3162 Bulletin //, United States National Miiseum. 



1157 (e). CHIROSTOXA CRYSTALLINUM, Jordan & Snyder. 



Head 3; depth 4; depth of caudal peduncle 34 in head; eye 5f ; snout 

 2f; interorbital space 44; height of spinous dorsal 4-^; soft dorsal 2; anal 

 2i; length of pectoral li; ventral 2f; caudal If; D. V-13; A. 24; P.15; 

 scales 56-18, 10 between dorsals. Body deepest above ventrals, widest at 

 insertion of pectorals; head long and pointed, its upper contour straight; 

 snout, viewed from above, sharply pointed, the lower jaw projecting 

 beyond upper a distance equal to not more than half diameter of orbit; 

 eye nearer tip of snout than to posterior edge of opercle a distance 

 equal to diameter of pupil ; mouth oblique, the cleft extending down- 

 ward to a level with lower edge of pupil; lips thickened posteriorly, the 

 lower folding over the upper at angle of mouth; teeth minute, in wide 

 patches, not arranged in definite rows, on upper and lower jaws; no teeth 

 on vomer or palatines; gill-rakers on first arch 27, slender, the length of 

 longest equal to diameter of pupil; vertebr.e 44. An indefinite lateral 

 line extending along the body about 9 scales below first dorsal, the pores 

 absent on many of the scales; scales crenate, largest along color-band, 

 growing smaller above and below, much smaller and closely crowded on 

 the body anterior to the pectoral fin, from the isthmus to the occiput; a 

 few small scales at upper end of opercle, along bases of fins, and on the 

 inter-radial membranes of caudal for half its length; scales between 

 dorsals large and not crowded together; lower jaw and upper part of 

 snout naked; first 3 spines of dorsal about the same length, reaching, 

 when depressed, to \ their length of insertion of soft dorsal ; first dorsal ray 

 longest, others gradually shorter ; anal inserted on a perpendicular passing 

 through a point half way between origins of dorsals, base much longer 

 than that of dorsal; first dorsal ray longest, others gradually shorter to 

 middle of fin, all remaining rays of about the same height; caudal deeply 

 forked, the tips rounded; pectoral pointed, extending a little past base 

 of ventrals; tips of ventrals extending to vent. Body, during life, trans- 

 luceut, with a slightly bluish tinge; in alcohol, yellowish; upper scales 

 with dusky edges; top of head dusky; upper part of eye dark; fins, 

 except ventrals and anal, with a little dusky color; a silvery color band 

 extending from upper part of pectoral base to caudal, narrower on caudal, 

 widening at base of caudal. 



C, crystallinum closely resembles C. ocotlane in general appearance. The 

 much shorter lower jaw and the smaller eye of C. crystallinum are at once 

 distinguishing characters. Guadalajara and Laguna de Chapala, Mexico. 

 (Jordan & Snyder.) 



Two specimens from the Guadalajara market are shrunken so that the 

 orbit is larger ; and the teeth more evident than in those taken at Ocotlan. 



Known from Laguna de Chapala, near Ocotlan, Jalisco, Mexico, and the 

 market at Guadalajara. (Type, No. 6158, L. S. Jr. Univ. Mus. Coll. J. O. 

 Snyder.) 



Chirostoma crystallinum, JORDAN & SNYDER, Bull. U. S. Fish Coin. 1899 (1900), 139, Laguna 

 de Chapala, Mexico. 



