264 MB. E. A. SMITH ON THE [Apr. 5, 



narrow closely costate whorls, and only two parietal lirse and the 

 same number within the outer lip. Pfeiffer states that H. helenensis 

 was described by Forbes in the Proc. Zool. Soc. for 1851, and this 

 statement is copied both by Keeve and WoUaston. This appears to 

 be an error, for after a careful search I have been unable to discover 

 in any publication the description by Forbes of any species of Helix 

 under that name. 



12. Patula minutissima, sp. nov. (Plate XXI. figs. 9-9 c.) 



Testa conoidea-depressa, mediocriter late umhilicata, alho et rufo 

 maeulata et variegata ; spira leviter elevata, superne obtusa ; 

 anfractus 7, primi duo Iceves, pallide rufescentes, cceteri 

 convexiusculi, liritlis temiihus arcuatis ohliquis, in anfr. ult. 

 flexuosis, ornati, ultimus ad feripJieriam acute rotundatus, 

 vel interdum obsolete subangidatus, antice Jiaud descendens ; 

 apertura oblique semilunaia ; lamellce parietales tenuissimce, 

 in cochleis adultis sex, in exemplis juvenilioribus quatuor vel 

 quinque ; plicce palatales S-10; peristoma tenue, marqine 

 columellari expanso. 

 Diam. maj. 4|- millim., min. 4|, alt. 2^. 

 Bab. Sugarloaf Ridge (7lK?•?o?^). Extinct. 



This species is smaller than P. polyodon, more narrowly umbili- 

 cated, has fewer whorls, coarser and more remote strise, and a 

 different armature within the aperture. In full-grown shells there 

 are as many as six parietal lirse, as it were, in two groups of three. 

 They are very fine and extend a long way within. The plicae within 

 the outer lip vary apparently from seven or eight to ten or eleven, and 

 some of them are more prominent than others. The red markings 

 take the form of radiating blotches on the upper surface, and more 

 undulating or zigzag streaks beneath. 



13. Patula leptalea, sp. nov.^ (Plate XXI. figs. 10-10 c.) 



Testa orbicularis, depressa, late umbilicata,albida rufo variegata; 

 spira vix elevata ; anfractus 5,primi 1^ laves, cceteri convex- 

 iusculi, tenuissime arcuatim striati,lente accrescentes, ultimus 

 ad peripheriam acute rotundatus, antice hand descendens ; 

 apertura oblique semi-hmata ; lamella parietales tres 

 (guarum suprema et mediana duplices sunt) tenues, longe 

 intrant es ; plica palatales circa sex. 

 Diam. maj. 3| millim., min. 3, alt. I5. 

 Hub. Siigarloaf Quarry (7^M?'^ow). Extinct, 



This species is much smaller than P. polyodon and not quite so 

 large as /-'. minulissima ; it is flatter than either, much more finely 

 stiiated than the latter, and has a different oral armature fjom both. 

 The parietal lira; are unequal in size, that nearest the collumella 

 being the smallest. The two others are about equal and double, 

 and between occasionally a very small and slender intermediate lira 

 is observable. 



^ \67rraX60Sj delicate. 



