60 REV. H. B. TRISTRAM ON FRESHWATER SHELLS [Jan, 27, 



are six or seven rather strong teeth in each maxillary, and ten in each 

 mandible. Eye rather small, two-fifths of the length of the snout. 



Total length 43 inches. 



If we divide the Colubri with equal or subequal teeth into the 

 subgeneric divisions of Coluber, Elaphis, Cynophis, Spilotes, and 

 Coryphodon, as indicated in my ' Catalogue of Colubrine Snakes/ 

 p. 84, the present species does not enter any of these sections ; and 

 we may propose the name of Lielaphis for a sixth group, of which 

 C. holochrous is the type, and to which also Spilotes samarensis, 

 Peters, belongs. Its characters would be : — Rostral moderate ; body 

 and tail rather elongate and compressed ; two anterior and two poste- 

 rior oculars. Scales smooth. Teeth subequal, in small number. 



7. Note on some Freshwater Shells sent from Madagas- 

 car BY J. Caldwell, Esq. By the Rev. H. B. Tristram, 

 CoRR. Memb. 



A small parcel of freshwater shells sent by Mr. Caldwell from 

 Madagascar, and entrusted to me for examination by Dr. Sclater, 

 contains examples of six species, four of which appear to be hitherto 

 undescribed. 



1. PiRENA spiNOSA, Rccvc. Subgenus Melanatria of Bowdich. 

 Found at Renomafana, Madagascar. 



2. Amptjllaria adusta. Reeve. 

 sordida, Sowerby, iii. pi. 143. 



Given by Reeve without locality, but conjectured to be from Bor- 

 neo ; Renomafana, Madagascar. 



3. Physa (subgenus Ameria, H. Adams) lirata, n. sp. 



Testa truncato-ovata,hrevis, tenuis, fusca; spira omnino truncata ; 

 avfractus 3, liris continuis valde et conferte ornati tnodo testes 

 Harpse; sutura lirofunda ; apertura subovalis, intus lirata, infra 

 expansa ; peritrema continuum ; plica columellaris conspicua. 



Shell truncate-ovate, short, fragile, brown ; spire quite truncated ; 

 whorls three, strongly and thickly ornamented with continuous ridges, 

 like the harp-shell ; suture deep ; aperture subovate, liratcd on its 

 inner fold, and expanded below ; peristome continuous, columellar 

 fold distinct. 



Long. 4i lin. ; diam. 3i lin. 



Hab. Two days west of Antananarivo, ^Madagascar. 



This shell, while by its flattened spire and angulated posterior 



