482 Mr. A. Adams on the Scalidre of the Sea of Japan. 



distantibus, interstitiis spiraliter transversim liratis ; apertura cir- 

 culari. 



This charming Liliputian species most nearly resembles in 

 form Scala scalaris, Linn. ; but the varices are thin, and the 

 interstices conspicuously lirate. 



Subgenus Clathrus, Oken. 



18. Scala hexagona, Sow. Mon. Scalaria, fig. 67. 



Hah. Awa-Sima; in shell-sand. 



If I am right in the identification of the species, it is also 

 found, according to Mr. Sowerby, at Acapulco. 



19. Scala elenensis, Sow. Mon. Scalaria, fig. 102. 



Hah. Mino-Sima; 63 fathoms. 



Found, if I am right in my determination of the species, also 

 in West Columbia. 



2. Genus Am^ea, H. & A. Adams. 



Shell thin, turreted ; whorls cancellated. Aperture irregular ; 

 peritreme simple, acute. 



1. Amaa magnifca, Sow. 

 Scalaria maynifica, Sow. Mon. Scalaria, fig. 103. 

 Hah. Mino-Sima ; 63 fathoms. 

 Also from China, Yellow Sea, &c. 



2. Amaa decussata, Lamk., Sow. Mon. Scalaria, fig. 140. 

 Scalaria cancellata, Ruraph. 

 Hah. Mino-Sima ; 63 fathoms. 

 " Coast of Arabia," Mr. Sowerby. 



3. Genus Cirsotrema, Morch. 



Shell solid, imperforate ; whorls striated or cancellated, often 

 with irregular varices. Aperture circular; peritreme with a 

 marginal varix. 



1. Cirsotrema sulcatum, Sow. Mon. Scalaria, fig. 111. 

 Hah. Mino-Sima ; 63 fathoms. 



Brought also from the Philippines by Mr. Cuming. 



2. Cirsotrema hicarinatum, Sow. Mon. Scalaria, figs. 113, 114. 

 Hah. Mino-Sima; 63 fathoms. 



Brought also by Mr. Cuming from the Philippines. 



