586 PAXILLUS. — CLAUSILIA. 



Genus pro specie unica, haud facili alii generi inserenda, cou- 

 stitutum, a CL Auctoribus cum dubio Auriculidis adscriptum, 

 Heliceis ex testae characteribus magis congruum, quamobrem, 

 deficiente animalis cognitione , pro tempore iocum in vicinia 

 Clausiliae ei assignavi. 



1. P. adversus H. et A. Adams. 



T. sinistrorsa, breviter rimata, ovato-conica, tenuis, sub- 

 tilissime striatula, cereo-hyalina; spira ventrosa, sursum conica, 

 acuta; anfr. 8 planiusculi, ultimus angustior, antice arcuatim 

 ascendens; columella basi transverse lamellata; apertura pai-um 

 obliqua, semiovalis; perist. expansum, margine utroque ad an- 

 fractum penultimum ascendente, columellari reflexo. — Long. 

 6, diam. 3 mill. Apert. c. perist. SV^ mill. longa. (Coll. Nr. i.) 

 Paxillus adversilS H. et ^4. Adams in Ann. and Mag. 2 d. ser. 



Vn. p. 63. 

 Habitat prope Singapore (Adams); in insula parva prope Ma- 

 lacca (Mus. Cuming.j. 



Obs. Nuni ad hocce genus forsan pertineat Balea peregrina Guuld? 



XXIII. Clausilia Draparnaud. 



Genus characteribus fixis, in Monographia 1. p. XXV et 

 in Albers Helic. p. 213 expositis, circumscriptum, numero 

 specierum notarum mirum in modum continue increscens. Quae 

 mihi innotuerunt, methodo antea adhibita simili in sectiones 

 sequentes distribuam, 



Conspectus specierum. 



l. Anfraclu ultimo longe soluto, descendente, aper- 



tura subcirculari §. l.Nr. 1—3, 



II. Anfractu ultinio vix solulo vel appresso. 

 A. Lunella nulla. 



a. Apertura basi rotundata. 



a. Dextrorsae §.2. — 4. 



^. sinistrorsae 



* sublaevigatae §.3. — 5 — 33. 



** costulatae §.4.-34 — 47. 



lumella with a single prominent tooth-lil<e plait ; ouler lip with a double 

 pei-itreme, emarginale anletiorly ; nn)bilical region wilh a spiral elevated 

 ridge, (ernsinating in a notch at the tore part of the aperlure. (H. et A. 

 Adams I. c.) 



