124 J. Star Me Gardner — On the Gault Aporrha'idce. 



IV. — On the Gault Aporrbaidx:. 

 By J". Starkie Gardner, F.G. S„ 

 (PLATE V.) 



{Continued from page 56.) 



Addenda and Notes to Group 1. 



Since the appearance of the first part of this paper, I have had, 

 through the kindness of M. Deshayes and Prof. Gaudry, an 

 opportunity of examining the original specimens in D'Orbigny's 

 cabinet in the Jardin des Plantes, and am enabled to add the fol- 

 lowing to the list of species included in Group 1. They are all in 

 the Prodrome : — 



A. Aonis, D'Orb., from the Chalk. 



A. Mailleana, D'Orb., id. 



A shell of larger size than A. retusa or A. Fittoni, with very 

 angulated whorls, one strongly developed keel visible to the apex of 

 the spire, a second keel visible on the last whorl only : — wing 

 unknown. 



The figure in the Pal. Fr. does not resemble in its characters the 

 specimen in the cabinet numbered 6238, which is identical with one 

 of the two Grey Chalk species mentioned last month as undescribed. 

 If the figure is correctly drawn, there are two species under this 

 name : — 



A. (Pt.) marginata, D'Orb. 



Some of the specimens are probably A retusa, but others are more 

 globular, and are regularly and deeply striated, resembling the 

 second undescribed form mentioned from the Grey Chalk. Any 

 definite opinion as to their identity must be reserved until better 

 specimens are procured. 



The figure in D'Orb. Pal. Fr., pi. 217, fig. 2, is much larger than 

 any in the cabinet, which do not exceed the dimensions of the test 

 of A. retusa. 



A. Moutoniana, D'Orb., and A. provincialis, D'Orb., from the 

 Neocomien of Escragnolles and Var, are probably the A. Fittoni of 

 the Lower Greensand. 



A. (Pt.) Bochatiana, D'Orb., has the form of A. Fittoni, but with 

 unkeeled, inflated upper whorls, and tuberculated keels on the lower 

 whorls. Neocomien. 



A. angidosa, D'Orb., from Sta.-Fe de Bogota, is a small distinct 

 species, with angular and pronounced keels. Neocomien. 



A. Americana, D'Orb., id., Colombia, St. Martin (Var), and 

 Chateau-neuf (Hautes Alpes), has a slightly longer spire, angular 

 whorls, keels as in A. Mailleana, and short expanded wing, linking 

 the present group with Groups 3 and 4. 



Fusus Cottaldinus, D'Orb., Ste.-Croix, is the young of A. retusa. 



There is also a very distinct form in the splendid museum of the 

 Ecole des Mines in Paris, which has a globular shape, with depressed 

 spire ; all but the last whorls strongly striated and reticulated. 

 The Strombus pyriformis, Kner, figured by Geinitz in the Quader- 

 sandsteingebirge, is probably intended to represent this species, as it 

 is from the same locality — Lemberg. 



