rays. Intestinal tract short, with two circumvolutions. 



Hysterocarpus. 

 Traskii. 



Cyclopterus orbis. (Nov. Sp. : Griinther.)* 

 (D. 7-19. A. 9.) 



The head and body form one orbicular mass, ter- 

 minating posteriorly in the narrow, short tail. The 

 plates with which the skin is covered are very rough, 

 tubercular, and conical ly elevated in the centre. A 

 series of large plates runs along the upper orbital edge 

 to the side of the back ; two series of smaller ones run 

 along the middle of the interorbital space, and along 

 the base of the dorsal fins. Other large plates occupy 

 the middle of the sides and the lateral part of the belly ; 

 the plates on the side of the head, before the pectoral. 

 are only half as large as those described, and those 

 on the tail are smaller. The mouth is transverse, not 

 extending on to the side of the head, and one-half the 

 greatest width of the interorbital space. The ventral 

 disk is shorter than the head, subcircular, entire, and 

 surrounded by fifteen flat papillae. The caudal fin is of 

 moderate length, rounded, and composed of nine simple 

 rays. Vent nearer to the ventral disk than to the anal 

 fin. 



* British Museum Catalogue of Fishes. 



A A. 2 



