226 JOURNAL OF CONCHOLOGY. 



There is another curious coincidence in reference to Amer- 

 ican shells, SphcBrium ovale is considered by some conchologists 

 (Dr. Jeffreys amongst the number, I think) to be equal to 

 S. transversum of the United States, and S. ovale is found in 

 the same canal that P. dilatatus was first found. It is also 

 found in the same canal where it was found in the second 

 instance, and Mr. Bates reports that dead shells are found in 

 the canal at Burnley where P. dilatatus is found. The S. ovale 

 about Manchester seems to be dying out, owing to greater 

 pollution of the canals ; this may also be the case at Burnley. 



A Dextrai Physa fontinalis.— While collecting on 

 June 8th, at Barnes Common, Hammersmith, I took a good 

 quantity of Physa fontinalis out of the brook, and among 

 these was a dextrai one. The mouth in this last was a more 

 elongated-oval than what we find in the type generally — an 

 errant-knight from the conventionalities of an otherwise sinistral 

 genus. — J. W. Williams, D.Sc, June loth, 1887. 



Discovery of Clausilia Rolphii in North Lincoln- 

 shire. — Mr. H. Wallis Kew, who is engaged in working out 

 the moUuscan fauna of Lincolnshire, recently sent me amongst 

 other interesting species, three specimens of this uncommon 

 shell. Two of the specimens were found on the 7th of May 

 at Haugham-pasture and Maltby Wood respectively, and the 

 third on the 4th of present month at Grisel Bottom, Burwell 

 Woods. These three localities are old oak woods — Haugham- 

 pasture is really an oak wood, its local name is misleading — and 

 though not very close together are all in the same neighbour- 

 hood, and are situate on the eastern flank of the wolds ; in some 

 parts the chalk is slightly covered with clay, but it is interesting 

 to note that all three shells are from the same long post-glacial 

 ravine, where the surface is chalk. Its occurence so far re- 

 moved from its previously known area of distribution is of the 

 greatest interest. — Jno. W. Taylor, June i6th, 1887. 



J.C, v., July, 1887. 



