52 SUPPLEMENT TO THE CRAG MOLLUSCA. 
Crrirutopsis tactza? Moller. Supplement, Tab. IV, fig. 16. 
TURRITELLA LAcTEA, Moll. Ind. Moll. Groenl., p. 9, 1842. 
— RETICULATA, Mighels and Adams. Bost. Journ., iv, p. 50, pl. iv, fig. 19. 
— — Binney. Gould’s Inv. Massach., 2nd ed., p- 318, fig. 586. 
Locality. Coralline Crag, Sutton. 
I have found a single specimen only, which is here referred to the above-named 
species, although with some doubt. The aperture of my shell is not quite perfect ; the 
figure is represented as rather too conical. 
CERITHIOPSIS TUBERCULARIS, Mont. Crag Moll., vol i, Tab. VII, fig. 5 (as Ccerithium), 
Localities. Cor. Crag, Sutton, and near Orford. Red Crag, Shottisham (Bell). 
Fluvio-marine Crag, Bramerton. Middle Glacial, Billockby. 
Specimens of this shell are abundant in the Coralline Crag at Sutton, exhibiting great 
variation, as I have shown in ‘ Crag Moll.,’ Tab. VIII, some bemg much elongated, while 
others are short and tumid ; but I have not met with a specimen having only two rows of 
tubercles, like that which has been called 0. Clarkei (‘ Brit. Moll.,’ vol. iii, p. 368, Tab. CIII, 
fig. 6). ‘This appears to be merely the absence of the middle row, a character common in 
C. perversum, where most of the upper volutions have only two. C. Barleei I do not know. 
One imperfect specimen of C. tubercularis has been found by Mr. Reeve, and fragments 
by others, in the Fluvio-marine Crag of Bramerton; and an imperfect specimen has 
occurred in the Middle Glacial of Billockby. It is given from the Red Crag, Shottisham, 
by Mr. Bell (* Ann. and Mag. Nat. Hist.,’? May, 1871). It has not been yet met with in 
the Chillesford Bed anywhere, or in the Lower Glacial Sands, to my knowledge. 
TURRITELLA INCRASSATA, J. Sow. Crag Moll., vol. i, p. 75, Tab. IX, fig. 7. 
Localities. Coralline, Red, and Fluvio-marine Crags passim, Chillesford Bed, 
Bramerton. Middle Glacial, Billockby and Hopton. 
The above name was employed by me from a belief that it was prior to the one used 
by Brocchi (Z. ¢riplicata), which 1 still believe is the case. There is a date upon the 
plate m ‘Min. Conch.’ of April 1, 1814. This species is very abundant in the Cor. 
Crag., and is very variable in ornamentation. The apex is very seldom preserved, except 
in very young individuals which have a slender form, tapering up to a point which is 
smooth and obtuse. 
Though common in the Red and Fluvio-marine Crags, it becomes rare in the Chilles- 
