12 ANNUAL REPORT OF THE 



173. Parker, G. H. — Double Hens' Eggs. Amer. Nat., Vol. 40, No. 



469, p. 13-25. January, 1906. 



174. Smith, G. — The Eyes of Certain Pulmonate Gasteropods, with 



special Reference to the Neurofibrillae in Limax maximus. 

 Bull. Mus. Comp. Zool. Harvard Coll., Vol. 48, No. 3, p. 

 231-283, 4 pis. April, 1906. 



175. Castle, W. E., and Forbes, A. — Heredity of Hair-Length in 



Guinea-Pigs and its Bearing on the Theory of Pure Gametes. 

 Publ. Carnegie Inst. Washington, No. 49, p. 1-14. Ma} T , 

 1906. 



176. Castle, W. E. — The Origin of a Polydactylous Race of Guinea- 



Pigs. Publ. Carnegie Inst. Washington, No. 49, p. 15-29. 

 May, 1906. 



177. Castle, W. E., Carpenter, F. W., Clark, A. H., Mast, S. O., 



and Barrows, W. M. — The Effects of Inbreeding, Cross- 

 breeding, and Selection upon the Fertilit}' and Variability of 

 Drosophila. Proc. Amer. Acad. Arts and Sci., Vol. 41, No. 

 33, p. 729-786. May, 1906. 



178. Pearse, A. S. — Reactions of Tubularia crocea (Ag.). Amer. 



Nat., Vol. 40, No. 474, p. 401-407. June, 1906. 



179. Mark, E. L., and Copeland, M. — Some Stages in the Sperma- 



togenesis of the Honey Bee. Proc. Amer. Acad. Arts and 

 Sci., Vol. 42, No. 5, p. 101-112, 1 pi. June, 1906. 



