KS90.] MARINE MOLLUSCA OF ST. HELENA. 2/3 



SCALARIA CONFUSA. 



Scalaria turricula, Sowerby, partim, Thes. Conch, vol. i. p. 92. 



Hab. Catanuan, Isle of Luzon, Philippines (C?<»jm^) ; Sandwich 

 Islands {Mus. Cuming); N.W. Austraha {Capt. Bechett in Brit. 

 Mus.). 



Sowerby seems to me to have included two species under the 

 name S. turricula — the one a distinctly striated shell with unequal 

 varices ; the other, which I now name S. confusa, being smooth and 

 with more regular riblets. The true turricula is represented by 

 figure 88 ' in the ' Thesaurus,' where the thick varix on the 

 penultimate whorl shows the spine or tooth-like projection at the 

 upper end, a feature not occurring in Sc. confusa. It is only the 

 thick riblets (former peristomes) which have the spine. ' The- 

 saurus,' fig. 61, fairly represents the form of the present species, but 

 the colour is too red, the varices not fine enough, and the interstices 

 should be smooth and not spirally striated. Fig. .59 in the ' Conch. 

 Icon.' also gives a coarse idea of this species. The St. Helena 

 specimens have the lower half of the whorls hght brown, and the 

 upper half dirty white, with obHque faint brown blotches, and all the 

 riblets are white throughout. In comparison with the three 

 specimens from N.W. Australia, those from St. Helena are a trifle 

 more suddenly tapering ; but as both exhibit the same glossy surface 

 similar colour, and varices, I feel convinced that they should be 

 considered as belonging to one and the same species. 



Scalaria fragilis, Hanley. 



Scalaria frayilis, Hanley, Conchologist's Book of Species, p. 63 

 (1842); Sowerby, Thesaurus, vol. i. p. 88, pi. xxxiii. figs. 64-66 

 (1844); id. Conch. Icon. pi. v. fig, 29. 



Scalaria albida, d'Orbigny, Sagra's Hist. Cuba, Moll. vol. ii. 

 p. 17, pi. X. figs. 24, 2.5. 



Hah. St. Vincent's and Cuba. 



Of the five St. Helena specimens, three are rather less slender 

 than the majority of West-Indian examples, but the two others have 

 quite the same form. Species oi Scalaria appear to vary in res[)ect 

 of proportional dimensions. 



The figure in Hanley's work is not good, but I nevertheless believe 

 that it represents the same species as that described by Sowerby. 

 The latter is, however, certainly identical with <S. albida of d'Orbigny, 

 proved by a comparison of the types. 



Scalaria mellissi. (Plate XXIII. fig. 13.) 



Testa Sc. trevelyanae similis, sed paulo robustior, lamellisque 



longitudinalibus simplicihus, superne haud subspinosis. 

 Longit. 14 millim., diajn. 4^, 



The shells here desciibed were collected by Mr. Melliss, and 

 appear in his list under the name of S. modesta of 0. B. Adams. 



1 I retain this as the type because in both of his diagnoses the author refers 

 to the minute spiral striation. 



