pS Sowerby on several new 



the middle of its Tolutious ; the upper part or spire is rounded ; 

 volutions six to seven, slightly striated ; keel in the middle, turned 

 down ; lower part umbilicated, rather depressed, volution round- 

 ed, granulated ; aperture subquadrate, a little elongated : lower 

 part of tlie Up rather spread and turned downwards. 



7. Helix bicarinata ; testa subglobosa, spira breviuscula, subco- 

 nica ; aufractibus quinque quadratis, mediane carinis duabus, su- 

 periore obtusiuscula : apertura Integra, rotunda, peristomate dis- 

 .tineto : umbilico parvo. Axis -^j, diam. | unc. Table iii. f. 7. 



A minute species of a rather globular form, with a shortish, 

 slightly conical spire composed of five squarish volutions, having 

 two central carinae, of which the upper one is rather obtuse : aper- 

 ture entire, round, peristome distinct ; umbilicus small. The 

 surface is remarkable for being covered with a granular epidermis. 

 This and another minute species which we have represented at f. 

 Sis common at Porto Santo : the latter shell ditTers from our H. 

 bicarinata in the absence of the keels, and a little in general form 

 — we have not ventured to name it because it so nearly resembles 

 several other minute species that we cannot be quite certain of its 

 characters. 



Art. VIII. Descriptions, accompanied bj/ Jigures, oj' se- 

 veral new species of Shells. By G. B. Sower by, F. L. S. 



1. Bulimus iostoma ; Testa oblongiuscula, spira breviusculS, 

 obtusa, anfractibus quinque subventricosis, leviter striatis, subvio- 

 lascente-griseis ; apertura oblonga, loiigitudine spiram aequante, 

 intus pallide violacea, peristomate incrassato, reflexo, continuo, 

 violaceo : aufractu ultimo parte inferioie intus saturate castaaeo. 

 Axis 2|, diam. 1^ unc. Tab. v, f. i. 



Shell rather oblong, with a shortish, obtuse spire of five some- 

 what ventricose volutions, of a violet grey colour and slightly stri- 

 ated ; aperture oblong, of the same length as the spire, and of a 

 pale violet colour v\i(hin. I'cribfomc tliickencd, reflected, <;onti- 



