NATURAL SCIENCES OF PHILADELPHIA. 289 



rim of orbit. Dorsal spine 1.5 times in length in front of its 

 base; pectoral scarcely be3'ond base of ventral. The ridges of 

 other species are represented by rows of bristles. No ridges on 

 the head. Color black, unspotted, or in a smaller specimen with 

 faint pale spots above. Length .067 m. Two specimens with the 

 preceding. 



This species and the C. malacops might have been regarded as 

 the young of C. tectirostris and G. alga, respectively, were it not 

 that the larger individuals possess the characters of immaturity 

 exhibited by other animals, viz., larger head, and less ossification 

 of the derm of the muzzle. 



LOKICAKIA ACUTA, Cuv. Val. 



XV. 473 ; Gthr., Calal. B. M. v. 258. 

 From the Amb^'iacu. 



PAKIOLIUS, Cope, gen. nov. 



Allied to Trichomycterus. Ventral fins present, anterior to the 

 short dorsal. Anal fin short; vent situated beneath the dorsal 

 fin ; no adipose fin. No nasal barbel, one maxillary and two 

 lateral mentals. No armature on any of the opercular bones. 

 Teeth in brush-like series. 



This genus is allied to Trichomycterus in the extensive bran- 

 chial fissures and other characters, but diflers in the absence of 

 armature of the head, and number and position of tentacles. 



PAEIOLIUS ARMILLATUS, Cope, sp. nov. 



Head flat rounded, ej^es small, superior, covered by the skin. 

 Head 4. .5 times in length to basis of caudal fin. Depth at D. I. 

 one-half length to basis pectoral fin; width of head two-thirds 

 the same distance. Interorbital width 3.GG times in length of 

 head. Maxillary and external mental barbels extending beyond 

 basis of pectoral ; inner mental barbel on half the same. Kadii 

 D. 7; P. 8 ; V. 6 ; A. 11 ; caudal acuminate. Skin entirely smooth. 



Color dark-brown, nearly black on the top of the head; under 

 surfaces from anus brownish-yellow, brown punctulate. A broad 

 yellow collar extends from the under surface on each side across 

 the bases of the pectoral fins and the vertex. A vertical dark 

 spot on base of caudal ; fins brown-spotted. 



1872.] 



