120 PROCEEDINGS OF THE ACADEMY OF 



PLECTOGNATHI. 



Balistes powellii Cope, sp. nov. 



This is a species allied in form and color to the B. moribundus, but ap- 

 parently nearer to the species of Hollard's group II. A.* 



Radii 2 D. 26, A. 22, preanals 9 or 10 on each side ; P. 134, C. 12. rounded. 

 Form elevated, pelvic depth 1-75 times in total length. Front convex from 

 basis of dorsal fin to spines of premaxillaries. Orbit 365.times in muzzle ; 

 jaws equal. Scales without prominent spines, those of the cheek in oblique 

 series. Two or three scapular plates. First dorsal spine 1-25 times in length 

 of muzzle, rugose. Third dorsal spine well developed. Anterior rays of 

 second dorsal and anal not much longer than the median rays. Length of 

 head (to opercular slit) 3.5 times in total ; anal depth 2-25 in the same. 



Color above, ashy, below white. Numerous longitudinally oval azure spots 

 extend in series on the sides everywhere except between the chin, pectoral fin 

 and pelvic bone. The dorsal and anal fins are marked with smaller spots of 

 the same. 



This species was discovered by my friend Samuel Powell, at Newport, 

 Rhode Island, Sept., 1867. It must be a very rare species, as it has not been 

 met with elsewhere, so far as I am aware. I have pleasure in dedicating it 

 to the discoverer, whose attention to ichthyology has been so often attended 

 with interesting results. 



Tetraodon trichocephalus Cope, sp. nov. 



Belly spinous to near vent ; dorsal region from a little behind the nares to 

 above, the ends of the pectoral fins spinous, those on the head long, close set, 

 like seal bristles. Profile suddenly descending from the prefrontal region to 

 the premaxillary region, arched from the former point backwards. Eye 3-5 

 times in head, 2-66 times in muzzle ; length of head 3-5 times in total includ- 

 ing caudal fin. Radii, D. 8, A. 7 Caudal fin even with prominent points, 

 concave when closed. Anal fin behind opposite the dorsal. Frontal width 

 1-25 times in orbit. Length four inches. 



Color, below to a line from the chin to tne inferior third of the caudal fin, 

 white ; above yellowish passing into brown on the dorsal region. The latter 

 color is faintly verniculated with the paler color, as it descends on the sides. 

 Fins uniform straw colored ; a brown spot at the base of the pectoral fin. 



This species differs in color from T. turgidus Mitch., and in the less extent 

 and longer form of the spines, as well as in the declive front. The young of 

 T. turgidus of one-fifth the length have a more slender muzzle and other char- 

 acters of the adult. The numerous dorsal bristles and form of the cranium 

 distinguish it from T. Isevigatus. It was found by Samuel Powell at Newport, 

 R. I., with the following species : 



Tetraodon geometricus L. Anechisoma Kaup, Voy. Sulphur, plate. 



A West Indian species not before detected on the coasts of the United States. 

 We have it from the Mexican coasts and from Panama. 



Supplementary note on two new fishes from the Southern Coast. 



Centropristis subligarius Cope. 



Radii, D. X. 14 ; A. III. 8. Scales, counted transversely to vent, b\ 48 18. 

 Median dorsal spines subequal, median anal appressed extending beyond basis 

 of anal fin. Caudal fin truncate behind. Form elongate oval, the head narrow 

 conical, its profile continuous with that of the anterior back, together de- 

 scending regularly from D. I to the end of the acute muzzle. Mandible pro- 

 jecting a ltttle beyond upper lip. Maxillary bone extending to opposite pos- 

 terior margin of pupil. Operculum with three points, the superior very 



*(B. capriseus type); the description is taken from a specimen only 3 - 5 inches in length- 



[Oct. 



