58 Sowerby on several new 



the middle of its volutions ; 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 the lip 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- 

 tincto : umbilico parvo. Axis T 3 r , 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. 

 8 is common at Porto Santo : the latter shell differs 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 lninute species that we cannot be quite certain of its 

 characters. 



Art. VIII. Descriptions, accompanied by figures, of se- 

 veral new species of Shells. By G. B. So we h by, F. L. S. 



1. Bulimus iosloma ; Testa oblongiuscula, spira breviuscula, 

 obtusa, an r ractibus quinque subventricosis, leviter striatis, subvio- 

 lascente-griseis ; apertura oblonga, longitudine spiram aequante, 

 intus pallide violacea, peristomate incrassato, reflexo, contiuuo, 

 violaceo : aufractu ultimo parte inferiore intus saturate castaneo. 

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



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 within. Peristome thickened, reflected, cortti- 



