OF MOLLUSCA. 53 



1. SCALARIA. 



Shell turrited ; spire with regular varices ; aperture roundish ; 

 lip reflexed, forming varices. 



1. S. clathrus, t. 127. 



2. S. pseudoscalaris, t. 127. f. 8. 



3. S. Trevelyana, Forbes fy Hanley, B. M. t. F.F. f. 1, 2, 3, figured 



as if it had a tapering rostrum ! and distant lateral tentacles. 

 —Adams, Gen. Moll. t. 23. f. 8. 



Cirsotrema, Morch, has distant rounded varices, with thin inter- 

 mediate concentric lamellae. 



C.varicosa, Adams, Gen. Moll. t. 23. f. 9. 



Fig. 31. — Scalaria Turtoni. 



The foot of Scalaria Grwnlandica is short, thick, nearly quadran- 

 gular. Head elongated, rounded superiorly, not separated from the 

 neck by any distinct line. Tentacles two. Eyes small, at the outer 

 base of the tentacles. Mouth rather large, rounded, corrugated. 

 Operculum horny, strong, opake, of few whorls. It is sluggish in 

 its movements, and feeds eagerly upon fresh beef, especially if some- 

 what macerated. 



The teeth of Scalaria Trevelyana are numerous, in an angular 

 cross line, and the prehensile collar is very distinct. — Alder. 



The head of Scalaria pseudoscalaris is obtuse, rather prominent, 

 with an elongated subcylindrical proboscis. The gill is single, pec- 

 tinate. The foot oblong, truncated, and angulated in front. 



The hinder half of the sole of the foot of Scalaria clathratulus is 

 grooved longitudinally and medially by a deep central depression. — 

 Alder. The mantle forms a distinct fold opposite the lower angle of 

 the mouth of the shell. The foot is narrow, obtusely triangular, 

 and often carried considerably in advance of the head. — Forbes. 



The shells of Scalaria elegans are collected by the Spaniards at 

 St. Bias to form ear-rings ; they are called Caracoles Jinos. The 

 English species are also used as ornaments. 



Tribe II. Iniophthalma, Gray. 



Eyes sessile, on the back of the head, between, and often behind 

 the base of the tentacles. Operculum horny, spiral or annular 

 (p. 10). 



In the young shell the first whorl is placed across the others, 

 and this character is often to be observed on the apex of the adult 

 shell. 



