1904.] NATURAL SCIENCES OF PHILADELPHIA. 233 



reaching f of space to spinous anal, spine about 4 length of fin. Anus 

 close to origin of anal fin. 



Color in alcohol brassy-silvery, brownish above lateral line and on 

 upper surface of head. Pale longitudinal lines on trunk about ten, 

 three above lateral line. Fins all pale, upper marginal portion of 

 spinous dorsal between first and fourth spines dusky-brown. 



Length 1^^ inches. 



Type No. 23,769, A. N. S. P. Thornton Island, South Pacific. 

 C. D. Voy. Presented by Prof. E. D. Cope. 



A single example, described above. It is in the Rhynchichthys stage 

 and does not seem to be the young of any known species. It appears 

 closely related to Holocenthrus binotatus (Quoy and Gaimard),but differs 

 in the more slender body, fewer anal rays, dark blotch on the upper 

 anterior portion of spinous dorsal, and more scales in the lateral line. 

 It is also different from Holocenthrus hrachyrhynchus (Bleeker). 



(Named for Thornton Island, formerly Caroline Island, Lat. 10° 0' 01" 

 S., Long. 150° 14' 30" W., in Polynesia.) 



Holocentlirus siccifer (Cope). Fig. 5. 



Holocentrum sicciferum Cope, Trans. Am. Philos. Soc. Phila., XIV, 1871, p. 

 465. New Providence, Bahamas. (Dr. H. C Wood.) 



D. XI, 14; P. I, 14; V. I, 7; 3^ scales between origin of spinous 

 dorsal and lateral line; 3 scales between middle of spinous dorsal and 

 lateral line; 7 scales between lateral line and anus; snout 5 in h'^ad, 

 from its own tip to end of opercular spine; interorbital space 3|-; 

 maxillary 3; fourth dorsal spine 2^^; fourth dorsal ray 2; third anal 

 ray If; least depth of caudal peduncle 4; pectoral If; ventral H; 

 width of head 1^; depth of head over posterior margin of eye 1^. 



Body rather ellipsoid, profiles similar, and greatest depth about 

 midway in length of trunk. Caudal peduncle compressed, its least 

 depth If in its length. 



Head robust, rather deep, and compressed. Upper jaw protruding 

 a little beyond broad and convexly rounded snout. Eye large, 

 impinging on upper profile, circular. Mouth small, a little oblique, 

 when closed mandible a trifle inferior. Rather broad bands of minute 

 villiform teeth in jaws. Tongue slender, pointed, and free. Nostrils 

 without spines, close to upper front margin of orbit. Interorbital 

 space broad, flattened. Margin of preopercle finely serrate, upper 

 free edge of spine about f of pupil. 



Gill-opening extending opposite front margin of pupil. Rakers 

 moderate, shorter than filaments. Pseud obranchise large. 



Scales large, those along middle of side narrowly imbricated. Five 



