462 



SUPPLEMENT. 



MoNOPTiGMA (melanioides) Lea = M. striata, Gray (name only.) 

 Shell like Chemnitzia, rather fusiform, spirally grooved ; columella slightly 

 folded, with a sinus at the base. Diatr. 12 sp. ludo-Pacific, (p. 126). 



Menestho, Moller, (Tiu'bo albulus, Fabr. Greenland) v. Chemnitzia. 



Adis (p. 132) ascaris, Turt. (= A. supra-nitida, Wood) has the apex 

 sinistral, like the Pyramidellidae. 



Vicarya (Verneuili) D'Arch. 1854. Hocene. Scinde. Shell like Potamides ; 

 aperture with a broad callosity spreading over the body whirl, outer lip with 

 a deep narrow sinus like ClwieUa. 



Holopella, Mc Coy, Turritella obsoleta, Sby. U, Silurian. Brit. Peristome 

 entire, not produced in front. 



Scoliostoma (Dannenbergii) Max. Braun, 1838. Syn. Cochlearia, F. 

 Braun, 1841. Shell turreted, sometimes sinistral, whiris keeled or rounded, 

 aperture more or less twisted, trumpet shaped, sometimes with a wadely 

 expanded outer peristome. Tossil. Devonian— Trias. Em'ope. 



Amnicola, Gould and Haldemann, 1841 (p. 131) = Paludina porata. 

 Say, inhabits the fresh waters of New England, gregarious on stones and 

 submerged plants. The species are numerous. 



Paludomus, Sw. Shell turbinated, smooth or coronated; outer lip 

 crenulated ; olivaceous, with dark brown spiral lines. Bistr. 24 sp. Hima- 

 laya, Bombay, Ceylon, Seychelles. This genus was founded on Melania conica 

 and two other Indian species, having a concentric operculum, like Paludina. 

 In Reeve's monograph it was made to include, primarily, a group of Cingalese 

 shells for which Mr. Edgar Layard has revived Gray's MS. name Tanalia. 

 The description at p. 131. applies to this latter group. 



Petaloconchus (sculpturatus) Lea, 1843. Sub-genus of Vermetus, 

 p. 133. Miocene, U.S., St. Domingo, S. Europe. Shell with two internal 

 ridges, running spiraUy along the columella, becoming obsolete near the apex 

 and aperture. 



Biscohelix (calculiformis) Dunker, 1851. Lias, Gottingen. This name 

 was proposed for the depressed Euomfhali of the Lower Oolites, of which 

 there are several species in Normandy and England. SheU usually sinistral, 

 flat or concave above, aperture quadrangular. 



Platystoma (Suessi) Homes, 1855^. Trias, Hallstadt. Shell discoidal, 

 smistral? sculptured; peristome suddenly expanded, plain ; aperture %vith an 

 inner rim, circular, and deflected (upwards,) at right angles to the plane of 

 the shell. Several examples have occurred. 



BiFRONTiA, Desh. p. 135. B. Zanclaa, Phi. has been dredged alive off- 

 Madeira, by Mr. Mc Andrew, the operculum is like Torinia (fig. 82) from 

 which the sheU diff'ers only in being more depressed. 



Philippia (lutea) Gray, has a nuilti-spiral operculum, and the animal is 

 like Trochus. (Philippi.) 



Paludestkina (lapidum) D'Orb. part. Presh-waters of S. America. 



