CYCLOSTREMA. 251 



8. Beani (pi. 255, f. 25), Fisc/i. — Testa crassiuscula, compla- 

 nata, orbicularis, alba, late umbilicata, supra concentrice et valide 

 costata (costis 5), subtus iiitida, obsolete sulcata, compressa, con- 

 cava ; anfractibus 4|, subplanulatis, ultimo acute bicarinato, 

 inter carinas lsevi; apertura rotunda; margine dextro arcuato, 

 supra minute sulcato, infra angulato. Obs. A singular species, 

 described by M. Fischer from Guadeloupe, with the peripheral 

 keel, causing an angular projection at the lower part of the 

 peritreme. 



9. Verreauxii (pi. 255, f. 17, 18), Flsch. — Testa crassiuscula, 

 complanata, discoidea, alba, nitida, late umbilicata, concentrice 

 minute sulcata ; anfractibus 4, subplanulatis, ultimo permagno 

 dilatato, cariuis tribus munito, 1 superiore, 1 media, area plana 

 separatis, et 1 inferiore minore ; apertura rotundata, transversa ; 

 margine dextro elongato, earinis productis tricuspidato, subin- 

 crassato. Obs. This species is remarkable for the points of the 

 peristome, which are formed by the prolongation of the keels, aud 

 which cause it to somewhat resemble in form the genus Teino- 

 stoma. 



10. tornata (pi. 255, f. 19, 20), A. Ad. Testa orbicularis, 

 turbinato-discoidea; spira elatiuscuM; anfractibus convexis, cos- 

 tellis concentricis elevatis sequidistantibus ornatis ; interstitiis sim- 

 plieibus; suturis profundis; umbilico profundo. Obs. This 

 species very closely resembles in sculpture and general appear- 

 auce C. sulcata (f. 11, 12), but its form is different, the spire 

 being more elevated, the whorls more rounded, and the umbilicus 

 smaller. 



11. Schrammi (pi. 255, f. 26), Fisch. — Testa planorboidea, 

 compressa, orbicularis, corneo-alba, aperte umbilicata; costis ra- 

 diantibus validis; carina mediaua insertione costarum cristata, et 

 earinis 2 (1 superiore, 1 inferiore, obsolete nodosis) ornata; an- 

 fractibus 3 ; apertura rotundata ; margine dextro acuto. Obs. 

 This species has the aspect of a small Ammonite, or a Planorbis 

 cristatus, with three rows of spines. 



12. cingulata (pi. 255, f. 23, 24), Dkr. — Testa subdiscoidea, 

 lactea, umbilicata; spira depressa, anfractibas quaternis, subito 

 crescentibus, tricarinatis instructa; sutura, incisa; apertura sub- 

 rotuudata. Obs. A very neatly formed carinate species, figured 

 from a specimen obtained by the author in Japan, and which 

 seems to represent very nearly the figure of C. angulala figured 

 by Dr. Dunker in his ' Mollusca Japonica.' 



13. excavata (pi. 255, f. 15, 16), Cpr. — Testa orbiculato- 



