BIBLIOGRAPHY OF1877. 297 



Fordham (H. George). — Supposed decent Extinction of 

 Cyclostonna elegans in North Herts. — Proc Watford 

 Nat. Hist. Soc, 1877, i., pp. 172 and 173. 



Mr. John Evans, F.R.S., the president, referring (at p. 187) 

 to this note, states the shell to be comparatively abundant in 

 Southern Herts. 



Gredler (Vincenz.) — Critical Fragments. — Kritische Frag- 

 mente. — Nachrichtsblatt d. Deuts. Mai. Ges., January 1877, 

 ix., pp. I to 6. 



Heimburg (H. von). — Moiluscan Fauna of Oldenburg. — 



Zur Mollusken-Fauna von Oldenburg. — Nachrichtsblatt d. 

 Deut Mai. Ges., February and March 1877, ix., pp. 17 to 21. 



The catalogue enumerates 2 species of Avion, 2 of Liinax, a 

 Vitrina, 6 of Hyalhia, 12 of Helix, a Cionella, 4 of Fiipa, 2 of 

 Claiisilia, 3 of Succinea, a Carychiuvi, y of Li/nncsa, an Amphi- 

 peplea, 2 oi Physa, 8 oi Planorbis, an Aiicylus, 2 each oi Paltidina 

 and Bithynia, 3 each of Valvata and Uiiio, 4 of Anodonia, 5 each 

 of Cyclas and Pisidiinn, and a Dreisse7ia, with indications of 

 locality and a few general remarks. 



Ihering (Dr. Herman von). — The Reproductive Organs in 

 Succinea. — Ueber den Geschlechtsapparat von Succinea.' — 

 Jahrb. Deuts. Mai. Ges., April 1877, iv., pp. 136 to 141 and 

 woodcut. 



Ingersoll (Ernest). — On a Collection of Mollusks from 

 Utah and Colorado. — Proc. Davenport Ac. Nat. Sci., ii., 

 pp. 130 to 134. 



The collection includes of Liniax i species, of Vitritia 2, 

 Microphysa i, Zonites 2, Patitia 2, Vallonia i, Piipilla 3, Vertigo 

 I, Succinea 2, Linincea 6, Carinifex 1, Physa 3, Pianorbis i, 

 Gyraulus I, Valvata i, Fliiminicola 1, Anodonta i, SphcRriiim i, 

 and Pisidiuni i. 



