no PHYLOGENY OF FUSUS AND ITS ALLIES. 



become more elongate and narrower, the outer lip being nearly straight 

 instead of uniformly curved as in typical individuals of C. conjunctus. 



In the character of the whorl and the outline of the outer lip, as 

 well as the profundity of the posterior canal, this shell approaches the 

 young of C. parisiensis, but that species has a sutural shoulder or ter- 

 race, and not a canal, as irt the present individual. The features are 

 sufficient for specific distinction, but since only one specimen is known 

 it is better to consider it a gerontic or highly accelerated individual. 



Horizon and Locality: Paris Basin, Calc. gross. (Grobkalk.) Coll. 

 Bronn. (M. C. Z. 1105). 



CLAVILITHES PARISIENSIS (Mayer-Eymar). 



(Plate X, fig. 10; Plate XI, figs. 7-9.) 

 1803. Fiisus longccvus Lamarck, Ann. du Mus., t. I, p. 317. 

 1816. Fusus longccvus var. Lamarck, Encycl. Meth., pi. 425, fig. 4; also F. cla- 



vellarns var., ibid., fig. 2 a-b. 

 1837. Fusus longccvus Deshaves, Coq. Foss. Env. Paris, t. 2, p. 525, pi. 74, 



figs. 18, 19. 

 1840. Clavilithes longcEVus Swainson, Treatise on Malacology, p. 304, fig. y2 b. 

 1866. Fusus longccznis Deshayes, Anim. sans vert., t. Ill, p. 256. 

 1877. Fusus (Cyrtulus) parisiensis Mayer-Eymar, Pal. Pariserstufe von Ein- 



siedeln, p. 89. 

 1889. Clavilithes deformis Cossmann, Cat. Coq. Foss. Eoc. Env. Paris, p. 173. 

 Not Murex longccvus Solander, Brander's Foss. Hants., 1766, p. 22, pi. II, fig. 40, 



pi. VI, fig. 73- 

 Not Murex deformis Solander, ibid., p. 22, pi. II, figs. 37-38, pi. VIII, fig. 83. 



It is very unfortunate that the well-known type species of the genus 

 Clavilithes, the Fiisus longcevus of Lamarck, should have to suffer 

 transference from one specific name to another. Since the specific 

 name was preoccupied by Solander in 1766 for a totally distinct species 

 of the British Eocene it can not be retained for the Paris Basin species, 

 the type of the genus. M. Cossmann, the eminent French authority 

 on the fossils of the Paris Basin, has recognized this point, and sought 

 to rectify it by applying Solander's name F. deformis to the type 

 species, holding that the French species is identical with the British one 

 to which Solander applied that name. I feel convinced that that is a 

 mistake. The types of Solander's Murex deformis were very young 

 specimens, the one in the early nepionic, the other in the early neanic 

 vStage. The protoconch in both cases is heavy and irregular, of the 

 type shown in the specimen pi. XIV, fig. 5. The early whorls are also 

 depressed or flattened in the upper exposed portion, thus producing 

 a trochoid rather than a naticoid apex. 



It seems to me highly probable that the specimens figured by 

 Solander are the young of the large species so characteristic of the 

 British Eocene, which is herein described under the name Clavilithes 

 solandcri, new species, and which Solander figured as a variety of his 



