320 PBOCEEDINGS OF THE MAIACOLOGICAL SOCIETY, 



29. Anctlus KADiATtJs, Old., var. 



Hal. — " Common locally ia ditches and sluggish streams, below 

 800 feet" (H. H. S.). 



The specimens from Grenada are less elevated than those from 

 St. Vincent. They are also larger apparently, but exhibit similar 

 radiating striae. 



30. Phtsa rivalis (Maton and llackett). 



Hah. — "Ditches and springs below 1,000 feet, pretty common" 

 (H. H. S.). 



31. Tlanorbis HALDEaiANi, C. B. Adauis. PI. XXI, Figs. 21-23. 

 Planorhis Haldemani, C. B. Ad. — Contrib. Conch., vol. i, p. 43 (1849). 



Hab. — Jamaica (Ad.); Trinidad (Cruppy in Brit. Mus.); "ditches 

 below 500 feet, rare" (H. H. S.). 



A Mexican species was described by Dunker under this name in 

 1850, "which is very different from the shells from Grenada and 

 Trinidad. The latter were presented to the British ^Museum by 

 Mr. Guppy, along with specimens of his P. meniscus, which I believe 

 are the same as P. lucidus, Pfr. 



32. Planoebis terveriantjs, D'Orbigny ? 



Planorbis terverianiis, D'Orb. — Ramon dc la Sagra's Hist. Cuba, Moll. 



vol, i, p. 194, pi. xiii, figs. 20-22; Clessin, Conch.-Cab., 



ed. 2, p. 155, pi. xxiii, fig. 5. 



Hah. — Cuba (D'Orbigny); Trinidad (Guppy); " Leeward side near 



St. George's, in mud at bottom of a small ditch, open place, 200 feet" 



(H. H. S.). 



Ten or twelve small specimens may possibly be the young of 

 this species. 



33. PisinnjM PYOJiiEUM (C. B. Adams) ? 

 Cyclaspygmcea, C. B. Adams. — Contrib. Conch., vol. i, p. 44. 

 Piston Adamst, Deshayes. — Cat. Conchif. Brit. Mus., p. 284. 

 Pisidium Jamaicense, Prime. — Mon. Amer. Corbiculadse, 1865, p. 70, 



fig. 76. 



Hah. — Jamaica (C. B. Ad.). Grenada, " still and cold water in 

 shady places below 1,000 feet. Seems to be rare" (H. H. S.). 



Having only a single dead Jamaican specimen to compare with the 

 Gi'cnada shells, this determination may be regarded as doubtful. The 

 present examples, however, correspond fairly well with the above- 

 cited figure of Prime. Some, however, are more pointed behind. 



