56 MOLLUSCA FROM THE CRAG. 



half a dozen elevated transverse lines. At the upper part, near the suture, there is a 

 row of small denticulations. The first two volutions are smooth, with a very obtuse 

 apex, in which character it disagrees with the French fossil, where it is sharp and 

 pointed. 



Clavatula,* Lam. 1801. 

 Mangelia. Leach. Risso. 1826. 

 Defrancia. 3rUler. 1826. 

 Mangilia. Lovin. 1846. 



Gen. Char. Shell fusiform, turreted, rarely of any great size, generally ribbed 

 in a longitudinal direction, and transversely striated ; aperture ovate, terminating in a 

 somewhat short, open, canal ; outer Hp sharp, sometimes denticulated within, with a 

 small sinus at the suture. 



This name was proposed by Lamarck for a division of the Pleurotomse, to contain 

 those species with a small and shallow sinus, which he afterwards, in his ' Hist, des An. 

 sans Vert.,' united to Pleurotoma. The shells here intended to be grouped together 

 are those in which the " side slit" is represented by a somewhat obscure sinus, and 

 that, instead of being in the outer lip, is situated at the upper extremity of the aperture, 

 at or near the junction of the body whoi'l. The name Mangelia was given in MS. 

 by Dr. Leach to some shells of this character in the British Museum ; and this name 

 was adopted by Risso, in his ' Hist of the Shells of Merid. Europe.' Messrs. Reeve 

 and Sowerby have recently employed it for the same shells ; Lamarck's name is, how- 

 ever, of prior date. 



Many recent species of this genus are found within the tropics, others have been 

 obtained in the Arctic seas, 



1. Clavatula linearis. Mont. Tab. VH, fig. 2, 2 a. 



MuKEX LINEARIS. Mont. Test. Brit. p. 261, t. 9, fig. 4, 1803. 



— ELEGANS. Bon. Brit. Shells, t. 179, fig. 3. 

 Fusus LINEARIS. Flem. Brit. An. p. 350, 1828. 

 Pleurotoma linearis. Thorpe. Brit. Mar. An. p. 197, 1844. 



— S. Wood. Catalogue 1842. 



Mangelia linearis. Leach. 

 Defrancia linearis. Lov6n. Ind. Moll. Scand. p. 13, 1846. 



CI. Testa turriculd, fusiformi, subventricosd, spird elevatd, acuminatd ; anfractibua 

 convexis, longitudinaliter costatis ; transversim lineatis, lineis elevatis, striatis, labro 

 incrassato, intus IcBvi ; canali brevi. 



Shell fusiform and turriculate, with an elevated and acute spire ; whorls convex, 

 longitudinally costated, and sharply striated transversely ; lip thickened on the outside, 

 smooth within ; canal short, rather broad. 



* Etym. (?) Clavatula, the diminutive of clava, a club. 



