82 PLIOCENE MOLLUSC A. 



previously used for another shell, it was changed in 1872, in the 1st Supplement 

 to the Crag Mollusca, to N. pusiUina, being afterwards referred by Jeffreys to 

 N. Cuvieri ; it differs, however, from any variety of the latter species known to 

 me, and I therefore retain the name proposed by Wood. 



The specimen figured by the latter (1st Supph, tab. ii, fig. 7) as N. pnsiJllva, does 

 not clearly represent the normal form of this species, the sculpture of which, both 

 longitudinal and transverse, is more delicate. 



In the Addendum plate of the 1st Supplement (fig. 24), however, Wood gives a 

 shell as N. pusillina, var. variabilis, having ornamentation which approaches more 

 nearly that of the typical N. 'pusillina, though its form is different ; it is neither 

 slender nor pointed ; it may probably be a short variety. The present species, 

 which appears to be very distinct, is more or less distinctive of the later horizons 

 of the Crag, being rarely recorded from any earlier zone than the Butieyan. In 

 the Norwich Crag it was formerly met with, not infrequently, at Bramerton, and 

 Mr. W. M. Crowfoot has several specimens from the boring at Beccles. In the 

 year 1869, S. V. Wood and I found it to be fairly common in the Middle Glacial 

 sand at Billockby. A number of the specimens from that place are in the Norwich 

 Castle Museum. 



The BvTtleyan variety (PI. V, fig. 27) is usually more elongate than that from 

 the Norwich Crag (fig. 28). 



Nassa venusta, sp. nov. Plate V, fig. 18. 



Specific Characters. — Shell minute, delicate, turreted; whorls 6, slightly convex, 

 regularly tapering; sculpture 10 or 12 longitudinal costge, intersected by fine 

 spiral striee causing minute and finely chiselled nodules where they cross the 

 costee ; suture distinct ; mouth oval, with a labial notch above, and a tooth on the 

 left side of it ; outer lip ridged and denticulated within ; inner lip not folded closely 

 upon the pillar, but standing out from it, forming, except where interrupted by the 

 canal, a flat, continuous peristome; canal short and open. 



Dimensions. — L. 6 mm. B. 3 mm. 



Distribution. — Not known living. 



Fossil: Coralline Crag: Boyton. Waltonian: Little Oakley. 

 Newbournian : Newbourn, Felixstow, Sutton. 



Remarks. — I have found at Oakley about a dozen specimens of this little shell, 

 most of them beautifully perfect, and Mr. W. E. Ogden has obtained another from 

 Newbourn. They belong to the granulate group of Nassas characteristic of the 

 Waltonian Crag, but depart sufiiciently from any hitherto figured to deserve, I 

 think, specific rank. I have shown my specimens to MM. Dollf us and Dautzenberg, 

 and to the March ese di Monterosato, but none of them know any Mediterranean or 

 West European form, recent or fossil, to which they can be referred. 



