122 



derived from it saying : " Hg who once eats Cascaludou must die 

 in Trinidad" or words to that effect. The Callichthys belongs to 

 those fishes that can live in the mud with very little water. 



3. The ponds that are generally dug out on estates to form 

 reservoirs during the dry season are thickly over-grown with 

 water plants, grasses etc. Their fauna is recruited from the 

 other two forms of water, but naturally those that have not any 

 organs to contend against strong currents thrive best here. 

 Whatever forms occur here are present in large numbers as 

 there is no chance of their distributing themselves widely. 

 With the exception of a small alligator or a large Ameiva, one 

 finds the same type of animals as in Europe. The ponds are 

 the Eldorado of the tadpoles which occur in large numbers ; 

 there are many kinds of insect larvse such as dragon flies, ^grnc>7», 

 j^sclina, Epliemera. gnat larva? and pupae. Many kinds of 

 water snails are also seen as Planorbis, Fhysa, Ancylus, small 

 Cyclas and Fisido", their well known parasite, Glimtogaster 

 Limnm, or at any rate a species very similar to it is 

 also found. Hydra viridis and fusca also unexpectedly strike 

 the eye. I cannot find any specific differences between the 

 Trinidad Hydra and the European ones, although they are 

 larger than the Trinidad kinds. It is a strange fact that the 

 inferior Trinidad sweet water fauna as far as I have known con- 

 sists of smaller specimens than the corresponding European 

 specimens. Among the lihabdocwlons Turhellarki I found 

 representatives of the genera Mcsostomum, 3licrostomum, 

 Trorhynclius and several others.. There are several kinds of 

 Annelldes which belong to the genus Dero. 1\\& Hirundlnea are 

 represented only by the genus Clepsine, Avhich like their 

 Eiiropean cousins carry their brood on their ventral surface. 

 Amongst the Microscopic animals the Botatan'a, Daphm'des 

 and Cydop>s etc , were not wanting. 



F. W. URICH. 

 4th November. 



(To he Continued.) 



