^850 Mr. A. Adams on the Japanese Lacunidse. 



XXXIX. — On the Genera and Species of Lacunidse /oMn<7 in 

 Japan. By Arthur Adams, F.L.S. &c. 



The Lacunce have been separated by Dr. Gray from the Littorina, 

 with which they are usually associated, on account of the peculiar 

 appendiculate opercular lobe, which is expanded at the sides and 

 furnished with two beards behind. The animal, moreover, has 

 no jaws, whereas in the Littorinidse they are distinct and horny. 

 The Japanese seas furnish us with examples of all the known 

 generic and subgeneric forms, and likewise with a new and pe- 

 culiar type which I am inclined to refer to this family. 



Fam. Lacunidse. 



Genus Lacuna, Turt. 



Lacuna latifasciata, A. Adams. 



L. testa depresso-semiglobosa, tenui, late et profunde umbilicata ; 

 spiraparva, laterali; alba, fascia lata rufo-fusca ornata; anfractibus 3, 

 planiusculis, rapide crescentibus ; apertura semiorbiculari, regione 

 umbilici rufo tincta ; columella recta, angusta. 



Hab. Kino-0-Sima. 



A species of the same form as L. pallidula, Da Costa, but of 

 much smaller size, and ornamented with a broad red-brown 

 band. 



Subgenus Medoria, Leach. 

 Medoria turrit a, A. Adams. 

 Lacuna turrit a, A. Adams, Ann. & Mag. Nat. Hist. 1861. 

 Hob. Rifunsiri. 



Subgenus Epheria, Leach. 

 1. Epheria decorata, A. Adams. 

 Lacuna (Epheria) decorata, A. Adams, Ann. & Mag. Nat. Hist. 1861. 

 Hab. Rifunsiri. 



2. Epheria inflata, A. Adams. 

 Lacuna inflata, A. Adams, Ann. & Mag. Nat. Hist. 1861. 

 Hab. Rifunsiri. 



3. Epheria carinifera, A. Adams. 

 Lacuna carinifera, A. Adame, Proc. Zool. Soc. 1851, p. 225. 

 Hab. Takano-Sima. 



4. Epheria lepidula, A. Adams; 



E. testa depresso-conica, perobliqua, late umbilicata ; spira brevi, 

 acuta; alba, opaca ; anfractibus 3, convexiusculis, ultimo ad peri- 



