NATURAL SCIENCES OP PHILADELPHIA. 169 



fin, and more than a fifth of the extreme, while the head enters 4 times in the 

 latter. The outline from the dorsal to the snout is nearly rectilinear and little 

 declined. The distance of the anal from the outer axil of the ventral equals 

 that of the posterior nostril from the margin of operculum. The first dorsal, 

 when bent backwards, rests on the fourth scale, in front of the second. The 

 second commences nearly above the twentieth scale of the lateral line. 

 The pectoral is as long as the head behind the pupil. There are eight 

 pectoral filaments, the longest of which extends rather beyond the front of the 

 second dorsal. 



D. VIII. 1. 12. A. II. 13. P. I. 1. 13. 



8 

 Scales 6970 

 14 

 The color is greenish-brown above and yellowish-green below. The oper- 

 culum is blackish. The fir3t dorsal and the pectorals, except below, are 

 also blackish, as is likewise the margin of the caudal. The anal is tinged 

 with orange. 



A single specimen, eleven inches long, is in the collection. 



Trichidion approximans Gill ex. L. and B. 

 One specimen. 



Family MUGILOID^E. 

 Genns MUGIL (Linn). 



From this genus, I would exclude the Mugil proboscidcus of Giinther and the 

 M. corsula of H. Buchanan. The former is the type of a genus which may be 

 called Chxnomugil, and distinguished by the longitudinal cleft of the mouth, 

 the narrow and pointed lower jaw and the thick and angular upper lip. Two 

 species are known to me. To the Mugil corsula can be given the new generic 

 designation of Rhinomugil corsula ; it is distinguished by the projecting rounded 

 snout and the lateral position of the nostrils. 



MtJGIL GUENTHERII Gill. 



The height enters 5 times in the total length ; the head 5 times ; the caudal 

 4, and its median rays 7. The interorbital space and snout are little convex 

 transversely ; the eye has a posterior membrane covering the iris and hind part 

 of pupil, and an anterior covering the iris; the diameter equals a fifth of the 

 head's length, and is less than the snout. The lips are rather thin. A deep 

 groove is in front of the vomer. The upper labial teeth are very conspicuous. 

 The snout, which is longer than the eye, does not project beyond the mouth. 

 The preorbital is narrowed and obliquely rounded behind, leaving a narrow 

 line of the maxillary exposed. The dorsal fins are nearly equal in height, 

 and contained twice in the head's length ; the second as long as high ; 

 the origin of the first is nearer the snout than the base of the caudal fin, 

 and above the twelfth scale; the second above the twenty-fourth scale of the 

 lateral line. The pectoral fin is contained l times in the length of the head 

 and extends to the eleventh scale of the lateral line. The tip of the ventral is 

 halfway between its base and the anus. The anal is longer and higher than 

 the second dorsal and longer than high; it commences in advance of the second 

 dorsal. All the fins are scaleless. 



D. IV. 1. 8. A. III. 9. 



Scales 1. 1. 38. Longitudinal rows 13. 



The base of the pectoral is blackish. One specimen about ten inches long. 

 To Dr. Giinther we are indebted for the better elucidation of the numerous 

 species of Mugil. 



1863.] 13 



