FAMILY BROTtJLIDAE — SCHXJLTZ 385 



organ. I have experienced much difficulty in diagnosing the genera 

 recognized, largely because of inadequate descriptions and figures, 

 and because of the lack of specimens of certain Australian genera. 

 At least three phyletic lines are more or less indicated by body form: 

 One, represented by the genus Dinematichthys, in which the body is 

 robust, so that the dorsal and ventral contours of the body are convex 

 between the caudal fin base and a point a head length anterior to it; 

 a second, containing the blind genera, which are also somewhat robust, 

 but in which the dorsal and ventral contours are nearly straight and 

 the body more slender in that region; and a third, represented by a 

 group of genera with slender bodies, centering around Brosomophycis , 

 in which the dorsal and ventral contours of the body are slightly con- 

 cave in that region. To this latter group I refer the new genus and 

 probably the genera Monothrix and Dermatopsis. These differences 

 are not very clear cut but are sufficiently distinct to indicate difl'er- 

 ences in body form among the genera. Brosmophyciops differs from 

 all other genera in the subfamily Brosmophycmae in having the maxil- 

 lary concealed when the mouth is closed. The following key to the 

 genera of Brosmophycinae with caudal fin separate from dorsal and 

 anal fins, and with males having a spiny copulatory organ, is tenta- 

 tive, but it should enable the separation of the various genera related 

 to the new genus: 



la. Blind, eyes not visible externally Lucifuga '^ Poey 



Stygicola Gill 

 Typhlias Hubbs 

 lb. Eyes normally developed, visible externally. 



2a. Gill rakers all tuberculate, none at angle of first gill arch distinctly elon- 

 gate; scales imbricate, at least posteriorly; opercular spines 2, lower 

 one very short, concealed; dorsal rays about 102 or 103; anal about 

 78 to 86 Monothrix " Ogilby 



2a. At least one gill raker at angle and two more next to it on lower part of first 

 gill arch, notably longer than others, which are tuberculate. 

 3a. Scales not imbricate, rudimentary, distinctly separated from each 

 other Derinatopsis ^° Ogilby 



1' Lucifuga Poey, Memorias sobre la hlstorla natural de la Isla de Cuba, vol. 2, p. 95, ISfiO (type species, L. 

 auMerranus Poey). 

 Stygicola Gill, Proc. Acad. Nat. Scl. Philadelphia, vol. 15, p. 252, 1863 (type species, Lucifuga dentatus 



Poey) . 

 Typhlias Hubbs, Carnegie Inst. Washington Publ. No. 491, p. 287, 1938 (type species, T. pearsei Hubbs). 



" Monoihrix Ogilby, Proc. Linn. Soc. New South Wales, vol. 22, p. 87, 1897 (type species, M. polylepsis 

 Ogilby).— Whitley, Rec. Austr. Mus., vol. 19, p. 241, fig. 9, 1935. 



Diagnosis based on descriptions only. On the basis of their having tuberculate gill ralcers, Dermatopsis 

 maltiradiatut McCulloch and Waite (Rec. South Australian Mas., vol. 1, p. 63, pi. 5, fig. 4, 1918) and Derma- 

 topsis kasougae Smith (Trans. Roy. Soc. South Africa, vol. 30, p. 72, fig. 3, 1943) are with much uncertainty 

 referred to this genus. 



" Dermatopsis OgUby, Proc. Linn. Soc. New South Wales, vol. 21, p. 138, 1896 (type species, D. macrodon 

 OgUby).— Whitley, Rec. Austr. Mus., vol. 19, p. 239, 1935. 



Diagnosis based on description only. 



