70 CLASSIFICATION. 



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

 Olividfe. Of course Ranellidai and Tritonidse do not appear at all 

 in this table of Rhachiglossates — their dentition places them in 

 the Tit'niosjlossates. 



GASTEROPODA. 



Sub-class DKECA. 

 Order III. Pectinibranchiata. 

 (Sub order TOXOGLOSSA. ) 

 Sub-order RHACHIGLOSSA. 



{Typica.) Formula O-l-O- (PI. 5, fig. 48). 

 Family 50. Cystiscid^ = Cystiscidge, Stm. 



Family 51. Marginellid^ < ' Marginellacea, Troschel. 

 Family 52. Volutid^ = Volutacea, Tr. 



-r^ , . ... ( Volutoniitrina, Gray. 



a. lolutomttmm { ^moriana, Gray. 



b. Volutin. {^i^l^- 



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

 Family 53- FASCiOLARiiDiE = Fasciolariacea, Troschel. 



a. Fusince. 



b. Fasciolariince. 



Family 54. Mitrid^ = Mitracea, Tr. 



( Duplohamata. ) 

 Family 55. Melongenid^: = Cassidulina. Tr. 



Family 56. Btjccinid^ < Fusacea, Tr. 



a. Photinw = Pbotina, Tr. 



b. Buccininoi = Buccinina, Tr. 



c. Ghrysodomince = Neptuniua, Tr. 

 Family 57. Nassid^ = Nassacea, Tr. 



a. Cyclonassince, 



b. Nassininm. 



Family 58. Cynodontid^ < Fusacea, Tr. 



a. Gynodontinw = Vasina, Tr. 



b. Imbricariince = Imbricariina, Tr. 



? Family 59. Turbinellid^ < Vasidae, H. & A. Ad. 



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

 Family 60. Turrid^ = Strigatellacea, Tr. 



Family 61. Olivid^ = Olivacea, Tr. 



a. OUvincB = Dactylina, Tr. 



b. OUvelUnw = Olivellina, Tr. 



c. AncillincB = Ancillina, Tr. 



