CLASSIFICATION. fl 



Family 62. HARPIDJE = Harpacea, Tr. 



Family 63. PTYCHATRACTID^E = Ptychatractidae, Stm. 

 Family 64. MURICIDJE. 



a. MuricincB = Muricea, Tr. 



b. Purpurince = Purpuracea, Tr. 



(Atypoglossa.} (PI. 5, fig. 50.) 

 Family 65. COLUMBELLID.E = Columbellacea, Tr. 



The relations of the typical Fusi with Fasciolaria are intimate 

 and a species of the former examined by Stimpson* has the saw- 

 like lateral teeth of the latter ; on the other hand, Macdonaldf 

 found the dentition of another species of the typical Fusi to 

 agree with that of Murex in having simple, uncinate pleural teeth. 



I propose to follow a classification which does not differ very 

 essentially from that most approved before the advent of the 

 lingual system, but modified nevertheless by certain ameliorations 

 which the latter has enabled us to perceive for the first time. It 

 is not denied that this arrangement is exceedingly artificial all 

 are so ; but it it believed to be the most obvious, therefore, the 

 easiest. It may be remarked here, that one of the inherent diffi- 

 culties of arrangement in a lineal line is caused by inter- 

 relationships ; thus, I have chosen to proceed from Murex to 

 I'urpura, then to Triton, to Fusus and to Buccinum ; yet the 

 three latter groups are equally related to Murex and with one 

 another, and the passage from one group to another is so gradual 

 that the assignment of some of the out-lying forms to a genus is 

 very difficult. 



Classification adopted in this Work". 



FAMILIES. 



1. MuRiciD.'E. Including Muriciniii and Purpurimt. 

 *2. TRITONIDJS. Tritoniuse, Ranelluue. 



FUSID^E. Fusinae (typical) Fasciolariimw, Ptychatractina. 1 . 

 BUCCINID^E. Xeptuninae, Melongenina?, Buccininae, Pisa- 

 uiinae, Photimt. 



5. NASSID^E. Nassinse, Cyclonassinte. 



(6. Turbinellidffi. 1. Volutida?. 8. Mitridte. 9. Colum- 

 bellidte. 10. Marginellidae. 11. Olividse, including Ancillaricinse. 

 12. Harpidae, etc.) 



*Am. Jour. Conch, i. 54. 



fAnn. Mag. Nat. Hist., 4 ser., ii. 243. 



