XV1U PROCEEDINGS OF THE 



years in this country. A photograph of this beautiful fungus, 

 as it appeared when newly gathered, was handed round for 

 inspection. 



Mr Stewart also showed a specimen of Helvetia infula, Schaeff., 

 from the same shipbuilding yard. The fungus is very rare in 

 Britain. Rev. Dr. Keith, Forres, reports that he has found it 

 in only one place in Scotland, viz., Rothiemurchus, but that it 

 has occurred in the same spot in successive seasons. It has 

 only once been found in England, viz., at King's Lynn. 



Mr. David Gregorson, F.E. I.S., showed an abnormal specimen 

 of Erica tetralix, L., having, in addition to the usual cluster 

 of flowers, a prolongation of the stem bearing a second cluster 

 at its apex. 



Mr. A. Somerville, B. Sc. , F.L.S., made some remarks on 

 Necera, a genus of lamellibranch Mollusca. After referring to 

 the interest which these shells possess on account of the 

 elegance of their form and tints, and the comparative inaccessi- 

 bility of their haunts, he gave an account of their distribution 

 in space and time, and described the morphological charac- 

 teristics of the family Corbulidce to which they belong. A 

 coloured diagram, illustrating on an enlarged scale the dis- 

 tinctive features of each species, was exhibited, along with 

 specimens of the following species dredged by him last summer 

 in the West of Scotland : 



Xeazra abbreviata, Forb — Loch Hourn, in 75 fathoms ; also 

 in Loch Alsh ; and off the Island of Rum, in 54 fathoms. 

 It also occurs sparingly in Loch Fyne. 



N. costellata (Desh .).— Lamlash Bay, in 20 fathoms; also off 

 Tarbert, Loch Fyne 



N. cuspidata (Olivi). — Occurs throughout the Firth of Clyde 

 district and the West Coast of Scotland generally. 



Mr. D. A. Boyd read a paper on some allied species of marsh 

 Hypna, of the subgenera Harpidium and Cratoneuron, in 

 which reference was made to the characteristics by which 

 these mosses may readily be distinguished. An ample series 

 of specimens was exhibited, illustrating the numerous and 

 perplexing variations in form to which some of the species 

 are subject. Among these were included the following species 

 from the North Ayrshire district : 



Hypnum eocannulaturn, H. fiuitans, L. 



(jumb. 11, jilicinwm, L., type and 



//. vemico8um, Lindb. var. vallisc/ausa 1 , Brid. 



//. Co880ni, Schpr. //. fdlcatum, Brid. 

 H. revolver!*, Sw. 



Mr. David Robertson, F.L.S., F.G.S., communicated some 

 notes on Coryste* cassivelaunus, Penn.,* and Mytilus edulis, L.+ 



* Transactions, vol. ii., p. 143. i Ibid., j>. 141. 



