NASSA (HIMA) PYGMJEA. 327 



1880. Nassa pygmsea, Stewart, Proc. Belfast Nat. Field Club, Appendix, j>. 176. 



1881. Nassa pygmxa, Nyst, Conch. Terr. tert. Belg., p. 26, pi. ii, fig. 8. 



1882. Nassa (Tritonella) pygmsea, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Eouss., vol. i, p. 47, 

 pi. xi, figs. 11 — 14. 



1887. Nassa varicosa, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. i, p. 156, pi. xxvii, figs. 9 — 14 



(N. granulata on plate) ; figs. 18, 19. 

 1890. Nassa pygmsea, Cams, Prod. Faun. Medit., vol. ii, p. 395. 

 1890. Nassa pygmsea, C. Eeicl, Plioc. Dep. Brit., p. 248. 



1901. Nassa pygmsea, Br^gger, Norges geol. Unders^gelse, no. 31, p. 662, pi. xvi, fig. 24. 

 1901-7. Nassa (Zeuxis) varicosa, Scalia, Atti Accad. Grioen. Sci. Nat. Catania [4] vol. xiv, p. 8, no. 122, 



1901 ; vol. xx, p. 35, no. 315, 1907. 



Specific Characters. — Shell smaller and more delicate than N. incrassata, with 

 finer longitudinal sculpture, the points of intersection being distinctly granulate, 

 labial rib large and prominent ; one or more of the whorls having a conspicuous 

 varix ; suture not so deep as in N. incrassata. ; canal rather wider ; internal 

 sculpture of the outer lip more distinctly denticulate and prominent. 



Dimensions. — L. 10 mm. B. 6 mm. 



Distribution. — Recent: Coralline zone on the coasts of South Devon, Dorset, 

 and Cornwall (Jeffreys). Connemara, Bantry Bay, Dublin Bay, Antrim. 



West European : Mediterranean (generally diffused), iEgean, Black Sea, Crimea. 

 Fossil: Coralline Crag : Sutton (?). Butleyan: Butley. Wexford 

 (A. Bell). 



Pleistocene : Nar brickearth, Holderness drift, Selsey, Worden, Irish estuarine 

 clays. Boulder Clay : Ireland. 



Scaldisien : Heyst (Belgium). 



Pleistocene : Reggio (Seguenza). Sub-Etnaean beds, Nizzeti, San Paulo (Scalia). 

 Tapex-bimks, Christiania fiord. 



Remarks. — N. pyamsea belongs to the incrassata group, but may be distinguished 

 from that species by its finer longitudinal sculpture and by the presence of a strong 

 conspicuous varix on at least one of the lower whorls, probably the labial rib, 

 as Jeffreys points out, of a former stage of repose during the growth of the 

 organism. 



Wood records it with some doubt from the Coralline Crag of Sutton, but Jeffreys 

 was disposed to regard the unique specimen known from that place as a variety 

 of N. incrassata.. Both Wood and Jeffreys, however, report it, on the authority 

 of Mr. A. Bell, from the Red Crag of Butley. Unfortunately Mr. Bell's shell 

 cannot now be found. For the assistance of collectors, who should look out for it, 

 I have figured a recent specimen from the Mediterranean; it may have been taken 

 at other Crag horizons, not improbably, for a dwarf form of some other species. I 

 have also given an example from the Rose collection at the Norwich Museum, 

 obtained from some sections, now inaccessible, in the Post- Pliocene brickearth of 

 the Nar valley. 



43 



