TRANSACTIONS OF WAGNER 



I22O 



TERTIARY FAUNA OF FLORIDA 



script of Hvass for Humphrey, the London auctioneer, the name Pectunculus 

 is retained for the Linnean Venus. A genus Cuneus, for bivalves with the 

 beaks near one end, was proposed in the " Elements" with a fossil Trigonia as 

 example ; in the " British Conchology" Donax, Saxicava, Rupellaria, etc., are 

 included ; in the " Museum Calonnianum" all the identifiable species belong to 

 Donax, and it may be regarded as a synonym of Donax L. 



Bruguiere practically made no change, for though he instituted the genus 

 Lucina for some of the Tellinas of Linne, the species of Codakia, which the 

 latter had included in Venus, still remained there on the plates of the " En- 

 cyclopedic Methodique" in 1797. 



The first person to break up the Linnean genus was Bolten, whose posthu- 

 mously printed catalogue of 1798 contains a host of new generic names. A 

 study of Bolten's lists shows that it was still the external ornamentation and 

 general form, rather than such characters as the hinge, pallial sinus, or mus- 

 cular impressions, upon which he relied to discriminate his groups, but he had 

 a keen eye and instinctively brought together species which on the whole were, 

 by modern standards, to be regarded as akin. His groups may be described as 

 follows : 



Paphia Bolten. 



Shells compressed, elongate-ovate, smooth or feebly concentrically sculp- 

 tured. The group contains Venus gigantea Gmelin (a Macrocallista), V. meroe 

 Gmelin (a Sunetta), and four species of Tapes. 



Gafrarium Bolten. 



Oblong shells with strong reticulated sculpture. It contains Venus fimbriata 

 Gmelin (a Corbis), V. pectinata Gmelin (= Crista Roemer), and Venus reticu- 

 lata Gmelin (a Cytherea). 



Cytherea Bolten. 



Orbicular species, which he divides into two groups: i, flattened forms, 

 containing Venus granulata Gmelin (Timoclea), V. tigrina (a Codakia), V. 

 concentrica Born (a Dosinia), Venus scripta Gmelin (a Circe), V. rugifera 

 Lam. (Circe), Venus histrio, V. exoleta, and V. sinuata Gmelin (Dosinia) ; 

 2, convex species, containing Venus puerpera, rugosa, and verrucosa Gmelin, 

 and V. juvenilis Lam. (a Dosinia). 



Venus Bolten. 



Subtriangular species, which are divided into two groups: I, subovate ; 2, 

 triangular, these last being also separated into smooth and sulcate subgroups. 



