536 Rev. L. Guilding on the Zoology of 



2. Ancylus radiatus. 



A. flavescensj nigro irroratus, dorso maculis tribus vel quatuor 

 pallidis magnis : facie rufescente : abdomine obscuro. 



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

 radiatim striata, epidermide evanescente. 



Habitat cum praecedente ; pulchra species. 



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

 pat. testae. — 9. Testa aucta. 



Familia. AMPULLARiADiE. Guild. 



Synopsis Generum, 



Genus 1. Paludina. Auctorum. 



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

 nato, saepiiis canaliculato ; operculo testaceo. 



rA» globosa. -s 



* Umbilico parvo; testa globosa. 2 A. corrugata. > Swains, 



i, A. puncticulata. 5 



** Umbilico evanescente A. crassa Swains. 



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



operculo corneo. 



■ A.fasciata. 

 A. sordida* 



* Testa globosS, ; umbilico majori*^ Jf. luteostoma. SSwai 



A, reflexa, 

 A. leucostoma. 



** Test^ oblong^; umbilico minori. A, oblonga Swains. 



*** Testa globosa ; apertura angus- 

 tk ; umbilico maximo, pro- 

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



* Nomen a *nai.^vs crassus, et srof^Xj os. 



+ This species forms the transition through Ceratodes to the Planorbida, and 

 is probably more allied to that genus than to Ampullaria. 



