Zoological Societi/. 295 



said to be intermediate between Orchis Morio and Orchis longicornis 

 (Desfontaines) : it is from Hy^res. — Notice of the addition of Arceu- 

 tolobium {Viscum Ojcycedri) to the French flora, by IVl. Ilequien, the 

 well-known botanist of Avignon. 



Preparing for Publication. 

 A History of the British Freshwater Algce. By Arthur Hill Hassall. 



This work is intended to contain a complete account of the Modes 

 of Reproduction, Growth, Vitality, Distribution, Uses, Classification, 

 and Species of this most extensive and interesting class of plants ; 

 interesting from the importance and number of the physiological and 

 anatomical facts connected with their history. It will comprise about 

 300 pages of letter-press and seventy plates of drawings, illustrating 

 every species of the classes of Confervece and Diutomacece hitherto 

 discovered inhabiting the fresh waters of the British Isles, almost all 

 of which will be represented in their perfect state, or that of repro- 

 duction. The work is to be published by subscription. 



Names of subscribers and communications to be addressed to the 

 care of Mr. Van Voorst, Paternoster Row. 



Books Received. 



Die Sud Afrikanische Crustaceen : — The South African Crustacea. 

 4to. with Four Plates. Von Dr. Ferdinand Krauss, Stuttgard. 



Handbuch einer Geschichte der Natnr : — Manual of a History of 

 Nature. By Heinrich C. Bronn, Prof. Nat. Hist. Heidelberg. 2 vols, 

 with several Plates. 



Elements of Natural History. By Mrs. R.Lee, illustrated with en- 

 gravings on wood. [A very excellent manual for the instruction of 

 youth.] 



PROCEEDINGS OF LEARNED SOCIETIES. 



ZOOLOGICAL SOCIETY. 

 May 9, 1843. — WiUiam Yarrell, Esq., Vice-President, in the Chair. 

 The following descriptions of new species of Shells belonging to 

 the genus Cyclostoma, by Mr. G. B. Sowerby, were read. 



Cyclostoma pusiLLUM,nob., Thes. Conch, part 3. pi. 23. f. 55*. 

 Cycl. testd orbiculari, subdiscoided ; apice spirce subprominulo ; 

 anfractibus quatuor, rotundatis, lineis incrcmenti soliim striatis ; 

 suturd profunda ; aperturd circulari, peritremate tenuiusculo,sub- 

 reflexo, postice prope anfractum ultimmn subemat-ginato ; umbilico 

 patulo ; operculo multispirali, extiis concavo, margine canaliculato, 

 intus nitido. 

 Var. a. Found at the roots of shrubs and trees at Calauang, isle 

 of Luzon, by H. Cuming. 



Var. b. Found under decayed leaves in the isle of Negros, by H. 

 Cuming. 



