RALISTID^. OSTRACIN^. 



323 



which is a crest-like 

 prickly lobe; tail end- 

 ing in a long fila- 

 ment. 



C. monstrosa. Bloch, 

 pi. 124. {fig. 101.) 



Callo7'hynchus Gronov. 

 Snout terminating in 

 a fleshy lobe^ which curves over in front of the 

 mouth ; caudal fin surrounding the sides of the 

 pointed tail. 



C. antarctica. Gronov. pi. 4. f. 1,2. (Vol. I. p. 125. %. 9. a.) 



Order IV. PLECTOGNATHES. Cheloniform Fishes. 



Skeleton sub-cartilaginous ; ribs obsolete ; branchial 

 spiracle single ; scales none ; eyes small^ almost vertical. 



Family 1. BALISTID^. 



Body ovalj either mailed with plates or covered by a 

 hard coriaceous skin ; mouth very small ; jaws im- 

 moveable. 



1. SuBFAM. OSTRACINiE. 



Body smooth, quadrangular in the typical, and triangu- 

 lar in the aberrant groups, covered by angulated bony 

 plates, soldered at their sutures ; dorsal fin one ; no 

 ventral fin ; caudal rounded, 



OsTRAcioN Linn. Body quadrangular j destitute of 

 spinal processes. 

 O. cubicus, Bloch, pi. 137. nasus. lb. pi. 138. 



Tetrosomus Sw. Body quadrangular ; armed with 

 spines on the back and belly. 



T. turritus. Bl. pi. 136. 

 Y 2 



