NATURAL SCIENCES OP PHILADELPHIA. 47 9 



nearly black upon the under surface of the tail. The whole surface is minutely 

 spotted, and reticulated with pale yellowish. 



Total length, 13.} inches. To aau3 6 inches. To gill-opening 1J inches. 



Habitat. Sandwich Islands. 



This species is remarkably stout for its length, and presents an unusually 

 large number of teeth for the size of the animal. But a single specimen is in 

 the museum ; which specimen was collected and presented by Dr. J. K. Town- 

 send. 



6. Thyrsoidea coacolor, Abbott. Spec. char. Head compressed, slightly 

 lepressed upon the occiput Jaws slender. The eye is large, circular, its diame- 

 ter contained four times in the length of the side of the head, measuring from 

 the angle of the jaws. The dorsal fin originates at the occiput, and has a 

 slope at its commencement, of about forty-five degrees, the fin is of a uniform 

 height, until midway between the anus and the extremity of the tail, when it 

 ommences gradually to decrease. The anus is slightly anterior to the centre 

 of the body, and the anal fin, that there has its commencement, is equal in 

 width to one-tenth of the width of the body, and extends to the extremity of 

 the tail, preserving throughout a nearly uniform width. 



The nasal teeth number twelve ; they are all slender, conical and acute, with 

 a pair of minute, compressed teeth between each pair of the marginal teeth 

 three teeth stand upon the mesial line, the centre one of which is the tallest 

 tooth in the mouth. The outer row of the palatine teeth number sixteen ; they 

 are of uniform height, compresed, acute and with an inward tendency. The 

 inner row consists of two teeth, placedat the commencement of the outer row ; 

 they are similar in all their characters to the teeth upon that row, except in 

 being of nearly triple the height. On the vomer, exist ten conical, acute teeth, 

 in a straight line ; they are of a uniform size. The mandible is armed with a 

 compliment of twenty compressed, acute teeth, having a decided inward incli- 

 nation, but in a less degree than in the palatines ; the anterior six teeth are 

 much larger than the general series, and are more conical in their shape. 



Color. The head, body and fins are of a uniform purplish brown, varvino' in 

 its intensity upon the sides. 



Total length, 11 inches. To anus 5|- inches. To gill-opening \\ inches. 



Habitat. Vera Cruz. 



A single specimen is in the museum, presented by Dr. Burroughs, and labelled 

 as procured at the above locality. 



Note. On pages 326 and 327, hujus operis, there are described two Elheosto- 

 pioids, named respectively Poecilosoma transversum and Pileoma cymatogramma. 



As the name Poecilosoma, has been changed to Pcecilichthys, the name of the 

 species will hereafter be 



Pcecilichthys transversus, Abbott. 



Syn. Pozcilosma transversum, Abbott, Proc. Acad. Nat. Sci. Phila. I860 

 p. 326. 



As the genus Percina, Hald. is congeneric with Pileoma, De Kay ; and is prior 

 to that genus, the species described as Pileoma cymatogramma, Abb. will here- 

 after be 



Percina cymatogramma, Abbott. 



Syn. Pileoma cymatogramma, Abbott, Proc. Acad. Nat. Sci. Phila. 18(30. 

 p. 327. 



Note. On page 365. hujus operis, for the figure 13, given as the number of 

 rays of the anal fin, in Astroscopus guttatus, Abb., please substitute the figure 10. 



I860] 



