210 M. C. Mereschkowsky on some 



served in the Crimea or in the Caucasus that has not also 

 been observed by me in the Arctic regions of Northern Russia. 

 Thus the law that the marine Infusoria of different seas differ 

 much more than tlie freshwater Infusoria of different coun- 

 tries finds a new confirmation in the Infusorial fauna of the 

 Black Sea. 



All the other laws of the geographical distribution of the 

 Infusoria established by me in the memoir above mentioned 

 are likewise daily finding fresh confirmations ; and I believe 

 tliere is little change to be expected in this respect when the 

 distribution of this class of organisms shall be studied with 

 the same zeal and attention that is devoted to other classes. 



I will now pass to the description of the new species. 



Coihurriia pontica. (PI. XII. figs. 4-6.) 



Diagn. Concha superficie undulata insidet pediculo brevi ; 

 urceiformis, duobus rostris munita. Animal insidet pediculo 

 triangularis intus excavato. 



Loc. Black Sea, Crimea, Livadia. 



Descr. This is one of the prettiest species that I have ever 

 seen of this genus, the forms of which are so numerous. The 

 carapace has a very graceful pitcher-shape with the edges 

 slightly turned out, and with two sides of the margin more 

 elevated than the rest, which especially aids to give an elegant 

 appearance to the whole animal. The surface of the carapace 

 is not even, but covered with four or five not very strongly 

 marked circular elevations. The carapace has scarcely any 

 pedicle ; it might therefore be placed among the sessile species; 

 the little that can be taken for a peduncle is only the attenu- 

 ated part of the base of the carapace, enclosing the peduncle 

 of the animal itself, as is well shown in the figure (fig. 5). 

 The peduncle of the animal is formed by an inferior small 

 pad, which is perfectly solid, and a conical peduncle with its 

 widest part turned upwards, where it is attached to the 

 animal. This peduncle is not solid like the pad which serves 

 as its base, but furnished with a cavity of the same conical 

 form as the peduncle itself. 



As to the animal, I have only seen its remains, already in a 

 state of putrefaction. The carapace was attached to a Flori- 

 dean Alga, apparently belonging to the genus Ceramium^ 

 which I found upon the shore of the Black Sea near Talta. 

 The total length of the animal, or, more properly of the 

 carapace, is 0*0171 millim., its breath is 0'007 millim. 



Gothurnia socmlis, A. Gruber. (PI. XII. fig. 3.) 

 Loc. White Sea, Solowetzk Islands, at a depth of 2 metres. 



