GASTEROPODA. 17 



tells me he obtained it from the well-known phosphatic nodule pit at the above-named 

 locality. 



M. Nyst, as also M. de Konninck, appear to think the shell referred to is a species 

 distinct from PL intorta, Broc. ; and as the Belgian shell seems not to be rare, and to 

 have been found in good preservation, probably they have good means for such 

 determination. In * Crag Moll./ vol. i, tab. vi, fig. 4, I figured two specimens of which 

 the smaller one may possibly be the same as our present shell, except that it is more 

 elongated and has a less pointed termination, and as I am not imposing a new name I 

 have thought it best to figure and describe our present shell which, however, much 

 resembles fig. 13, tab i, of M. Bellardi's paper. This naturalist, however, seems to 

 consider the shell so figured by him as only a variety of Brocchi's species. 



The Waldringfield specimen is doubtless derivative, but from what formation it has 

 come is, of course, conjectural. Considering, however, the close resemblance of the Cor. 

 Crag shell which I have figured under the name Fusus Waelii to a shell which occurs at 

 Baesele, (the locality from which De Konninck describes our present species,) it is quite 

 possible that our present shell may be among the many yet unrecognised species of the 

 Cor. Crag which by the destruction of this Crag have gone to fill that museum of 

 derivatives which the Waldringfield Red Crag accumulation constitutes. 



PLEUROTOMA CURTISTOMA ? A. Bell. 2nd Sup., Tab. II, fig. 9, a, b. 



PLEUKOTOMA CURTISTOMA, A. Bell. Ann. and Mag. Nat. Hist., 1871, p. 7. 



Axis, 1 inch. 



Locality. Cor. Crag? Boy ton. 



The shell represented has been recently sent to me by Dr. Reed, and it was, he 

 tells me, obtained from the above-named locality. In colour it resembles the Coralline Crag. 

 From the description given by Mr. Bell I have referred it doubtfully to curtistoma, but I 

 have not had for examination the specimen to which Mr. Bell assigned that name, which 

 I believe has gone into the British Museum. He 'gives for it the locality Cor. Crag, 

 Gedgrave. The shell now figured is closely connected with one that I figured in my first 

 Suppt. under the name of Plemot. Bertrandi (?), Addendum Plate, fig. 4, p. 179, but 

 it has a smaller and shorter aperture. In Mr. Prestwich's List, p. 494, PL curtistoma is 

 given as a variety of Pleurot. attenuata. I think, however, that our shell is distinct, as it 

 is not attenuated and has a shorter aperture, but more and better specimens than I have 

 seen will be necessary for certain determination. 



