68 PROCEEDINGS OP THE ACADEMY OP 



Caulolatilus chrysops Gill, Phil. 1862, 340. 

 Hab. West Indies. 

 D. vii. (-viii.) 24. A. i. (-ii.) 22. C. v. 1, 7, 6, 1, v. P. 18. V. I. 5. 



Caulolatilus affinis Gill. 



In a young specimen the following peculiarities are exhibited : 



The profile describes the outline of a quadrant, and in front is almost ver- 

 tical. The greatest height is contained less than four times (*27) in the 

 length, exclusive of caudal ; that of the caudal peduncle about nine times. 

 The head forms more than three-tenths of the length, while its height 

 bears to its length the proportion of 22 : 31. The diameter of the eye equals 

 almost half the height of the head. The preorbital is very narrow. The 

 teeth of the preoperculum are strong and distant, and those of the middle di- 

 rected obliquely upwards. The sixth dorsal spine equals a, ninth of the 

 length. The anus is behind the middle of the length. The caudal rather ex- 

 ceeds the height of the head. The pectoral equals a fifth of the length ; the 

 ventral is shorter ("18,) and is inserted beneath the base of the pectoral, its 

 spine being at the vertical of the upper axil. 



D. vii. 25. A. ii. 22. P. 18. 



The color is reddish brown on the head and back, lighter on the sides. A 

 very distinct blackish spot is present above the axilla of the pectoral. 



This species is very closely related to C. chrysops, but the single individual 

 which is a young one about three inches long, differs from adults of the latter, 

 of which I have seen none less than fifteen inches long, by the greater height 

 of the spinous dorsal and the proportions of the other fins, and the situation 

 of the ventrals, strongly serrated preoperculum, as well as as the large eyes 

 and narrow preorbital. The last two characteristics are doubtless those of 

 youth. The value of the others yet remains to be ascertained, but it is pro- 

 hable that they will be found to be specific, although, perhaps, slightly modi- 

 fied with age. The species has been known to me for three years, but I have 

 felt reluctant to^describe from so small a specimen. The specimen was ob- 

 tained by Mr. Xantus at Cape St. Lucas. 



Caulolatilus anomalus. 



Dekaya anomala Cooper, Proc. California Academy Natural Sciences, vol. iii. 

 p. 71, fig. 17, 1864. 



Hab. Catalina Island, California. 



D. viii. 25. A. ii. 25. P. 18. 



Sq. 135 140-1 5 pm, 



Caulolatilus anomalus is very closely related to the C. princeps of the Gala- 

 pagos Archipelago, but appears to differ in the more elongated spines of the 

 dorsal fin, as well as the longer pectoral and ventral fins. A critical compari- 

 son of fresh or wet specimens of both species is, however, requisite not only 

 to verify the differences 'referred to, but to ascertain the other differential 

 characters. It is scarcely probable that the two forms are co-specific, but at 

 the same time we must remember that at least one species is common to 

 Lower California and the Galapagos Islands. 



The type specimen of C. anomalus was kindly forwarded for examination 

 by Dr. Cooper, the discoverer. It is an adult, and belongs to the collection 

 of the Geological Survey of the State of California. 



Caulolatilus princeps. 



Latilus princeps Jenyvs, Fishes Beagle, 52, pi. 11. Gthr., ii. 253. 

 Hab. Galapagos Islands (Chatham Island.) 



[April, 



