41 



Ancylus aduncus. Testa exigua, oblique conica, viridula, 

 striis radiantibus et striis concentricis decussata ; apice acuta, 

 valde incurvata : apertura ovato-rotundata. Long. \, lat. -fa, 

 alt. y^ poll. Hab. Mountain streams, Madeira. 



Closely resembles A. jiuviatilis, and probably still more 

 A. radiatus, Guilding. 



Dombeya fasciata. Testa ovata, tenuis, ferrugineo-vire.ns, 

 fusco spiraliter fasciata, creberrime plicato-striata et lineis vol- 

 ventibus minimis decussata; spira acuta; anfr. 6 ventricosis ; 

 sutura pallida, marginata : apertura semilunaris ; columella alba, 

 plica acuta instructa. Long, f, lat. § poll. Hab. River Concon, 

 Chili. 



Allied to Chilina fluctuosa, D'Orb., but is more regular in form, 

 more ventricose and more solid ; and is noted for its very minute 

 revolving lines, its bands, and its pale suture. 



Dombeya obovata. Testa obovata, solidula, pallide olivacea, 

 longitudinaliter colore saturation fulguratim virgata : spira curta, 

 anfr. 6, convexis, ultimo magno, antrorsum attenuato, postice 

 sub-angulato : apertura magna, elongato-ovata ; columella alba, 

 sub-recta, bene plicata : interior livescens. Long. ■§•, lat. £ poll. 

 Hab. Concon River, Chili. 



In size and marking it is similar to C. major, Gray, but is less 

 broad, and the suture much less impressed. It is much larger 

 and more ventricose posteriorly than C. pulchra, D'Orb., and 

 much less pictured. 



Limnea volutata. Testa parva, tenuissime striata, fulva,cy- 

 lindraceo-ovata : spira decollata ; anfr. 2-3 superstitibus obliquis, 

 convexiusculis ; sutura modica : apertura ovata, dimidiam testae 

 superans ; columella rufa, valde sinuata. Long. t 3 q, lat. £- poll. 

 Hab. Oahu. 



Much smaller than L. Oahuensis, Souleyet, and with less tumid 

 whorls, sloping gently to the suture. The somewhat cylindrical 

 aspect of the shell is peculiar. 



Limnea lepida. Testa gracilis, elongata-conica, fragilis, di- 

 lute cornea, striis volventibus remotis et striis incrementalibus 

 undulosis decussata : spira acuminata ; anfr. 5 obliquis, convexi- 

 usculis : apertura magna, semilunaris, expansa ; plica columellari 

 6 



