of the Piedmontese Coast. 181 



Scissurella. I cannot help thinking the position assigned to this 

 genus by its founder, D'Orbigny, is correct, and not between Adeorbis 

 and lanthina as proposed by the authors of the * British Mollusca.' 

 S. elegans, B'Orb. (S. striatula, Ph.) and var. This species is very 

 variable in form and sculpture, the longitudinal ribs being more or 

 less distinct and partial, and the apex more or less flattened or 

 convex ; but the fine transverse striae are always observable under a 

 lens magnifying four or five diameters. It has not an operculum j 

 but I unfortunately had no microscope with me to examine the 

 animal. I found it plentifully alive in sea-weed at Spezia and 

 Lerici. 



Scissurella cancellata, n. s. PI. II. f. 1. 



Testa orbiculato-depressa, alba, nitidiuscula ; anfractibus 3, rotundis, 

 ultimo costis curvis circa 20 elevatis longitudinalibus, carina fissu- 

 rali interruptis, costellisque totidem transversis decussato ; vertice 

 planato, carina lata acuta subincrassata canaliculata circumdato, 

 costis radiatim cincto ; canali transversim et arcuatim striate ; 

 apertura suborbiculari ; umbilico angusto ; latitudine 2^^, longitu- 

 dine -^^ uncise. 



Although I only found a single specimen (at Sestri di Levante), 

 it is so different from any of the species hitherto described, that I 

 cannot help noticing it. Philippi has described and figured three 

 species ; but the only one this approaches in form (his S. plicata, 

 which is the S. costata of D'Orbigny) he says has no transverse 

 strise, "striis transversis nullis." It agrees with S. Bertheloti of 

 D'Orbigny (Webb and Berthelot) in the sharp keel which projects 

 considerably beyond the last whorl ; but the ribs in that species are 

 much more numerous, and it also wants the transverse striae. It 

 differs from S. striatula of Philippi in the stronger, fewer and more 

 distant ribs, both longitudinal and transverse, as well as in the 

 flattened spire and strong keel. This is also twice the size of either 

 of Philippi' s species. 



Haliotis lamellosa. Lam. Palmaria I. — H. tuberculataiV\\.&. B. M. 



Trochus granulatus. Ph. & B. M. — T. zizyphinus, B. M. — T. 

 conulus, Ph. ^ B. M. ; and var. /3. dilatata of Philippi, who refers it 

 to T. ziziphinus. This last resembles closely the smooth variety of 

 our species ; and the difference of colour (on which the authors of 

 the ' British Mollusca ' lay stress), as well as the smaller size of the 

 Mediterranean specimens, scarcely, I think, warrant a specific distinc- 

 tion ; var. (T. violaceus, Risso). — T. dubius. Ph. (T. conulus, 

 var. ?). — T. exiguus, B. M, (T. crenulatus, Ph.)\ and var. T. striatus. 

 Ph. ^ B. M.—T. fragarioides, Ph.—T. articulatus. Ph. {T.fraga- 

 rioides, var.1). — T. Laugieri, Ph. — T. divaricatus. Ph. ; var. Isevis ; 

 and var. minor. — T. sanguineus, Ph. — T. Adansonii, Ph. — T. magus. 

 Ph. ^ B. M.—T. canaliculatusy Ph. Nice— T. varius, Ph.—T, 

 Richardi, Ph. — T. umbilicaris. Ph. — T. leucophaeus, Ph. ; var. ; and 

 monstr. — T. tumidus, B. M. (T. Racketti, Ph.). 



