NASSA SOLIDA. 313 



In his classical "Manual of the Mollusca" the late S. P. Woodward, including 

 V. groenlandica in his list of Arctic species, mentions the fact that it occurs fossil 

 in the latest British Tertiaries. Miss Massy has recently reported (loc. cit.) that 

 it has been dredged by the Irish Fishery Board at 550 fathoms on the Atlantic 

 slope of the west of Ireland. 



Genus NASSA, Lamarck, 1799 (continued from p. 89). 



A sub-division of this old and classical genus was proposed in 1853 by H. and 

 A. Adams, including, for example, the use of the sub-generic name Niotlia for the 

 Nassn clathrata group, Uzita for that of A. reticosa, Tritia of N. reticulata, 1 Hinia 

 of A. incrassata, et cet. For some years these names were not in such general use 

 among Conchologists as is now the case. 



I did not introduce them when dealing with the Nassas in my first part 

 (pp. 61-89, 1914), my object being then to make my work a supplement to that 

 of my old master, and for the convenience of students of the Crag to follow so far 

 as practicable the methods employed by him. As time went on I found it desirable 

 to introduce certain changes, the adoption of the sub-generic division of the present 

 and some other groups being among them. 



Nassa solida, S. V. Wood, MS. 2 Plate XXXIII, fig. 22. 



1886. Nassa solida, S. V. Wood MS., fide Kendall and E. Q-. Bell, Quart, Journ. Geol. Soc, vol. xlii, 



p. 210. 

 1893-98. Nassa solida, A. Bell, Proc Eoy. Irish Acad. [3], vol. ii, p. 627, 1893 ; Trans. Boy. Geol. 



Soc. Cornwall, vol. xii, pp. 129, 140, pi. i, fig-. 6, 1898. 



Specific Characters. — Shell solid and massive ; whorls 6 or 7, the last much the 

 largest, depressed above ; a few of the upper ones only are ornamented by short, 

 oblique and closely-set costas, the remainder of the shell by very fine, inconspicuous 

 striee, with stronger ones near the base, and faintly by the lines of growth ; spire 

 very short, regularly tapering to an acute point : suture slight ; mouth oval, 

 angulate above; outer lip curved, with a sharply-cut triangular notch where it 

 joins the body-whorl, thickened outside, strongly denticulate internally, with a 

 prominent tooth near the canal; inner lip forming a thin and rather narrow glaze 

 upon the pillar ; pillar excavated, ending abruptly, with a sharp edge against the 

 short and hollowed canal. 



1 The authors of the " Marine Mollusca of Boussillon " prefer the sub-generic name Hinia to Tritia 

 for reasons there given (vol. i, p. 49, 1882). 



2 N. solida was first described in Mr. A. Bell's paper of 1898. 



