DB. GtJNTHER ON THE MSHES OF CENTRAL AMERICA. 431 



from the origin of the second dorsal, and is armed witli about fifty small and low 

 shields, only a few of which terminate in a depressed spine. The pectoral fin extends to 

 the anal spines. Brownish grey, body with six dark brown vertical bands ; the first 

 crosses the body behind the base of the pectoral, and the fourth descends from the 

 middle of the soft dorsal fin. Operculum with a large black spot. IJorsal, anal, and 

 ventral black ; pectoral and caudal whitish. 



Only two examples, three inches long, were found by Capt. Dow at Panama. 



72. C!ara\x speciosus (Forsk.). 

 Having examined specimens from Panama, collected by Mr. Salvin, and compared 

 them with others from Borneo, Madras, Zanzibar, &c., I have convinced myself that C. 

 panamensis. Gill, Proc. Acad. Nat. Sc. Pliilad. 1863, p. 1G6, is identical with C. speciosus. 



74. Car.\xx HIPPOS, L. 



We have received two examples from the Pacific coast of Panama from Capt. Dow. 

 The younger one, which is 5 inches long, agrees in every point, especially in the height 

 of the body, with Atlantic examples of this species, whilst the older, 10 inches, is 

 identical with that remarkable form described by Mr. Gill as ( 'avamjus mnrginatHs 

 (Proc. Acad. Nat. Sc. Philad. 1863, p. 166). This is considerably lower in form than 

 the type, the height of the body being only two-sevenths of the total length ; but ha\ing 

 had an opportunity of comparing the example first mentioned, I do not think it entitled 

 to specific rank, but regard it merely as a variety. The formula of fin rays in our 

 example is D. 7 Ly. A. 2 I j^. 



75. Caraxx caballus. 



Trac/mnis hoops, Girard, U. S. Pac. R. R. Exped. Fish. p. 108; Giiiith. Fish. ii. p. 422 (not 



C. boops, C. & V.) 



D. 7 I ~. A. 2 1 2u^. L. lat. 37. 



The teeth of the upper jaw form a villiform band, those of the outer series being a 

 little the larger ; those of the lower are in a single series ; teeth on the vomer, the 

 palatines, and the tongue. The height of the body is two-sevenths of the total length 

 (without caudal), the length of the head rather more than one-fourth. Eye with a 

 broad adipose membrane in front and behind. Breast scaly. The lateral line is curved, 

 the width of the arch being one-half of the length of the straight portion ; the latter 

 commences in the vertical from the third dorsal ray ; the plates commence from tlie 

 beginning of the straight portion of the lateral line, and are well developed. Lower 

 jaw projecting beyond the upper ; maxillary extending to below the anterior rim of the 

 pupil. Pectoral reaching beyond the anterior anal rays. A black opercular spot. 



Two specimens were collected by Capt, Dow at Panama ; the species extends north- 

 wards to the coast of California. 



