286 BIBLIOGRAPHY. 



Pupa twihilicata, from Queen's Park, Edinburgh. Helix nemo- 

 ralis and H. aspersa (both very common) from North Berwick. 

 Also Helix aspersa, H. nemo?-alis and H. rotundata from Queens- 

 ferry, Fifeshire, and Pupa umbilicaia from Aberlady, Fifeshire. 

 The Secretary exhibited a series of shells collected by Mr. 

 Henry Shaw at Askern. The list included Sphcerium lacustre, 

 Pisidium nitidu7?i, Pahidina conteda, Bythinia Leachii, Valvata 

 piscinalis, Physa fontinalis van curta^ Planorbis corneiis, P. 

 carinatus var. disciformis, P. albus, Linmcea stagnalis, L. atiricu- 

 laria, Helix cantiafia, Pupa uf/ibilicata and others, particulars of 

 which are entered in the Yorkshire Record Book. Also Helix 

 fusca, H concinna and Clausilia laminaia from Cressbrook Dale, 

 Derbyshire; and Clausilia rugosa from Gourock. 



BIBLIOGRAPHY. 



Manual of Conchology, structural and systematic. — 



By Geo. W. Tryon, junr., Conservator of the Conchological 

 Section of the Academy of Natural Sciences. Part xiii. 



The fourth volume commences with the present part, which 

 is devoted to the family Nassidas, which here includes the genera 

 Northia Gray, Truncaria Adams and Reeve, Bullia Gray, of 

 which Buccinaiiops D'Orb., Pseudostrombus Klein., and Adinus 

 H. & A. Adams, are subgenera; and the typical genus, Nassa Lam. 



Some few subgenera are "retained as convenient group 

 designations, though the species varying much in their sculpture 

 cannot always be positively assigned." Such are the subgenera 

 Arcularia Link, Naytia H. and A. Adams, Aledrion Montf, 

 Zeuxis H. and A. Adams, Acicularia H. and A. Adams, Phrontis 

 H. and A. Adams, Hebra H. and A. Adams, Hima Leach, Niotia 

 H. and A. Adams, Tritia Risso, and Ilyanassa Stimpson. The 



J.C., iii., January, 1882 



