GASTEROPODA. 9 



and the suture is deeper or more marked. The surface is smooth and without any 

 ornament. Though imperfect by the loss of the upper whorls, the specimen is otherwise 

 in good preservation, and shows these distinguishing characters clearly. ED.] 



MENESTHO ? SUTTONENSIS, S. Wood. 3rd. Sup., Tab. I, fig. 11. 



Locality. Cor. Crag, Sutton. 



The above figure represents a small shell found by myself some years ago and 

 retained until now in the hope of obtaining a better specimen. I have referred it to the 

 genus Menestho, as to which I have made some remark at p. 56 of my first Supplement. 



My shell is unfortunately not quite perfect, the outer lip being slightly broken, but it 

 much resembles the opening of Rissoa or Odostomia. The specimen is covered with four 

 rather coarse spiral lines and depressions on the lower whorl, and three on the next 

 above this, but probably it may not be a full-grown shell. The nearest figure to which 

 I have been at all able to refer it (approximately) is a very small shell, described by 

 Isaac Lea in his contributions to ' Geology,' pi. iv, fig. 84, under the name of Pasithea 

 sulcata, but, judging from this figure, my shell is distinct. Lea gives no less than nine 

 species under that generic name, several of them differing materially in characters that 

 it would be difficult to collect into one genus, and be does not specify which of these he 

 regards as the type of his genus Pasit/iea, so that I am unable to adopt that genus for 

 my present species. 



ODOSTOMIA REEVEI, S. Wood, 3rd Supp., Tab. I, fig. 12. 



Locality. Fluvio-marine Crag, Bramerton. 



The above figure represents a specimen of the above-named genus sent to me by 

 Mr. Jas. Reeve, of the Norwich museum and found by him at Bramerton in the bed 

 which yielded the specimens of Ceritldum derivatmn and Odostomia derivata described in 

 the ' Second Supplement to the Crag Moll.' (pp. 39 40). The nearest species to which 

 1 can compare it is 0. dubia, Jeff., but it differs sufficiently, I think, to be considered 

 distinct, at least as much so as several of our so-called British species. The shell is 

 somewhat thick and free from striae of any kind, the aperture measures half the length 

 of the entire shell, and is of a very ovate form, the base of it being contracted more than 

 usual in any species of this genus. The shell is rather larger than any of my specimens 

 from the Cor. Crag, with the exception of 0. conoidea and 0. turrita, which have eleven 

 volutions while the present shell has not more than four, or perhaps five. 



2 



