452 succixEiD.ii. 



rugosa, niticle fulvesceiite ; spira brevissima ; aufr. 2|, ultimo 

 inflato; apertura ovali, margiue sinistro valde ai'cuato; perist. 

 simpliee, membranaoeo. 



"Long. 14, cliam. 10 mill." {Pfelfer.) 



Bab. ludia : Pondicherri {Gueriii). 



Ouly known from the description and figure. I have not seen 

 any shells which can be referred to this species. 



448. Succinea semiserica, Gould. \ 



Succinea semiserica, Gould, Proc. Boston Sec. Xat. Hist, ii, 184G, 

 p. 100; Pfeitfer, Mon. Helic. Viv. iii, 1853, p. 10; iv, 1859, 

 p. 805 ; Gould, Otia Conch. 186i\ p. 199 ; Hanlev & Theobald, 

 Conch. Ind. 1874, pi. 67, tigs. 2, 3 : Nevill, Pland List, i, 1878, 

 p. 212. 



Succinea semisericeaj Reeve, Conch. Icon, xviii, 1872, Succinea, 

 pi. 2, tig-. 9. 



Succinea {Brachyspira) semiserica, Pfeift'er & Clessiu, Nomencl. 

 Helic. Viv. 1881, p. 410. 



Original description : — " Testa fragilis, ovalis, a tergo depressa, 

 postice straminea, antice albido-sericea, lougitudinaliter plicoso- 

 striata ; anfr. 2\, ultimo maximo ; apertura ovata, patula, faciem 

 infe riorum fere adetjuante. 



"Long, h [ = 12'7o mm.]; lat. j^'^^y [ = 7'6 mm.]; alt. ^-^^ poll. 

 [=3-8 mm.]." (Gould.) 



Bah. Burma : Tavoy {Goidd) ; Rangoon, Moulmain {Stoliczka) ; 

 Cliittagong (if«&f«i.) ; Pegu {Theobald); Mergiii {Mus. Brit.). 



" Its shape is like S. tigrina, Fer., and it is well characterized 

 by the peculiar silky-white or pearly surface of the anterior half 

 of the shell." (Gould.) 



Nevill considered >S. j^Hcata, Blanford. and perhaps S. haconi, 

 Pfeiffer, cospecific with semiserica. The three forms are, however, 

 quite distinct. Tiie present species has an extremely short spire 

 and is finely, distantly ribbed. Owing to a deficiency of calcareous 

 matter the shell is very brittle. This applies especially to some 

 shells from Rangoon, in the Theobald collection, which are 

 labelled S. rangoonensis — a name never published — but which 

 pertain to the present species ; they are extremely thin, almost 

 transparent, and of a fuscous corneous colour. Their dimensions 

 exceed those given by Gould, i.e. 15x9x3. Three specimens 

 from Pegu, in the Theobald collection, are pale greenish corneous. 

 The Cuming collection comprises shells from Tavoy measuring 

 14 X 8 X 3-5 mm., which therefore also exceed Gould's type in 

 size ; on the other hand, there are specimens from Mergui in the 

 general collection of the British Museum which attain a size only 

 of 8 X 4-5 X 2 nnn. 



449. Succinea baconi, Pfeiffer. 



Succinea baconi, Pfeiffer, P. Z. S. 1854, p. 298; ibid., Mon. Helic. 

 Yiv. iv, 1859, p. 804 ; Reeve, Couch. Icon, xviii, 1872, Succinea, 



