3G8 Mr. E. A. Sinith on the Genera 



1878. Mesalia breviaUs : Kobelt, Illust. Concliyl. p. 138, pi. xlix. fi^. 3. 

 1887. Mesalia brcviulis : Tryou, Mau. Ooncli. vol. viii. p. 209, pi. Ixv. 



fi^s. 28-29. 

 1897. Mesalia brevialis: Kobelt, Conch. Cab., TiirriteJla, p. 71, pi. xxi. 



Iig3. 1-3. 



Uab. Goree, Senegal, Sierra Leone. 



Var. varia. 



1843. Titrritella varia, Kiener, Coq. Viv. p. 42, pi. ii. figs. 3, 3 a, 3 b. 

 1849. Mesalia brevialis (partim) : Reeve, Conch. Icon. vol. v. fig. 2 a, 

 1887. Mesalia brevialis (partim) : Tryon, Man. Conch, vol. viii. pi. Ixv. 



fig. 27 (after Reeve), fig. 30 (after Kiener). 

 1897. Mesalia varia : Kobelt, Conch. Cab., Turritella, p. 72, pi. xxi. 



tigs. 8-11. 

 1902. Mesalia varia, var. imbricata, Pallary, .Touru. de Conch, vol. 1. 



p. 16. 



Bab. Mogador, Tangier, Algeciras. 



Var. freytagi, 



1884. 3Iesalia freytacji, Maltzan, Naehrichtsblatt deutsch. malak, 

 Gesell. 1884, p. 68. 



Hob. Goree, Senegambia. 



Wiiether M. brevialis should be divided in two or more 

 species seems somewhat doubtful, but, from the material 

 examined, I have been unable to tiiid a parting-line of sepa- 

 ration between the typical very large form, which seems to 

 be restricted to the Senegambia region, and the smaller var. 

 varia, found at Mogador, Tangier, and South S[)ain *. Tiie 

 difference in size is enormous, but the sculpture, although 

 vaiiable in strength, is of the same character and the oral 

 features are similar. 



Tiie typical form is well figured by Kiener (pi, xii. fig. 1), 

 and the Ujiper portion of his figure answers exactly to La- 

 marck's description ''anfractibus convexis, Isevibus, prope 

 marginem superiorem uui^ulcatis " and *' elle est fort rac- 

 courcie, relativement ^ sa grosseur. Longueur, 2 pouces.'^ 



Another large form is that figured by Reeve [Turritella, 

 pi. v. fig. 16 b). It is narrower and distinguished by finer 

 spirals than the type. The variety varia is also finely 

 ridged, but smaller ; however, intermediates in size occur. 

 M. freytagi has very convex whorls, most of which are 

 bicariiiate and display more colour-markings. 



Turritella caribcea, d'Orbigny, said to be from Cuba, was 



* Hidalgo has expressed a similar opinion (Journ. de Conch, 1867, 

 vol. XV. p. 394). 



