20 



XIX. Cristatella : the Origin and Development of the Individual in the 

 Colony. By C. B. Davenport. 52 pp., 11 pis. November, 1890. 



XX. The Eyes in Blind Crayfishes. By G. H. Parker. 10 pp., 1 pi. 

 November, 1890. 



XXI. The Origin and Development of the Central Nervous System 

 of Limax maximus. By Annie P. Henchman. 40 pp., 10 pis. Decem- 

 ber, 1890. — This paper was the result of work done at the Museum 

 by Miss Henchman while a student in the " Harvard Annex." 



XXII. The Parietal Eye in some Lizards from the Western United 

 States. By W. E. Ritter. 20 pp., 4 pis. January, 1891. 



XXIII. Preliminary Notice on Budding in Bryozoa. By C. B. Daven- 

 port. Proc. Amer. Acad. Arts and Sci., Vol. XXV. [1890]. 5 pp. 1891. 



XXIV. Contributions to the Morphology of Turbellaria. — I. On the 

 Structure of Phagocata gracilis, Leidy. By W. M. Woodworth. 44 pp., 

 4 pis. April, 1891. — This paper was presented as a thesis for Ph.D. 



XXV. The Compound Eyes of Crustacea. By G. H. Parker. 98 pp., 

 10 pis. May, 1891. — Presented as a thesis for S. D. 



XXVI. On some Points in the Anatomy and Histology of Sipunculus 

 nudus, L. By Henry B. Ward. 42 pp., 3 pis. May, 1891. 



XXVII. The Development of the Pronephros and Segmental Duct in 

 Amphibia. By Herbert H. Field. 142 pp., 8 pis. June, 1891. — Pre- 

 sented as a thesis for Ph. D. 



The plates are printed for papers by Mr. Davenport, " Observa- 

 tions on Budding in Paludicella and some other Bryozoa," — now 

 in press, — and by Mr. Frank Smith, " Gastrulation of Aurelia 

 flavidula, Per. & Les." The papers by Mr. Smith and Mr. H. P. 

 Johnson are ready for the printer, and Mr. Boyer's paper is to be 

 forwarded soon. 



The greatest need of the Zoological Laboratories at present is 

 the equipment of the Aquarium and Vivarium, to which the Cura- 

 tor called attention in former Reports. It is to be regretted that 

 the department has been so long deprived of this essential acces- 

 sory to zoological work. 



