108 Mr. J. G. Jeffreys on British Odostomise. 



their being arranged at shorter distances. The same botanist 

 also observes, that " two branches of each whorl are almost 

 constantly compound/' and this character I have taken the 

 liberty of inserting in other words in my observations on this 

 plant. The remainder of his paper accords with my own obser- 

 vations, with exceptions which have been already noticed. I have 

 however frequently found this plant in stagnant pools, and can- 

 not as yet discover that either of the three affects peculiar situa- 

 tions. 



There is only one more remark to be made, and this respecting 

 the suspected hybrid origin of the plant ; Mr. Purchas seems to 

 imply that I held that opinion, but in my original but unpublished 

 paper it was expressly stated that my convictions were that it could 

 not be a hybrid, and the plant was therefore considered by me as 

 a species ; the unfortunate choice of a name has not unnaturally 

 conveyed a wrong impression of my views. 



XII. — Supplementary Notes on British Odostomise. 

 By J. G. Jeffreys, F.R. & L.S. 



Since the publication of my paper on this subject in the ' An- 

 nals of Natural History ' for November 1848, the discoveries of 

 that indefatigable conchologist Mr. Barlee, and the communica- 

 tions of other scientific friends, have induced me to notice the 

 following additions of species and localities : — 



Odostomia pallida var. a. Guernsey, Mr. Barlee. 

 Var. b. Loch Fyne, A. MacNab. 



O. Rissoides var. b. Lerwick, Mr. Barlee. 



O. alba var. a. This has been lately found by Mr. Alder on 

 the coasts of Northumberland and the Isle of Man, and described 

 by him in the Transactions of the Newcastle Naturalists' Club, 

 under the name of O. fulva. It appears to attain a greater size 

 than any other of the true Odostomice. 



O. nitida monstr. Lerwick, Mr. Barlee. 



O. albella var. a, minor, sutura profundiore. Lerwick, Mr. Barlee. 



O. acuta. In this species, as well as plicata and unidentata, 

 may be detected, by the aid of a good magnifying glass, faint but 

 regular spiral strise. 



O. turrita. Birtabuy Bay, co. Galway, Mr. Barlee. 



O. cylindrical Lerwick, Mr. Barlee. 



O. plicata var. a. Northumberland coast, Professor King. 

 Guernsey; Burrow Island; Mr. Barlee. 



O. unidentata. Arran Island and Birtabuy Bay, co. Galway ; 

 Burrow Island ; Mr. Barlee. 



