414 Mr. A. Adams on new Mollusca from Japan. 



the columella. In size it was equal to Bithynia ventricosa. 

 Pieces of drift-wood, vegetating seeds, shells of Spirula, a small 

 Litiopa, Hyalaa, Loligopsis, and one of the venomous sea-snakes 

 of the Bay, with a keeled belly, black above and yellow below, 

 and with a broad white zigzag line running along the laterally 

 compressed tail, entered our towing nets on that night, borne 

 by the tidal currents through the group of islands. 



Morch rejects Jeffreys's Recluzia aperta from the genus, and 

 refers it to Amauropsis. The aspect of the shell is opposed to 

 the supposition of its being a floating pelagian form. 



Cheltenham, Oct. 19, 1860. 



LII. — On a new Genus and some new Species of Mollusca from 

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



Genus Cingulina, A. Adams. 



Testa subulato-turrita. Anfractus numerosi, cingulis elevatis spiralibus 

 instructi, interstitiis sculptis. Apertura oblonga, antice integra ; 

 labio recto, simplici ; labro acuto, arcuato. 



This genus most nearly resembles Monoptygma in form and 

 sculpture ; but in the straight inner lip and absence of parietal 

 fold it is like Turbonilla. The transverse ridges of the whorls 

 likewise suggest Aclis, but the form of the aperture is very dif- 

 ferent. I have found the typical species (described below) both 

 in the north of China and in the Sea of Japan. 



Cingulina circinata, A. Adams. 



C. testa subulato-turrita tenui, alba, opaca ; anfractibus normalibus 

 circa 11, planiusculis, cingulis spiralibus tribus, interstitiis longitu- 

 dinaliter concinne striatis; anfractu ultimo cingulis quatuor in- 

 structo, basi convexo, liris spiralibus elevatis ornato. 



Hab. Awa-Sima; in shell-sand. Loo-shan-Kou (Shan-tung) ; 

 in shell-sand. 



Genus Parthenia, Lowe. 



Since writing my papers containing descriptions of new spe- 

 cies of Parthenia, Odostomia, Dunkeria, &c, I have continued 

 to investigate these interesting though somewhat diminutive 

 forms, and am now enabled to record several additional species. 



1. Parthenia spirata, A. Adams. 



P. testa ovato-conica, tenui, sordide alba, rimata ; anfractibus nor- 

 malibus 4, spiratis, longitudinaliter costatis, costis rectis subdi- 

 stantibus, interstitiis Hrulis obsolete decussatis, suturis canalicu- 

 lars, costis in anfractu ultimo (basi liris convergentibus ornato) 



