324 PLIOCENE MOLLUSCA. 



smooth and polished whorls, a spreading inner lip and an outer lip. simple and 

 acute. JV. costulata has been taken as the type form. 



Sub-genus HIM A (Leach) H. and A. Adams, 1853. 



Nassa (Hima) incrassata (Strom). Plate XXXIV, figs. 8 — 10. 



1768. Buccinum incrassatum , Strom, Kougl. Norsk. Vid.-Selsk. Skrift., vol. iv. p. 369, pl.xvi, fig. 25. 



1846. Nassa incrassata, Forbes, Mem. G-eol. Surv., vol. i, p. 427. 



1867-69. Nassa incrassata, Jeffreys, Brit. Couch., vol. iv, p. 351, 1867; vol. v, p. 219, pi. lxxxviii, 



fig. 1, 1869. 

 1870-1911. Nassa incrassata, A. Bell, Journ. de Conch., vol. xviii, p. 346, no. 210, 1870 ; Rep. Brit. 



Assoc. (Bath), p. 135, 1888; (Leeds), p. 420, 1890; Eep. Yorks. Phil. Soc, pp. 63— 70, 1892; 



Jourii. Ipswich Field Club, vol. iii, p. 16, 1911. 

 1873-5. Nassa incrassata, Seguenza, Boll. R. Com. Geol. Ital., vol. iv, p. 300, uo. 150, 1873 ; vol. vi, 



p. 278, no. 281, 1875. 

 1874. Nassa incrassata, Darbishire, Quart. Journ. Geol. Soc, vol. xxx, p. 40. 



1881. Nassa incrassata, Nyst, Conch. Terr. tert. Belg., p. 25, pi. ii, fig. 7. 



1882. Nassa (Tritonella) incrassata, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss.. vol. i, p. 45, 

 pi. xi, tigs. 3—7. 



1882. Nassa incrassata, Bellardi, Moll. Terr. Terz. Piem., pt. iii, p. 100, pi. vi, fig. 18. 



1887. Nassa incrassata and vars., Kobelt, Icon, schalentrag. europ. Meeresconch., vol. i, p. 152, 



pi. xxvi, figs. 16—25 ; pi. xxvii, figs. 1—8. 

 1890. Nassa incrassata, Carus, Prod. Faun. Medit., vol. ii, p. 394. 



1892. Nassa incrassata, Van den Broeck, Bull. Soc. Belg. Geol., vol. vi (Memoires), p. 147. 

 1892-7. Nassa incrassata, Locard, Coq. mar. Cotes de France, p. 78, fig. 65, 1892; Exped. scient. 



Travailleur et Talisman, vol. i, [>. 276, 1897. 

 1901. Nassa (Hima) incrassata, Cossmanu, Ess. Palcoconch. compar., vol. iv, p. 210, pi. ix, figs. 6, 7. 

 1901-7. Nassa (Zeuxis) incrassata, Scuba, Atti Accad. Gioen. Sci. Nat. Catania [4], vol. xiv, p. 8, 



no. 120, 1901 ; vol. xx, p. 35, no. 313, 1907. 



1912. Nassa incrassata, Dautzenberg et Fischer, Camp. Scient. Pr. Monaco, vol. xxxvii (Mollusques), 

 p. 139. 



1913. Nassa incrassata, Gignoux, Ann. Univ. Lyon, n. s. [1], vol. xxxvi, p. 510. 



Specific Characters (of type form). — Shell thick and solid; whorls 7 — 8, convex, 

 the last tumid, excavated at the base, with a deep groove at the back of the canal 

 which gives it a pinchcd-up appearance ; spire rather short, conical, regularly 

 diminishing in size towards the apex : suture fairly deep ; ornamented by strong 

 flexuous costse, about 15 on the last whorl, crossed by well-marked spiral ridges, 

 more or less thickened or sub-granulate where they intersect ; mouth oval, acutely 

 angulated above ; outer lip much thickened by the labial rib, toothed or fluted 

 within; inner lip reflected on the pillar, also fluted internally ; canal very short. 



Dimensions. — L. 13 mm. B. 7 mm. 



Distribution, — -Recent: widely diffused, with its varieties, from Iceland and 



