76 PBECT SLADEN TEUST EXPEDITION. 



Table shoicing the Number of Species collected individually in each Group of 

 Islands visited by H.M.S. ' Sealark,' in 1905. 



Spp. 



A. Mauritius 2 



B. Cargados-Carajos 1 68 



C. Saya de Malha Banks 47 



D. Providence 1 22 



E. Amirantes 1 129 



F. Seychelles and Coetivy 1 179 



Aldabra I I 



Farquhar Atoll 4 



Cliagos Archipelago 182 



GASTROPODA. 



Order PROSOBRAN CHI AT A. 



Suborder i. DIOTOCARDIA. 



(a) DOCOGLOSSA. 



Family PatellidSB. 



1. Patella pica, Reeve. 



Patella pica, Reeve, Conch. Icon., Patella, fig. 45 (1854). 

 Patella chitonoides, id. ib. fig. 52. 



Loc. Seychelles : Praslin I., on reefs and rocks. 



2. Helcioniscus rota (Gmel.). 



Patella rota, Chem. Conch.-Cab. x. p. 330, tab. 168. fig. 1G19; Gmelin, Syst. Nat. vol. vi. 

 Patella scalata, Reeve, Conch. Icon., Patella, fig. 89. 

 Patella variegata, Reeve, Conch. Syst. tab. 136. fig. 1. 

 Patella petalata. Reeve, Couch. Icon. fig. 56. 



Loc. Seychelles : Praslin I., with the preceding species. 

 Coetivy I. 



(6) RHIPIDOGLOSSA. 



Sect. i. Zygobranchiata. 



Pamily Fissurellidae. 



3. Olyphis riippellii (Sowb.). 



Flssurella riippellii, Sowb. Conch. Illustr. fig. 75; Reeve, Conch. Icon. vi. Fissurella, fig. 54. 

 IjOC. Amirantes : St. Joseph I. 



Beach-worn specimens only, probably to be referred to this species, a not uncommon 

 Mauritian mollusc. 



