f\im. CYTTID^ 



Cyttosoma, n.g. 



Body compresseci and elevate, head not .->o much compressed. 

 Upper profile concave. Eyes xerry large, scales small, deciduous 

 and replaced by spiny tubercles on head, nape of the neck (to i st 

 dorsal), thoracic and abdominal regions and by hard spiny 

 scales along bases of dorsal and anal fins. Dorsals nearly 

 separate, being joined by very low membrane, the first having 

 seven spines and much shorter than the second. There are 

 three anal spines. Rays of dorsal 29, anal 28, pectoral 22, and 

 ventral "^ ; pectoral and ventral well separated. Minute teeth in 

 lower jaw, none in upper jaw, vomer or palatine bones. Bran- 

 chiostegals 7. 



Cyttosoma boops, n.sp. 



(Plate XXIII.) 

 Br. VII. D. \U 29. A. Ill 28. V. I ;. L. 1. roo (.approx.). 



The upper jaw 13 very protractible and can be drawn out i|- 

 times its normal distance from the eye. The greatest depth of 

 the body is 2^, times the diameter of the eye, and is contained a 

 little more than i^ in total length which is 158 mm. (mouth 

 closed). The length of the head is contamed 2^ tmies in the 

 body. Interorbital space if diameter of the eye The lower 

 ridges of the mandible serrate. Opercular bones are not serrate. 

 The superior profile of the body rises abruptly behind the eye 

 to the origin of the dorsal and continues backwards in the form 

 of a thin ridge with straight border to within a distance from 

 the root of the caudal equal to about | of its length. The 

 ventral profile is somewhat similar, though not so pronounced. 

 The ridge here begins under the vertical from the commence- 

 ment of the soft dorsal. It has the same straight outline. The soft 

 rays of the anal are somewhat longer than those of the dorsal. 

 The inter-maxillar\- can be received into a liorse shoe shaped 

 space which extends backwards to over the centre of the orbit. 

 It is in length i^, times the interocular width. The maxillary is 

 of the same lengtli. 



The nostrils are placed close together in front of an anterior 

 protuberance of the supra orbital ridge. The pseudobranchiae 

 are well de\eloped and the gill rakers are stout, short and lamel- 

 liforni. 



There are about 100 scales on the lateral line which extends 

 on to the caudal The greatest height of its anterior curv^e is 

 below the commencement of the first dorsal . from this point 



