150 PROCEEDINGS OF THE ACADEMY OP 



mated to have been about three-tenths of the extreme length, inclusive of the 

 caudal lobes ; that at the origin of the anal tin equals a quarter of the length. 

 The height behind the dorsal and anal exceeds an eighth (-13) of the total 

 length, as well as the length (behind it) of the caudal peduncle, while the 

 least height of the latter equals an eleventh (-9) of the length. 



The head forms more than a fifth (-21J) of the extreme length, and is 

 longer than high ; the height at the upper angle of the preoperculum -19, and 

 that at the pupil -17 of the same length. The diameter of the eye is contained 

 three and a half times (-6) in the head's length, equals the snout and is twice 

 as great as the height of the very oblique preorbital. The forehead and snout 

 above are nearly rectilinear, and the former between the eyes is transversely 

 arched and as wide as the diameter of the eye. The preoperculum is oblique 

 behind and scarcely emarginated at its lower half, has its angle rounded and 

 its inferior margin slightly ascending. The mouth is small and very oblique. 

 The teeth are conic and curved, continued to the angles of the mouth and 

 larger in front ; behind is a transverse row of smaller ones. 



The dorsal fin commences above the bases of the ventrals ; its spinous por- 

 tion is rather elevated, and its last spines rather shorter than the preceding ; 

 its base much exceeds a quarter (-28) of the length ; that of the soft nearly 

 equals a seventh (-14) of the length ; at its middle the height nearly equals an 

 eighth (-13), and behind a tenth ( 10) of the length. 



The anal, like that of Furcaria puncta, has its second spine as long as the 

 succeeding rays, which are nearly uniform or even slightly increase towards 

 the last.* 



The caudal forms more than a quarter (-27) of the extreme length, the lobes, 

 especially the upper, being prolonged and pointed, while the median rays only 

 equal a tenth (-10) of the length. 



The pectorals are rather long (-18) and bluntly angulated. The ventrals 

 have the first ray filiform and equal to the pectorals ; its base is behind that of 

 the pectorals. 



The scales have been mostly rubbed off in the single specimen in the mu- 

 seum. Those on the cheeks are triserial. 

 1 



D. XII. 11-. A. II. 12. 

 1 4 



Scales 3233. Lat. line sup. 21, (inf. 17 !) 

 10 



The color is dark green. The dorsal blackish, except the hinder portion, 

 (last four or five rays,) which is colorless. The caudal has its margins above 

 and below black. 



A single specimen was sent to the Institution by Mr. Xantus. It is in poor 

 condition and slightly less than four inches long. 



Genus GLYPH1DODON Lac. 



Glyphidodon Tkoschelii Gill. 



The form is similar to that of Glyphidodon saxatilis (Lac.) and its allies. The 

 height equals half the length, exclusive of the caudal. The head forms a third 

 of the same length and is as long as it is high close behind the eyes. The eye 

 has a diameter nearly equal to a third of the head's length, is separated by a 

 diameter from the muzzle, and the same distance from its fellow. The inter- 

 orbital area is transversely convex. The preorbital bone is nearly parallel 

 with the straight suborbitals. The preoperculum has a vertical posterior and 

 horizontal inferior border, and its angle is obtuse or rounded. 



The dorsal begins over the base of the lower rays of the pectorals. The pec- 



* Furcaria cyanea is represented by Poey with the anal acuminate at the middle like the 

 dorsal. 



[March, 



