105 



As I always place the smallest forms with the most rounded skull 

 at the head, and give the bird-types with the largest pectorals, which 

 enable these forms to fly, the second place, and as I see in the 

 Peristethus the bone- or reptile-fish, and in Prionotus the real fish- 

 type, my arrangement of the genera in this little subfamily is as 

 follows : — 



I. Cephalacanthus. 

 II. Dactyloptera. 



III. Peristethus. 



IV. Prionotus. 

 V. Trigla. 



After this preface, we proceed to distinguish the different species of 



Genus III. Peristethus (Peristedion *). 



Peristethus cataphractus. (PI. VIII. fig. 1.) 



Peristedion cataphr actum, Lac. 



P. cataphractum (J) et chabrontera ( $ ), Risso, iii. p. 402. 



Octonus holosteon, Raf, 



Trigla hispanorum chabrontera, Osb. 



Trigla hamata, Bl. Schn. 



Malarmat, Rond. p. 237 (c?)> excellent fig. ; Cuvier & Val. iv. 

 p. 101 (6*)> excellent fig. 



Peristedion malamart, Yarr. p. 67 ( 6 ), excellent fig. 



This figure of Bloch, t. 49 (6), is bad, shows too many scales 

 and rays in the second dorsal. 



Diagn. — Front with three thorns. Eye-covers with thorns. Pre- 

 opercle leaf-shaped, without prolongation. The length of the 

 head to the breadth under the middle of the eyes as 2 T 7 ^ : 1 . 

 Breadth of the head nearly equal to its height, measured under the 

 eyes. The forks more or less divergent. 



Not exceeding the length of a foot. Common in the Mediter- 

 ranean, more rare in the Channel. 



Peristethus orientalis. (PI. VIII. fig. 2.) 



Peristedion orientals, T. & Schleg. Fn. Jap. t. xiv. f. 5, 6 ; t. xv. 

 f. 1, 2. 



Similar in length to P. cataphractus, but without thorns on the 

 front, and eye-covering. A female, besides the short rays of the first 

 dorsal, shows the ventral shield separated into two, which is abnor- 

 mal. On the symphysis are three small skin prolongations, and 

 behind it a longer one. 



I find the true specific character in the form of the head, and 

 therefore doubt whether the number of the rays shows a great dif- 

 ference from the other species. 



* The name Peristedion is wrongly formed. 



