APPENDIX. 355 
Gen. HystErocarrvus. 
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.: Gunther. )* 
(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 conically 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 papilla. 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, 
AA 2 
