1622 Bulletin ^7, United States National Museum. 



line before dorsal. Species numerous, of small size, mostly of dull or 

 olivaceous coloration. This genus is closely related to Sparisoma, differing 

 from it in having the anterior teeth nearly separate at all ages andiii hav- 

 ing the dorsal spines flexible, as in Scants. The dentition approaches 

 that of a very young Sparisoma. This genus has been generally known as 

 Callyodon. The genus Calliodon of Groiiow and of Bloch & Schneider was, 

 however , based on a species which apparently belongs to the genus Scarus. 

 The name was transferred by Cuvier from the type of Scarus croicensis to 

 the present group. This transfer is inadmissible in our view, and the 

 name Calliodon should not be used for the genus. Catty odon, variant 

 spelling of the same word, is also inadmissible. The name Cryptotomus 

 was proposed by Cope for a fish having the "dentition of Callyodon, but 

 with the numerous dorsal and anal spines of the group of Harpe" The 

 fin rays are given D. XI, 8; A. Ill, 8. The numbers in all known species 

 of Scarince are D. IX, 10; A. Ill, 9 (8). We find on examination of the 

 original type of Cryptotomus that Professor Cope has mistaken 2 of the 

 (broken) soft rays of the dorsal and 1 of the anal for spines. The differ- 

 ence between spines and soft rays in this group is very slight. We there- 

 fore regard Cryptotomus as a synonym of Callyodon Cuvier, and the latter 

 name being ineligible, we adopt Cryptotomus as the name of the genus. 

 s, hidden; rojuog, cutting (teeth).) 



a. Posterior canines normally present (occasionally wanting on one side or both in some 



species). 

 b. Lateral teeth of lower jaw arranged in a series continuous with the anterior 



teeth, thus: 



c. Snout long and sharp, 2 in head, the profile somewhat unevenly convex; 

 upper lip douhle only posteriorly ; posterior canines 2, strong, recurved. 



DENTIENS, 2032. 



cc. Snout shortish, its length (measured along the axis) nearly 3 in head; pro- 



file strongly convex above eye, thence nearly straight to tip of snout ; 



posterior canine usually single, very strong. KETRACTUS, 2033, 



bb. Lateral teeth of lower jaw subequal, arranged in 2 rows which are not parallel, 



the posterior teeth of the anterior series standing below and outside the 



anterior teeth of the posterior series, thus : 



d. Posterior canine usually preceded by 2 or 3 smaller ones ; upper lip double 



for its whole length. USTUS, 2034. 



dd. Posterior canine usually single, sometimes wanting; teeth otherwise 



much as in C. ustus, the anterior canines smaller; upper lip not 



double for its whole length. AUROPUNCTATUS, 2035. 



aa. Posterior canines none; lateral teeth in each jaw subequal, those of the lower jaw 



larger than those of the upper and forming a continuous series. 

 e. Teeth of outer (anterior) series in upper jaw few, small, not canine-like, scarcely 

 different from the lateral teeth; lower jaw without enlarged teeth; upper 

 lip double for its entire course, the inner fold very narrow mesially , body 

 moderately elongate, the depth 3| in length; head 3; snout rather sharp, 

 2| in head; profile gently curved, not steep; diameter of eye 4| in head, \\ 

 in its distance from the angle of the mouth; caudal subtruncate. Color 

 olive gray, much mottled, sides with faint longitudinal whitish stripes; 

 head with some greenish spots ; fins pale, mottled with olive. 



BERYLLINUS. 2036. 



