74 
Long. 6, diam. 3^ millim., apert. 3 millim. longa, vix 2 lata. 
Buccinum truncatuluvi Mulier Verm. II. p. 130. n. 325. 
Limnaeus minutus Draparnaud hist. p. 53. n. 8. t. 3. fig. 5 — 7. 
Limnaea minuta Lamarck edit. Deshayes VIII. p. 415. n. 12. 
Habitat in Madera, ad rupes aqua destillante perpetue humectatas. Frequens. 
Genus. 
A n c y 1 u s. 
Testa patelliformis, tenuis, ambitu ovato vel oblongo, epidermide induta; apice 
mucronata. 
Ancylus aduncus Gould. 
Tab. 16. Fig. 37 — 38. 
Testa ambitu ovato -oblongo, antice leniter arcuatim descendens, postice vix ex- 
cavata, tenuissima, subtiliter a vertice ad basin striata, praesertim in parte anteriore, pel- 
lucida, pallide cornea; mucro posticus, ad dextram deflexus. 
Diam. maj. 5^, min. 4, ait. 2f millim. 
Ancylus aduncus Gould. in Proceed. Boston Soc. 1847. p. 210. 
Habitat in Madera, inter confervas ad aquaeductus. Frequens. 
