ZOOLOGY. 



No. 16. JENNINGS, HERBERT S. Contributions to the Study of the Behavior of 

 Lower Organisms. Octavo, 256 pages, 81 text figures. Published 1904. 

 (In cloth.) Price $1.50. 



This consists of a series of investigations of the behavior and reactions of a 

 number of lower organisms, chiefly unicellular forms; together with a discussion of 

 the theories dealing with these matters. Detailed experimental results are given for 

 the reactions of infusoria to heat and cold, and to light; for the reactions of certain 

 Rotifera to various stimuli; and a full account is presented of the movements and 

 reactions of Amoeba. The general chapters deal with the Theory of Tropisms, with 

 Physiological States as determining factors in Behavior, and with the "Method of 

 Trial and Error." 



No. 20. DUERDEN, J. E. The Coral Siderastrea radians. Quarto, v-j-130 pages, 



11 plates, 13 text figures. Published 1904. Price $1.00. 



This book sets forth the results of studies in the early stages of the development 

 of the coral Siderastrea radians, including the development of the tentacles and 

 septa as far as the third cycle and that of the mesenteries to the completion of the 

 second cycle. An account is first given of the external characters and internal 

 anatomy of the adult colony, and afterward of the development of the young 

 polyp from the free-swimming larva. The manner of appearance and the rela- 

 tionship of the tentacles, mesenteries, and septa are considered at some length, their 

 establishment being the principal object of the investigation. 



No. 32. DEAN, BASHFORD. Chim<rroid Fishes and Their Development. Quarto, 

 194 pages, 11 plates, 144 text figures. Published 1906. Price $4.00. 



A general account of a group of fishes which by some investigators has been 

 described as the most primitive of all vertebrates. The present memoir considers 

 this claim especially from the evidence contributed by the fossil members of the 

 group and by the embryonic history of a living species, the Californian Chim&ro 

 colliei. It is shown that chimaeroids are widely modified rather than primitive, 

 and in all probability are descendants of the early type of the Port Jackson shark 

 (Cestracion). The work is illustrated by beautifully executed text figures and 

 colored plates, and presents a complete list of the literature of the subject. 



No. 47. MAYER, ALFRED G. Rythmical Pulsation in Scyphomedusa. Octavo, 62 

 pages, 22 plates, 36 text figures. Published 1906. Price $0.50. 



This paper describes the effects of the cations of sea-water, sodium, magnesium, 

 calcium, and potassium upon pulsation in jellyfishes, and the hearts of salpse and of 

 turtles. It is shown that if any strip of tissue capable of pulsation be cut into the 

 shape of a closed circuit, and then set into pulsation, it will maintain itself in 

 movement for an indefinite period of time. This paper should be read in connec- 

 tion with the author's second paper on the same subject in Publication No. 102. 



No. 109. MAYER, ALFRED G. The Medusae of the World. Quarto. In three vol- 

 umes. Published 1911. Price $6.00 per volume. 



1. The Hydromedusae, pp. i-23o+xv, pi. 1-29, text figs. 1-119. 

 II. The Hydromedusae (continued), pp. 231-498 + xv, pi. 30-55, text figs. 120-327. 

 III. The Scyphomedusae, m+499-735, pi. 56-76, text figs. 328-428. 



This work is the only general treatise upon medusae which has appeared since 

 Haeckel published Das System der Medusen in 1879-80. 



The first two volumes treat of the Hydromedusae and the third is devoted to the 

 Scyphomedusas. The colored plates are all drawn from life, and, with few excep- 

 tions, are confined to the representation of American Medusae. The text figures, on 

 the other hand, chiefly represent foreign forms, and are mostly reproductions from 

 the drawings of other authors. The work presents not only a system of classifica- 

 tion for the medusae, but also devotes much attention to the philogeny, embryology, 

 physiology, regeneration, habits, and cecology of the medusae. 



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