396 Dr. J. Gwyn Jeffreys on Mediterranean Mollusca. 



T. Adansoni, Payraudeau. T. Montacuti, W. Wood. 



T. striatus, L. T. exasperatus, Peiin. 

 Clanculus cruciatus, L. 

 Turbo rugosus, L. T. sanguineus, L. 

 Bissoa cimeXy L. B. calathus, Forb. & Hani. B. reticulata, 



Mont. B. cimicoides, Forb. B. zetlandica, Mont. R. 



TestcBy Aradas. B.punctura, Mont. B. variabilis, v. Miihl- 



feldt. B. costulata, Alder. B. pulchella, Ph. B. incon- 



spicua, Aid. B. obtusa, Cantraine. 



Jtissoa concinnata *, Jeffreys. (PI. XVI. fig. 2.) 



Shell forming a short cylinder, moderately solid, semi- 

 transparent, and glossy : sculpture, none except some slight 

 and remote lines of growth on the last whorl : colour 

 whitish : spire extended ; apex blunt : whorls 4, convex, 

 gradually enlarging ; top whorl regular : suture deep : 

 mouth nearly round : outer lip sharp : inner lip adhering to 

 the lower part of the periphery : umbilicus shallow, but 

 imperforate. L. 0*03, B. 0'02. 



About sixty specimens. This differs from it. obtusa of 

 Cantraine not only in its much smaller size, but in its 

 cylindrical shape, the absence of spiral stride, and the deeper 

 suture. 



Bissoina decussata, Mont. 



Jeffrey sia cylindrica, Jeffr. 



Vermetus semisur rectus , Bivona. 



Turritella terebra, L., var. gracilis. T. pusilla, Jeffr. 



Scalaria Cantrainei, Weinkauff. 8. pulchella, Biv. 



Aclis ascaris, Turt. 



Aclis attenuans f, Jeffreys. (PL XVI. fig. 3.) 



Shell forming an elongated cone, thin, semitransparent, 

 and glossy : sculpture, none : colour clear white : spire 

 gradually tapering to a rather fine point : whorls 6-7, con- 

 vex; the last ; with the mouth upwards, equals the rest of 

 the shell ; first whorl globular : suture well defined but not- 

 deep, nearly straight : mouth projecting, more round than 

 oval and inclined to squarish, contracted above and effuse 

 or spread out below ; the base is entire and not sinuous or 

 notched : outer lip sharp-edged, expanding : inner lip or 

 pillar curved, somewhat reflected and thickened behind, 

 where there is a slight chink but no perforation. L. O05, 



B. 0-03. 



Ten specimens. A. Gulsonce is its nearest ally ; but that 



* Fitly joined together. t Lessening. 



