Umboniidse from the Seas of Japan. 267 



stome is produced into an angle, which ascends on the last 

 whorl. 



Genus Teinostoma, A. Adams. 

 1. Teinostoma concentricum, A. Adams. 



T. testa orbiculato-ovata, superne convexa, alba, solida, semiopaca, 

 sulcis concentricis confertis concinne inseulpta, lineisque incrementi 

 radiantibus subtilissime decussata ; anfractibus rapide crescentibus, 

 ultimo dilatato, ascendente, alios involvente vix usque ad apicem, 

 peripheria rotundata, basi convexo ; umbilico callo convexo loevi 

 omnino obtecto ; apertura subcirculari, antice vix producta. 



Hah. O-Sima; Takano-Sima. 



A solid, convex species, with the surface finely concentrically 

 grooved — a peculiarity which distinguishes it from any of the 

 species already known. 



2. Teinostoma radiatum, A. Adams. 



T. testa orbiculata, depressa, superne convexiuscula, basi subplana, 

 semiopaca, alba, liueis incrementi radiantibus conspicue ornata ; 

 umbilico callo excavato angulato obtecto ; anfractibus subito 

 crescentibus, ultimo alios involvente usque ad apicem ; apertura 

 depressa, antice producta. 



Hah. O-Sima. 



This species is distinguished by its depressed form and the 

 conspicuous radiating lines which proceed from the axis towards 

 the periphery. The callus covering the umbilicus presents a 

 sharp angular excavated edge near the inner lip. 



3. Teinostoma lucidum, A. Adams. 



T. testa oblique ovata, depressa, superne convexa, inferne planiuscula, 

 alba, laevi, pellucida, striolis incrementi obsolete radiata ; umbi- 

 lico callo piano subcirculari opaco obtecto; anfractibus rapide 

 crescentibus, ultimo ascendente, alios involvente usque ad apicem ; 

 apertura subborizontali, depressa, antice producta. 



Hob. Simoda. 



This species differs from the others already described in being 

 smooth and pellucid; the last whorl is also considerably more 

 dilated anteriorly. 



Genus Calceolina, A. Adams. 



Testa neritiniformis, oblonga, depressa ; spira parva ; anfractibus 

 rapide accrescentibus ; regione umbilicali callosa. Apertura semi- 

 circularis, intus non margaritacea ; labio callo magno-lato obtecto, 

 postice umbilicum tegente ; margine antico recto, simplici. 



This little genus is established on a shell I found at Tanabe, 

 and which I believe to be the same as the Neritina pusilla of 



18* 



