94 PHYLOGENY OF FUSUS AND ITS ALLIES. 



1840. Fasciolaria (Fusus) hurdigalcnsis Grateloup, Conch Foss. Tert. L'Adour, 



pi. II, fig. 6, 7, II. 

 1856. Fusus hurdigalcnsis Hornes, Foss. Moll. Tert. Beck. Wien, p. 296, pi. 32, 



figs. 13, 14 (with bibliography). 

 1901. Euthriofusus burdigalensis Cossman^ Ess. Pal. Comp. 4me liv., p. 28, pi. 



I, fig. I ; text fig. 14. 



Since De France applied only a French name to this species, merely 

 listing it withont description, he can not be considered the author of 

 the specific name, as is generally done. Basterot's description and figure 

 are the first published, and as he was the first to use the specific name 

 he must be considered its author. Basterot's figure is of a specimen 

 similar to that given in Plate V^III, fig. 6, and described below. The 

 protoconch is of the type described under the genus. 



Var. TUBERCULOSUS Grateloup (fig. 6). 

 (Plate VIII, figs. 1-3.) 



"Anfract. ad suturas tuberculiferis" (Grateloup). 



The following description applies only to the specimens figured, 

 with others from the same locality. They appear to be referable to 

 Grateloup's variety. 



The early (nepionic) whorls of the conch are round with simple 

 ribs extending from suture to suture, and crossed by spirals of moderate 

 strength. In the smaller specimen figured there are nearly three volu- 

 tions of this type. In the neanic stage the shoulder becomes flattened, 

 and the peripheral angulation appears. This stage merges into the 

 ephebic, in which the ribs become restricted to the body of the whorl, 

 the shoulder remaining ribless and slightly concave in contour. The 

 spirals have become faint on the adult portion of the shell. On the 

 periphery the ribs cause a nodulation, but this is subdued. 



Locality: Leognan, F'rance (M. C. Z. 1321). 



Ho7'izon: Miocene. 



This is the most primitive variety seen. It retains the simple 

 ribbed character through the adult. 



Var. CARINATUS var. nov. 

 (Plate VIII, figs. 4, 5.) 

 In this variety and in the succeeding ones the whorls are angular 

 almost from the beginning, though the first whorls may show a sub- 

 angular or almost rounded contour. The ribs cause a strong tubercula- 

 tion at the periphery, and this, together with the flattened shoulder 

 and the numerous spirals, gives the young shell a strong resemblance 

 to Fusus rostratus. The ribs become obsolete in the fourth or fifth 

 whorl, but the angulation continues in the form of a faint keel to the 

 end. In the more primitive types the ribs persist as nodules on the 

 keel, thus connecting this variety with the preceding one. Generally, 



