54 SO AL ART A. 



Scalaria has been monographed by : 



Kiener, Iconog. Coq. vivantes. 20 species. (No date.) 



Sowerby, Thesaurus Conchyliorum, i. 93 species. 1847. 



Sowerby, in Reeve's Conch. Icon., xix. 125 species. 1874. 



Besides these, Morch has published in the Journal of the Phila- 

 delphia Academy ,viii, 1876, an impoitant paper on theWest Indian 

 species, based principally on the study of the specimens belonging 

 to the Robert Swift collection, in the museum of that institution. 



An alphabetical catalogue of the recent and fossil species of 

 Scalaria, published by H. P. Nyst in the Annales de la Soc. 

 Malacol. de Belg., vi, 1873, includes 162 living, 161 tertiary, 51 

 cretaceous and 4 Jurassic species. 



Genus SCALARIA, Lam., 1801. 

 Section SCALARIA (sensu stricto). 

 S. PRETIOSA, Lam. PL 11, fig. 31. 



Widely umbilicated, smooth, polished, usually fleshy white, 

 the ribs ivory-white ; whorls 8, rounded. Length, 2-5 inches. 



China , Australia, Moluccas. 



This is the well-known " precious wentletrap," the Turbo 

 scalaris, of Linnaeus. 



S. CRENULATA, PeaSC. PI. 11, fig. 32. 



Umbilicated, smooth, white; whorls 4, separated by a deep, 

 wide suture ; lamellae 6, crenulated on the edge. Length, 5 mill. 



Tahiti. 



At first sight appears like a diminutive S. pretiosa, but is 

 wider, with less numerous, crenulated varices. 



S. PALLASI, Kiener. PI. 11, fig. 33. 



Shell narrower than S. pretiosa, with narrower umbilicus, fleshy 

 white between the ribs ; whorls 8, somewhat disunited, lamellae 

 more numerous than in S. pretiosa, usually slightly hooked at 

 the top of the whorls. Length, 1-5 inches. 



China, Philippines, Mauritius. 



The synonyms are S. neglecta, Reeve (not Adams and Reeve); 

 S. subpretiosa, Blainv. ; S. notha, Menke, and S. Nicobarica, 

 Beck, MS. 



