MoUusca from the Xorth-ivest Falklands. 117 



Viir. latecostata, Stieb. 



Scalaria magellanica, \a,v. latecostata, 11. Strebel, Mollusk. der Magal- 

 Laeii-Provinz, Zool. Jahrb. Baud xxii. Ileft 6, Jeaa, VdOo, p. t)58, 

 Taf. xxiii. tig. 43 a-d. 



Rapid Point ; at low-water mark. 



This is a very elegant form, and presents a very difFereat 

 appearance from the type, the ribs being, as thespecitic name 

 implies, broader by tar and fewer in number tlian those ot" 

 iiKujellanica. It seems to us that, unless intermediates be 

 found, it might be considered a true species. 



Section (6) T^nioglossa. 

 Fam. Naticidae. 



Natica impervia, Phil. 

 Natica impervia, Philippi, Archiv fiir Naturg. i. p. 65 (1845). 



Fine examples, alive, with the smooth calcareous operculum 

 attached. Tiiey have not been exactly localized, but doubt- 

 less occur plentifully in the sandy coves. 



Lamellaria amplcij Streb. 



Lamellaria ampla, II. Strebel, Mollusk. der Magalhaen-Provinz, Zool. 

 Jahrb. Band xxiv. Jena, 1906, p. 135, Taf. xi. tig. 70 a-c, 



A single example, pure white, very fragile, and slightly 

 broken, but characteristic. 



Fam. Calyptraeidse. 



Crepidula dilatata, Lamk. 



Crepidula dilatata, Lamarck, Auini. sans Vert. vii. p. 644 ; Sowerby, 

 Thes. Conch, v. p. 65, tigs. 100, 101 ; Keeve, Couch. Icon. xi. p. 3. 



Eapid Point (March 31, 11)11). 



Trochita radians (Lamk.). 



Trochus radians, Lamarck, Anim. sans Vert. vii. p. 11. 

 C'ulijptncii radians, Deshayes, Eiic. Moth. ))1. cxv. tig. 3. 

 Culyptrcea {InfundibiUum) radians (Laniarckj, Tryon, Man. Condi, 

 viii. p. 121, pi. XXXV. figs. 84-88 (1886). 



Shallow Bay, at low water. 



The synonymy of this species is very extensive, and is 

 given to some extent in Tryon's ' Manual.' Of the various 

 names employed, rorrugatd, Reeve, is [)rob;ibly the most 

 familiar next to that actually adopted. 



