136 



Sinus lachrymales exigui, distincti. 

 Fossa interdigitales nullae. 

 Folliculi inguinales exigxii. 

 Mamma duse. 

 Typus est Ixalus Prohaton, Proc. Zool. Soc, Part IV. page 119. 



"The genus Ixalus, founded upon the obsen'ation of a single spe- 

 cimen, may eventually prove to belong to a different family ; it differs 

 little, indeed, from the true Antelopes : but even supposing it to 

 be correctly placed among the Moschida, other forms are still want- 

 ing to fill up the chasms which evidently exist among the characters 

 of that group. Two are more especially indicated, and our know- 

 ledge of the laws of organic combination and of the constituent parts 

 of other groups, gives us every reason to believe in their actual 

 existence, and to anticipate their discovery. They will be character- 

 ized nearly as follows, and will probably be found, one in the tropical 

 forests of the Indian Archipelago, and the other on the elevated table 

 lands of Mexico or South America. 



HiNNULUS. 



Rhinaria magna. 

 Sinus lachrymales distincti. 

 Fossa interdigitales nullae. 

 Folliculi inguinales nulli. 

 Mamma quatuor. 



Capkeolus. 

 Rhinaria nulla. 

 Sinus lachrymales nulli. 

 Fossa interdigitales parvae } 

 Folliculi inguinales ? 

 Mamma duse. 



" It may appear a bold, perhaps a presumptuous undertaking, thus 

 to predict the discovery of species, and define the characters of 

 genera, of whose actual existence we have no positive knowledge ; 

 but, as already remarked, all the analogies of nature, whether derived 

 from organic combination or from the constituent members of similar 

 groups, are in favour of the supposition ; and I may observe further, 

 that the recent discovery of the genus Ixalus, if indeed it eventually 

 prove to be a genus, of which I had long previously defined the 

 characters, as I have here done for the presumed genera Hinnulus 

 and Capreolus, strengthens my belief in the actual existence of these 

 forms, and increases the probability of their future discovery. 



Fam. IV. Caprid^. 



Pedes bisulci; cornua cava, persistentia ; rhinaria nulla; denies 

 primores supra nulli, infra octo. 



