536 Rev. L. Guilding on the Zoologi/ of 



2. Ancylus radiatus. 



A. flavescens, nigro irroratus, dorso maculis tribus vel quatuor 

 pallidis magnis : facie rufescente : abdomine obscuro. 



Testa ovali-elliptica, vitrea, diaphana, concentrice plicatula, 

 radiatim striata, epidermide evanescente. 



Habitat cum praecedente ; pulchra species. 



Tab. Supp. xxvi. Fig. 7. Animal serpens auctum. — 8. Long, 

 nat. testae. — 9. Testa aucta. 



Familia. Ampullariad^e. Guild. 

 Synopsis Generum. 

 Genus 1. Paludina. Auctorum. 



Genus 2. Pachystoma.* Guild. Labro crasso, margi- 

 natOj saepius canaliculate ; operculo testaceo. 

 fA. globosa. "4 



* Umbilico parvo; testa globosa. <A. corrugata. > Swains. 

 i. A. puncticulata. J 



** Umbilico evanescente A. crassa Swains. 



Genus 3. Ampullaria. Sw. Labro simplici, tenui ; 

 operculo corneo. 



A.fasciata. 

 A. sordida. 



* Testa globosa ; umbilico majori*^^. luteostoma. ^Swains. 



A. rejlexa. 



■A. leucostoma, 



** Testa oblonga; umbilico minori. A. oblonga Swains. 



*** Testa globosa ; apertura angus- 

 ta ; umbilico maximo, pro- 

 fundo ; columella obsoleta.. . A. effusa Swains. + 



* Nomen a 'nx^vs crassus, et yro/Aas, os. 



+ This species forms the transition through Ceraiodes to the Planorbid<e, and 

 if probably more allied to that genus than to Ampullaria. 



