i8 



THE BRITISH NATURALIST. [January 



12. Why— when albida smd lilacina are well-marked varieties in 

 hartensis, and common in some parts— are the corresponding varieties 

 of nemoralis absent ? . 



13. Why does alhida, looking the purest white when the animal is 

 alive, appear often only a faint yellow when cleaned out ? 



14. Hortensis piscolahiata is much more common than Nemoralis 

 albolahiata. 



15. Barred and blurred specimens, fairly common in nemoralis^ 

 are to me unknown in hortensis. 



SuBFOSSiL Shells. — The following is a list of subfossil shells found 

 in Bishop's Dyke near Sherburn, in Yorkshire, Sept. 9th, 1887 : — 



Pldnorhis contorhis, albns, complanatus^ spirovhis, cornetts, vortex, 

 carinatus, LimiKsa stagnalis, palnstris, peregra, and vars. labiosa and 

 oblonga, Anodonta anatina YSiX. complanata , cygnea {smsll), Bythinia ten- 

 tactda and var. excavata and producta, Valvata piscinalis and var. stib- 

 cylindrica, Pisidium amnicum, Sphctriuni corneuin, Succinea elegans, 

 putris, Valvata cristata. 



The Dyke which was once navigable from Cawood to Sherburn 

 had not been cleared out for about a century. On the above date, a 

 number of men were digging out the mud and the shells w^ere at the 

 bottom. — Geo. Roberts, W^akefield. 



BIBLIOGRAPHY. 



The Jo2inial of Conchology , Vol. VI, No. 8, sec. 11, 1890. The 

 present number of this useful journal contains several papers of in- 

 terest : — 



P. 260. J. T. MarshalL New British Marine Shells. Two 

 species of Eulima are introduced as British, E. ephamiUa Watson, and 

 E. latipes Watson. The former was originally found off Pernambuco, 

 Mr. Marshall records it from off Aberdeen, The Minch, Sound of 

 Sleat, Arran, Plebrides, and Milford Haven. The occurrence of a 

 species thus common to S. America and Britain is interesting, as a 

 resemblance between the Crustacea of these two regions was long ago 

 observed. E. latipes is a species found in Torres Straits, and its oc- 

 currence at Land's End and the Scilly Is. is most extraordinary, if 

 the English shell is really latipes— which is doubted by Mr. E. A. 

 Smith and the Rev. Boog Watson. Mr. Marshall had previously 



