March 18, 1904.] 



SCIENCE. 



455 



nuity served as an incentive to Ms asso- 

 ciates, who were drawn closely to liim by 

 his enthusiasm and entire lack of egotism. 

 There is no doubt that in the death of 

 Professor Beecher, not only has Yale sus- 

 tained a serious loss and paleontology a 

 severe blow, but the ranks of those capable 

 of bringing to the study of fossils keen in- 

 sight and a philosophical spirit of enquiry, 

 guided by principles whose value can hard- 

 ly be exaggerated, are diminished by one 

 whom science could ill afford to lose, and 

 to whom, humanly speaking, there should 

 have remained many years of industrious 

 and fruitful research. W. H. Dall. 



8GIENTIF1G BOOKS. 



THE MARK ANNIVERSARY VOLUME.* 



Volumes in celebration of some noteworthy 

 educational event are more common in Europe 

 than with us, and naturally so. The advanced 

 courses of instruction which alone can pro- 

 duce a body of trained disciples have had only 

 about a quarter of a century's existence in 

 America. As time goes on these memorials 

 will doubtless increase in number; at present 

 they can be counted on the fingers of one hand. 



Few men have had uiore influence upon the 

 highest class of zoological work in America 

 than Professor Mark. Leaving his early 

 mathematics and astronomy, he went to Ger- 

 many, worked there with Leuckart and Haeck- 

 el and, on his return, at once entered the 

 teaching, force at Harvard. What he has ac- 

 complished during these years can only be 

 realized by reading the list of the one hundred 

 and forty former students who sign the ap- 

 preciative dedication of this volume, and by 

 examining the long list of papers turned out 

 from the laboratory under his charge. 



* ' Mark Anniversary Volume To Edward 

 Laurens Mark, Hersey Professor of Anatomy and 

 Director of the Zoological Laboratories at Har- 

 vard University, in celebration of twenty-five years 

 of successful work for the advancement of zoology, 

 from his former students, 1877-1902.' New York, 

 Henry Holt and Company. 1903. Pp. xiv + 

 513; 36 plates. 



It is impossible for one man to write a 

 critical review of the twenty-five papers which 

 are contained in this splendid quarto volume. 

 Even a bare summary of the articles will take 

 more space than this journal can spare. All 

 that can be done is to enumerate the papers, 

 with such hints of their contents as will con- 

 vey some idea of their scope. A fine photo- 

 gravure of Professor Mark forms the frontis- 

 piece; then follows the dedication, to which 

 allusion has been made, and next the papers 

 which make up the volume. These have a 

 wide range of subjects, but one thing which 

 is striking is the small number of strictly 

 embryologieal articles such as formed the 

 bulk of the work from his laboratory during 

 the first half of his labors at Harvard. 



Two of the papers deal with habits. H. P. 

 Linville deals with a couple of tube-building 

 annelids, describing among other things the 

 manner in which they build their tubes ; while 

 Jacob Reighard gives a long, detailed and 

 interesting account of the habits of Amia, 

 especially during the breeding season and the 

 care of the young. 



Four of the papers describe new species. 

 0. A. Kofoid describes a new protozoan, Pro- 

 tophrya ovicola allied to Opalina, found in 

 the food sac of Littorina rudis. S. Goto gives 

 an account of two new medusae, Olindoides 

 formosa and Oonionema depressum, from 

 Japan, pointing out that these genera with 

 Olindias, Halicalyx and Gonionemoides form 

 a natural family Olindidse, and that the prob- 

 lematical fresh-water genera Liinnocodium 

 and Limnocnida belong near them. Four 

 new species of trematodes, three of them from 

 the air passages of snakes and one from the 

 frog, form the subject of the paper by H. S. 

 Pratt, while H. P. Johnson describes three 

 species of polychsete annelids from the fresh 

 waters of the world, enumerating in his article 

 twenty-four species of the group known to 

 occur in fresh water. 



The morphological articles are more nu- 

 merous. J. H. Gerould discusses the develop- 

 ment of Sipunculus and Phascalosoma from 

 the beginning of gastrulation to the escape of 

 the larva, pointing out that the ' serosa ' of 

 Sipunculus is a modification of the prototroch 



