EIGENMANN : FRESH WATER FISHES. 327 



6. Trinidad Province. 



The fauna of Trinidad is of peculiar interest. Trinidad is an island 

 off the delta of the Orinoco, approximately 40 by 50 miles. Its geograph- 

 ical affinity is with Venezuela rather than with Guiana. Its fresh-water 

 fauna consists of three elements : 



1. West Indian, 16+ per cent, (about). This element consists chiefly of 

 members of the Gobiidae which enter fresh water throughout tropical 

 America. 



2. Amazonian, 33 per cent. This element consists, with few excep- 

 tions, of species ranging from the La Plata basin to Trinidad. The ex- 

 ceptions are found in the Amazon and Trinidad. All are marked A. 



3. Autochthonous, 33 per cent. This element consists either of local 

 adaptations, *, of genera with a very wide distribution, or of distinct 

 genera marked **. 



Me Selenaspis herzbergii (Bloch). Trinidad to Brazil. 



Me Tachisurus laticeps Gunther. British Guiana, Trinidad. 



A RJianidia sebce kneri Steindachner. Paraguay to Trinidad. 



* Psendanchenipteriis gitppyi (Regan). Trinidad. 



* Trachycorystes pasece (Regan). Trinidad. 



A Aucistrits cirrhosiis Cuvier & Valenciennes. Rio Grande do Sul to 

 Trinidad. 



* Hemiancistrtis trinitatis (Gunther). Trinidad. 



A Plecostonms robinii Cuvier & Valenciennes. La Plata to Trinidad. 

 A Plecostomits plecostonms (Linnaeus). Eastern South America. 

 A CallicJithys callichtJiys (Linnaeus). La Plata to Trinidad. 

 A Hoplosternmn littorale Hancock. La Plata to Trinidad. 

 A Hoplosterniim thoracatiim (Cuvier & Valenciennes). Eastern South 

 America. 



* Corydoras ccneus Gill. Trinidad. 



A Hoplias nialabaricits (Bloch). La Plata to Magdalena. 

 A Hoplerythrinus nnitcvniatits (Spix). La Plata to Trinidad. 



* Curiniatus argenteus Gill. Trinidad. 



* Odontostilbe pidclier (Gill). Trinidad. 



A Heniigranunus unilineatits Gill. Trinidad to Bahia. 



* Hemibrycon tceniuriis (Gill). Trinidad. 



* Hemibrycon gtippyi [KegdiXi). Trinidad. 



