186 



THE AMERICAN NATURALIST [Vol. XL 



Previous Investigations. — No extended account of the external 

 anatomy of Acmsea has hitherto been pubhshed; the fullest 

 description is embodied in a single paragraph by Forbes and 

 Hanley ('53, p. 436). Haller's description of the mantle and 

 gill will be discussed in subsequent sections. 



LITERATURE 



Bernard, F. 



'90. Recherches sur les organes palliaux des gasteropodes proso- 

 branches. Ann. Sci. Nat., zooL, ser. 7, vol. 9, pp. 89-404, 10 

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BOUTAN, L. 



'98. Sur le developpement de VAcmce-a virginea. Compt. Rend. Acad. 

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 BouviER, E. L. 



'87. Systeme nerveux, morphologie generale et classification des gas- 

 teropodes prosobranches. Ann. Sci. Nat., zool., ser. 7, vol. 3, 

 pp. 1-510, 19 pis. 

 Dall, W. H. 



'82. On certain Limpets and Chitons from the Deep Waters off the 

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 Davis, J. R. A. 



'95. The Habits of Limpets. Nature, vol. 51, pp. 511-512. 

 Davis, J. R. A., and Fleure, H. J. 



: 03. L. M. B. C. Memoirs. X. Patella. London, 76 pp., 4 pis. 

 Escnscnoi/rz, F. 



'33. Zoologischer Atlas. Funftes Heft, herausgegeben von D. Mar- 

 tin Pleinrich Rathke. Berlin. 

 Fisher, W. R. 



: 04. The Anatomy of Loitia gigantea. Zool. Jahrb., Abth. /. Anat., 

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 Forbes, E. 



'39. On a Shell Bank in the Irish Sea considered Zoologically and Geo- 

 logically. Ann. Nat. Hist., vol. 4, pp. 217-223. 



