70 CLASSIFICATION. 



between them, as for instance, to take an extreme case, the 

 Olividae. Of course Ranellidae and Tritonidae do not appear at all 

 in this table of Rhachiglossates their dentition places them in 

 the Taenioglossates. 



GASTEROPODA. 



Sub-class DICKGA. 

 Order III. PECTINIBRANCHIATA. 

 (Sub order TOXOGLOSSA. } 

 Sub-order RHACHIGLOSSA. 



(Typica.} Formula (H'O- (PI. 5, tig. 48). 

 Family 50. CYSTISCIDJE = Cystiscidae, Stm. 



Family 51. MARGINELLID^E < Marginellacea, Troschel. 

 Family 52. VOLUTION = Volutacea, Tr. 



a. Volutomitrince { yolutpmitrina, Gray. 



I Amoriana, Gray. 



b. Volutina> fVolutina Gray. 



( i etina, Gray. 



(Odontoglossa.) (PI. 5, figs. 49, 51), 

 Family 53- FASCIOLARIID^E = Fasciolariacea, Troschel. 



a. Fusince. 



b. Fasciolfiriinw. 



Family 54. MITRID^ = Mitracea, Tr. 



(Duplohamata. } 



Family 55. MELONGENID^G = Cassidulina. Tr. 

 Family 56. BUCCINID^E < Fusacea, Tr. 



a. Photinw = Photina, Tr. 



b. Buccinince = Buccinina, Tr. 



c. Chrysodomina = Neptunina, Tr. 

 Family 57. NASSID^E == Nassacea, Tr. 



a. Cyclonassina>, 



b. NassininoR. 



Family 58. CYNODONTID.E < Fusacea, Tr. 



a. Cynodontince = Vasina, Tr. 



b. Imbricarimce = Imbricariina, Tr. 



? Family 59. TURBINELLID.E ^ Vasidae, H. & A. Ad. 



(Hamiglowa.) (PI. 5, figs. 52, etc.) 

 Family 60. TURRID^ = Strigatellacea, Tr. 



Family 61. OLIVID^E = Olivacea, Tr. 



a. OUmnas = Dactyliiia, Tr. 



b. OlivellincB = Olivellina, Tr. 



c. Ancillince . Ancillina, Tr. 



