1919.] NATURAL SCIENCES OF PHILADELPHIA. 141 



If; eighth dorsal ray 1|; fifth anal ray If; least depth of caudal 

 peduncle 2|; free caudal rays 2; pectoral 2|. Body deep, well com- 

 pressed, deepest medially. Caudal peduncle and head compressed, 

 profiles of latter alike. Muzzle well compressed, preorbital depressed, 

 width If its length. Mouth small, terminal. Teeth enlarged 

 medianly in jaws, each with slight concave edge. Nostrils close 

 together, close before front eye edge medially. Interorbital de- 

 pressed concavely, rather blunt, occipital ridge extending up behind. 

 Gill -opening rather slightly obhque, about f of eye. Body every- 

 where roughly spinescent, spinules largest on middle of side below 

 and about ventral flap. All unpaired fin-rays with row of fine spin- 

 ules laterally, rows dividing and following branches terminally. 

 Humeral region finely spinescent. First dorsal spine inserted slightly 

 behind eye over gill-opening. Double row of spines down front 

 and one row down each side of first dorsal spine, second and third 

 spines barely I of first. Soft dorsal origin about midway between 

 hind pupil edge and caudal base, front median rays highest, fin 

 rounded. Anal similar, opposite. Caudal small, hind edge con- 

 vex. Pectoral small. Ventral spine spinescent, flap with about 

 7 irregular small spines not larger than adjacent ones. Color in 

 alcohol rather warm brownish generally, scarcely paler below, and 

 clouded pattern of broad, dark variable lines or reticulations. Dor- 

 sal and anal bases each with 3 dark brown blotches, extending as 

 irregular lines on fins. Iris brown. Length 82 mm. Type, of B. 

 asperrimus Cope, No. 800, A. N. S. P. 



Though Cope gives the type "locality uncertain, but probably 

 St. Martins, W. I.," the original label says "Darien." 



76. Canthidermis sufflamen (Mitchill). 78. Cantherines pullus (Ranzani). 



An adult example recorded by 79. Monacanthus ciliatus (Mitchill). 

 Cope as Balistes sobacus. Listed as AI. tomentosus by 



■177. Xanthichthys ringens (Linne). Cope. 



80. Pseudomonacanthus amphioxys (Cope). 



{Monacanthus amphioxys Cope, Trans. Amer. Philos. Soc. Phila., n. s., 

 XIV, 1871, p. 477.) 



Head 2f ; depth 1|; D. 11—35; A. 30; snout 1| m head; eye 3^; 

 interorbital 3j; first dorsal spine Ij; least depth of caudal peduncle 

 3j; free caudal rays 2J; pectoral about 2f. Body rather elongately 

 ellipsoid, compressed, deepest medially. Caudal peduncle and head 

 well compressed, latter with upper profile slightly concave, lower 

 equally convex. Muzzle well compressed, preorbital strongly con- 

 cave, width about 3 in length. Mouth small, very slightly superior. 

 Median enlarged lower teeth larger than upper, all with well-notched 



