6 



paper by Dr. E. L. Mark, on the maturation, fecundation, and 

 segmentation of Limax campestris ; 5 pi., pp. 552. Besides a 

 general review of what is known of the same phenomena in other 

 classes of the animal kingdom, based upon his own researches on 

 this difficult subject, Dr. Mark has added an exhaustive bibli- 

 ography. 



I have also undertaken, in connection with Professor Faxon 

 and Dr. Mark, to issue in the Museum Memoirs a " Selection 

 from Embryological Monographs," which will contain 4to illus- 

 trations compiled from monographs scattered through innumera- 

 ble scientific transactions and periodicals, and serve as an atlas 

 to accompany any text-book on Embryology, such as Kolliker, 

 Balbiani, Balfour, etc. Such a publication will, I hope, be found 

 most useful to students and teachers. The 4to illustrations will 

 be accompanied by a carefully prepared description of the plates, 

 and an 8vo bibliographical list. The 4to illustrations and the 

 bibliographical lists will be issued in parts limited to special 

 groups of the animal kingdom. 



The first part of the illustrations " Crustacea," has been pre- 

 pared by Professor Faxon, and was published during this summer. 

 Mem. M. C. Z. IX, No. 1 ; 14 pi., with an explanation of the 

 Plates, June, 1882. Professor Faxon also prepared the Bibliogra- 

 phy to accompany the Crustacea ; it was published in March, 1882. 

 Bull. M. C. Z. IX. No. 6 ; pp. 53. I have myself prepared the 

 Bibliography of the Echinoderms. This was published in August, 

 1882. Bull. M. C. Z. X. No. 2, pp. 30, and I hope to finish the 

 selection of the illustrations for the Echinoderms in time to issue 

 the second part during this winter. Several of the plates of the 

 acalephs and polyps are finished. I shall have the assistance of 

 Dr. Fewkes in completing the preparation of this part. Professor 

 A. S. Packard, Jr., has consented to take charge of the part re- 

 lating to insects. 



Other memoirs have also been prepared by the officers of the 

 Museum and published elsewhere. They will be found mentioned 

 in the reports of the special departments. I may mention spe- 

 cially the final Report on the Ophiuridae of the "Challenger" 

 expedition by Mr. Theodore Lyman, forming a part of Vol. IV. 

 of the Zoological Results of the " Challenger." The preliminary 

 Reports in the " Comptes Rendus " of some of the Crustacea col- 

 lected by the " Blake " by Professor Alphonse Milne-Edwards ; I 



