348 BIBLIOGRAPHY OF 1878. 



Butterell (J. Darker..)— Helix rotundata var. alba at 

 Hessle near Hull.— Hobkirk and Porritt's Naturalist, Sept. 

 1878, iv. 25. 



Five specimens taken. 



Butterell (J. Darker.)— List of the Land and Freshwater 

 Mollusca of Hull and Vicinity. — Hobkirk and Porritt's 

 Naturalist, Dec. 1878, iv., 70 to 72. 



The list includes of Sph(zrium 2, Pisidiuvi 4, Anodonfa 2, 



Neritina i, Bythinia 2, Hydrobia i, Valvata 2, Planorbis g, 



Physa 2, Lymjicea 5, Ancylus i, Arion 2, Liniax 4, Succinea 2, 



Vitrina i, Zoniies 8, Helix 18, BulimiLs i, Pupa 2, Clausilia 3, 



Achatina i, and Carychium i, species and varieties. 



Calkins (W. W.)— Note on Ranella clathrata Gray.— 

 Amer. Nat, Feb. 1878, xii., 124. 



Collected at Cedar Keys, Florida : not before known for the 



eastern coast, R. caudata being the usual form and abundant in 



Florida. 



Call (R. Ellsworth.) — Mode of Distribution of Freshwater 



Mussels. — Amer. Nat, July 1878, xii., 472 and 473. 



Unio ruhiginosus Lea, U. gibbosus Barnes, and U. pressus 

 Lea, are the subjects of this note. The first two are western 

 species, introduced to the east by means of the Erie Canal. 

 The latter otherwise a western species occurs in a small lake 

 in New York State, and the problem is, how has it been introduced. 



Call (R. Ellsworth.) — Buccinum undatum L. — Amer. Nat, 

 June 1878, xii., 397. 



Collected at Stonington, Connecticut 



Clessin (S.) A new Vitrella. — Eine neue Vitrella— Nachrichts- 

 blatt d. deuts., Mai. Ges., Jan. 1878. X. 9-10. 



V. Tschapecki. 



Conacher (John, Junr.) Limax tenellus and Anodonta 

 cygnea var incrassata, in Scotland.— Hobkirk and 



Porritt's Naturalist, July 1878, iii., 177 and 178. 



I.e., ii., Nov. 1S79 



