810 AMERICAN JOURNAL 



fore, place it provisionally in the Plianej'opneumona, in a sepa- 

 rate order from the Rhipidoglossal mollusks allied to Cyclostoma 

 and HellGina. 



Hyalina alieea and Blandiella reclusa have hitherto only been 

 found on the Oropuche mountains. 



BuLiMiNus PiLOSUS, n. sp, Plate 17, fig. 9. 



Shell oblong conic, rather thin ; horny-brown-colored, cov- 

 ered with a fine, but not very close pubescence ; whorls about 

 6, rather ventricose, and separated by a deep suture, the last 

 whorl forming nearly two-thirds of the length of the shell; 

 apex obtuse ; aperture oval, slightly oblique ; peristome acute, 

 columella broadly reflected over the deep umbilicus. Length 

 14 mill., breadth 7 mill., height of aperture 6 mill. 



This species (which I refer to the same genus as B. montanus 

 and B. obscurus) is related to a form collected in Venezuelan 

 Guiana by Mr. -Tate, and, so far as I know, undescribed as yet. 

 But the latter has a very close pubescence, arranged in fine 

 spiral lines. It is also larger, and its peristome is thickened 

 and everted, a feature I have not observed in our shell. The 

 Venezuelan shell forms a white calcareous epiphragm. The 

 only species of d'Orbigny's which bear any resemblance to B. 

 pilosus are B. crepundia and B. trichodes, whose proportions are 

 much more elongate. 



The genus BuUminus does not seem to be represented in the 

 West Indies, unless the shell now described, and that from Do- 

 minica, named by me B. stenogyroides, should prove to belong to 

 it, which I think probable. 



Planorbis meniscus, n. sp. 



Shell depressed, brownish horn-colored, diaphanous, gently 

 convex above ; apex sunk, base slightly concave ; whorls about 

 5, rounded above, flattened beneath ; aperture nearly semilunate, 

 its basal margin nearly straight, owing to the flattening of the 

 whorls. 



The Planorbis now described approaches nearest to P. parop- 

 seides, a species described by d'Orbigny, from South America. 

 In the form of the whorls and aperture, there is much resem- 

 blance between these species, but ours differs in being larger and 

 thicker. My largest specimen measures 6 mill, in extreme width, 

 and its greatest thickness (= height of last whorl) is 1^ mill. 



Chatham River, Erin., Trinidad. 



