108 Experimental Evolution, Variation, and Heredity 



No. 67. BANTA, A. M. The Fauna of May field's Cave. Octavo, 114 pages, 2 



plates, 13 text figures. Published 1907. Price $0.50. 



This paper represents the results of a detailed study of the fauna of a small 

 cave, observing its animal inhabitants throughout the year and in all conditions to 

 which they are normally subjected. Mayfield's Cave, about 4.5 miles from Bloom- 

 ington, Indiana, was selected for observation. The temperature and air-currents 

 were observed. Collections were made, habits of the various species noted, and life 

 histories worked out as far as possible. A bibliography at the end of the paper 

 gives an index of the work done heretofore on the cave animals of North America. 



No. 64. PEARL, RAYMOND, and A. B. CLAWSON. Variation and Correlation in the 

 Crayfish, with Special Reference to the Influence of Differentiation and 

 Homology of Parts. Octavo, 70 pp., 8 figs. Published 1907. Price $1.00. 

 The purpose of this study is to attempt by the use of appropriate biometric 

 methods to determine the part played by such factors as position, degree of dif- 

 ferentiation, and serial homology within a series of generally "like" parts of an 

 organism in determining the degree of inter-correlation displayed in the variation 

 of such parts. The fresh-water crayfish, Cambarus propinquus Girard, furnished 

 the material for the work, and the joints of the ambulatory appendages afforded 

 the series of "like" parts studied. The general result of the study is to show that, 

 as compared with physiological factors, morphological relationship is practically a 

 negligible factor in influencing degree of correlation between parts. 



No. 104. EIGENMANN, CARL H. Cave Vertebrates of America: A Study in Degen- 

 erative Evolution. Quarto, ix-)-241 pages, 31 plates, 72 text figures. 

 Published 1909. Price $5.00. 



This publication gives accounts of the nature of cave environment and the adap- 

 tations of cave animals to it; the habits of cave animals; a theory of the origin of 

 the cave fauna; the structure of the eyes of cave and the other blind vertebrates; 

 the development and later history of the eyes of the blind fish Amblyopsis; the 

 Cuban blind fishes and their eyes; and a consideration of the process and the cause 

 of the individual and phyletic degeneration of the eyes of cave vertebrates. 



No. 142. LONG, J, A., and E. L. MARK. The Maturation of the Egg of the Mouse. 

 Octavo, vi+72 pages, 7 plates, 7 figures. Published 1911. Price $1.50. 

 In this paper it is shown that the mouse does not present an exception, as 

 formerly supposed, to the rule that in maturation two polar cells are formed. By 

 means of apparatus specially devised, accurate records of the time of parturition 

 were secured, and a complete series of early stages obtained. The time of fertiliza- 

 tion was controlled by artificial insemination. It is shown that the whole process 

 of maturation is completed in from 4 to 15 hours, viz., during a period extending 

 from about 14 hours to about 29 hours after parturition; that ovulation may occur 

 at any time during that period, usually when the egg exhibits the first polar cell 

 and the second maturation spindle; that all eggs from the first polar cell, and that 

 all eggs which are penetrated by a spermatozoon, also abstrict the second polar cell. 



No. 228. CRAMPTON, HENRY E. Studies on the Variation, Distribution, and Evolu- 

 tion of the Genus Partula: The Species Inhabiting Tahiti. Quarto, 

 313 pages, 34 plates, 7 text figures. Published 1916. Price $15.00. 

 The genus Partula comprises certain terrestrial snails in Polynesia, Micronesia, 

 and Melanesia, which are relatives of the classic Achatinellidse of the Hawaiian 

 Islands. The present monograph is an exhaustive analysis of the species inhabiting 

 Tahiti the largest member of the Society Islands on the basis of material col- 

 lected by the author during four journeys, from 1906 to 1909. Of the many problems 

 investigated, the most fundamental is concerned with the relative value of congeni- 

 tal and external factors in the differentiation of the species under consideration. 

 The geographical, biological, and meteorological features of the Polynesian realm 

 are described in detail, as a basis for the determination of the subservience of the 

 snails to environmental influences. Then follows a special description of Tahiti, 

 and of separate areas from which many thousands of individuals were taken. 



