194 r CATALOGUE OF FISHES OF TORTUGAS 277 



The larger specimen secured, which now is 350 mm. long, is the basis for the 

 following proportions and enumerations: Head in total length 4.8; depth 6.35. 

 Eye in head 5.2; snout 4.3; interorbital 5.5; maxillary 2.0; pectoral 2.0. D. about 

 80; A. about 70, both confluent with the caudal; scales very small, about 220; gill 

 rakers 3, and several rudiments. The color in alcohol remains brownish, as in 

 life, and the vertical fins have black margins. 



West Indies to Florida. S. F. H. 



Dinematichthys Bleeker 



Dinematichthys Bleeker, Natuurk. Tijdschr. Ned. Ind., vol. 8, 1S55, p. 318 (D. iluocoe- 



teoides Bleeker). 

 Ogilbia Jordan and Evermann, in Evermann and Kendall, Bull. U. S. Fish Comm., vol. 



17, 1897 (1898), p. 132 (O. cayorum Evermann and Kendall). 



Because characteristic male organs were wanting in the type of a new species 

 of fish from Key West, on which the investigators made no determination of 

 maleness; because it had fewer fin rays than East Indian Dinematichthys; and 

 perhaps because Brosmophycis ventralis Gill, of the west coast of Mexico, had 

 much the same number of fin rays as the Atlantic form and like it seemed to lack 

 "claspers," Jordan and Evermann erected the genus Ogilbia to receive the two. 

 But both Ogilbia cayorum Evermann and Kendall and O. ventralis (Gill) are 

 sexually dimorphic. In none save minute details do the genitalia of their males 

 differ from those of males of D. iluocoeteoides (Brit. Mus. no. 62.2.28.65, Bleeker's 

 collection). Until additional generic differences are found, or its segregation on 

 differences in fin formulas alone is approved, Ogilbia may be referred to 

 synonymy. W. H. L. 



Dinematichthys cayorum (Evermann and Kendall) 



Ogilbia cayorum Evermann and Kendall, Bull. U. S. Fish Comm., vol. 17, 1897 (1898), 



p. 133, pi. 9, fig. 14 — Key West, Florida. 

 Brosmophycis verrillii Garman, Trans. Connecticut Acad. Sci., vol. 10, 1900, p. 511 — 



Bailey Bay, Bermuda. 



This species is rare in museums, but may be found at Tortugas without diffi- 

 culty under dead corals in tide pools, or near low-water mark, on Bird Key reef, 

 though by no means limited to that locality. 



In 6 specimens the dorsal fin supports varied from 69 to 72, the anal from 52 to 

 55. Evermann and Kendall misconceived the structure of the ventral fin, as the 

 2 rays mentioned by them include both fins, which are close together and thread- 

 like. 



It is viviparous, the breeding season including the latter part of June, with 

 limits unknown. Females at 50 mm. are capable of bearing young, and on several 

 occasions gave birth to broods of 3 to 5 while on the way to the laboratory from 

 Fort Jefferson moat or Bird Key reef in the collectors' pails. 



The young are hardy, of a length of 15 mm., swimming about actively from 

 the first with the parent, or hiding with her or with other adults beneath pebbles. 

 Their bodies are transparent and colorless, except for a broad dusky stripe on the 



