REPORT ON THE GASTEROPODA- 303 



and narrow, running out to a sharp point, which has a fine, rounded, and slightly twisted 

 edge, but can scarcely be said to be in the least degree obliquely cut off. H. 1"4 in. B. 0-53. 

 Penultimate whorl, height 0'2. Mouth, height 0*85, breadth 0*3. 



This is a peculiarly beautiful species, singular in the breadth of its form, but very much more in 

 the extreme regularity of its biconically fusiform shape. It recalls in an extraordinary way Conus 

 dormitor, Solander, an Eocene fossil from the Barton beds of the Hampshire basin, and the cone-like 

 Pleurotomas of that formation, such as Pleurotoma prisca, Sol., Pleurotoma amp7iiconus, Sow., 

 Pleurotoma cono'idcs, Sol., and Pleurotoma biconus, Edw. Dr H. Woodward says it is near Pleuro- 

 toma ventricosa, Lam., Anim. s. vert., vol. ix. p. 372, a Grignon fossil, with which I have not had 

 an opportunity of comparing it in consequence of the transfer of the Geological collections from the 

 British Museum to Kensington. 



30. Pleurotoma [Drillia) laterculata, Sowerby (PI. XVIII. fig. 5). 



Pleurotoma laterculata, Sowerby, Proc. Zool. Soc. Lond., 1870, p. 253. 



„ {Drillia) laterculata, E. A. Smith, "Alert" Collections, p. 38, No. 5, pi. iv. fig. e. 



Station 189. September 11, 1874. Lat. 9° 36' S., long. 137° 50' E. West of Cape 

 York and south-west of Papua. 25 fathoms. Green mud. 



Habitat. — China Sea (Sowerby). 



31. Pleurotoma {Drillia) incrassata, Dujardin. 



Pleurotoma elegans (not of Defrance, 1826), Scacchi, Not. Conch, foss. Gravina, 1836, p. 43, No. 129, 



pi. i. fig. 18. 

 „ incrassata, Dujardin, M£m. Touraine, Soc. Geol. de France, vol. ii. pt. 2, 1837, p. 292, 



pi. xx. fig. 28. 

 „ maravigiue, Bivona, £1., Gen. et Spec. Nuov. posthum., 1838, p. 13. 



,, ,, Reeve, Conch. Icon., vol. i. pi. xvi. fig. 133 (see Errata), 1843. 



,, elegans, Philippi, Enum. Moll. Sicil., 1844, vol. ii. pp. 168, 175, pi. xxvi. fig. 5. 



„ incrassata, Hornaes, Moll. foss. Wien, 1853, voL i. p. 383, pi. xl. fig. 14. 



„ maravignce, "WeinkaufF, Conch. Mittelmeer., 1868, vol. ii. p. 122. 



,, incrassata, Bellardi, Moll. terz. Piemonte, 1877, vol. ii. p. 140. 



„ maravignce, Monterosato, Enumeraz., 1878, p. 45. 



„ „ WeinkaufF, Conch. Cab. (ed. Kiister), p. 96, pi. xxi. figs. 1, 3. 



„ incrassata, Seguenza, Form. terz. Calab., 1880, p. 352. 



„ maravignw, Tryon, Manual, voL vi. p. 199, pi. viii. fig. 12. 



Station 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. Fayal, Azores. 

 450 to 500 fathoms. Volcanic mud. 



Habitat. — Mediterranean (Bivona), Madeira (Watson), North- West Africa, Gibraltar, 

 Canaries, 20 to 100 fathoms (British Museum). 



Fossil. — From the Middle Miocene onwards. 



The changes made on the name of this beautiful and well-known species are very much to be 

 deplored. 



