104 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 3 



ing ventrally to include base of pectoral, then extending postero- 

 ventrally to anterior two-thirds of anal base, upper margin of this 

 dark band pale, with a light grey line running from middle third 

 of body band to posterior dorsal base; triangular black patch on 

 caudal peduncle joining an encircHng dark band posterio- 

 dorsally, with margins pale; area around anus black; pectoi-al, 

 dorsal, and anal fins pale; caudal fin pale, rays dusky; dorsal 

 rays III-ii,21 or 22; anal i,20; pectoral i,12; scale rows 39 to 

 43; gill rakers on first arch 23 or 24. 



Rhinecanthus rectangulus (Bloch and Schneider) 

 116. Caudal peduncle spines black but not contained in a black tri- 

 angular patch but in oblong white area; 3 rows of strong 

 antrorse spines, 2 upper rows each with 10 to 12 spines of 

 about equal length, lower row one-half to one-third length of 

 upper with 3 to 5 spines; ground color of upper parts of head and 

 body light greyish brown, of lower parts pale yellowish white; 

 blue bordered or pale bordered black band from interorbital 

 to pectoral base; anus black; a black patch with diffuse edges 

 extending from base of pectoral dividing into two branches, 

 one to origin of soft dorsal, the other to posterior base of soft 

 dorsal; from lower edge of patch, 4 lines extend obliquely 

 posteroventrally, the first, broad, extending to anus, the second, 

 narrow, fading below, the third, broad, reaching middle anal fin 

 base, the fourth, narrow, fading below; pectoral, dorsal, and 

 anal fins pale, caudal fin pale dusky; dorsal rays III-ii,23 or 

 24; anal i,21 or 22; pectoral i,12 or 13; scale rows 41 or 42; 

 gill rakers on first arch 21 to 25. 



Rhinecanthus aculeatus (Linneaus) 



Genus CANTHIDERMIS Swainson 



Canthidermis Swainson, Natural history and classification of fishes . . ., vol. 

 2, pp. 194, 325, 1839 (type species. Batistes angulosus Quoy and Gaimard). 



CANTHIDERMIS SENTICOSUS (Richardson) 



Plate 138, A 



Batistes senticosus Richardson, Zoology of the voyage of H.M.S. Sulphur and 

 Samarang, Fishes, p. 23, pi. 9, figs. 5-8, 1848 (type locality, China Sea). 



SPECIMENS STUDIED 



Eniwetok Atoll: Eniwetok Island, lagoon, April 1945, Richard G. Miller, 4 

 specimens, 30 to 46 mm. 



Description. — Dorsal fin rays III — ii,24 or 25, anal rays i,22 or 23; 

 pectoral rays i,13 or 14; branched caudal rays 5 + 5; gill rakers on 

 first gill arch 26 (one count), long, very slender; scale rows from 

 upper edge of gill opening to base of middle caudal rays 39 to 42; 

 teeth in upper jaw 8, lower jaw 8, notched. 



Depth of body 1.55 to 1.7; length of head 2.5 to 2.7; both in 

 standard length. Snout 1.8 to 2.05; diameter of eye 3.25 to 3.4; 



