132 THE NAUTILUS. 



NOTES. 



Oliva peruviana vadi, new name. — This is the brown variety 

 of Oliva 2)eruviuna Lamarck, described in The Nautilus volume 

 24 (1911), p. 122 and also referred to in The Nautilus volume 

 29 (1915), p. 67 as Oliva peruviana castanea ' Ford' Johnson, 

 from Peru; but it is not Oliva flammulata castanea Dautzenberg 

 from West Africa, described in the Actes de la Societe Linne- 

 enne de Bordeaux volume 64 (1910), p. 79. The name castanea 

 ' Ford ' Johnson being preoccupied by castanea Dautzenberg, I 

 propose the name vadi for the Peruvian shell. The types are 

 tray number 111703, in the collection of the Academy of 

 Natural Sciences from Peru. This variety is figured in Reeve's 

 Conchologia Tconica volume 6 (1850), Monograph of the genus 

 Oliva plate 9 figure 14c., and also in Tryon's Manual of Con- 

 chology volume 5, plate 18, figure 57. — E. G. Vanatta. 



PUBLICATIONS KECEIVED. 



The Mollusca of Georgian Bay. By A. D. Robertson, B. A., 

 University of Toronto. Contrib. to Canadian Biology, Fasci- 

 culus II, Ottawa, 1815, pp. 95-111 ; 3 plates. An interesting 

 study of the forms of a restricted area. 37 species are listed 

 from Go Home Bay, with notes on their stations and characters, 

 especially such as seem correlated with the conditions of life. 

 "In general the species of Mollusca exhibit great flexibility in 

 their environmental relations. In many cases ecological selec- 

 tion is operative within broad limits, Avhile in a few the 

 environmental type is more or less specific. The chief factors 

 in this selection appear to be (a) exposed or protected situation, 

 (b) depth of water, (c) degree of aeration, (d) character of the 

 bottom, and (e) food conditions. In the genus Lymnaea, the 

 long-spired forms occur in the stagnant bays, while the short- 

 spired ones inhabit rocky shores." Most of the species are 

 illustrated on three excellent plates. 



