8 PUBLICATIONS OF THE 



Vol. XIX. [March-May, 1890] contains : — 



No. 1. Studies on LEPIDOSTEUS. Part I. By E. L. Mark. pp. 128. 9 Plates (Zool. 

 Lab., XV.) March, 1890. S2.50. 



No. 2. On the Egg Membranes and Micropyle of OSSEOUS FISHES. By C. H. Eigen- 

 MANN. pp.25. 3 Plates. (Zool. Lab. XVI.) March, 1890. $100. 



No. 3. Reports on the Results of DREDGING by the U. S. C. S. Steamer "Blake." 

 XXXII. Report on the NUDIBRANCHS. By Rud. Beegh. pp. 27. 3 Plates. 

 March, 1890. 75c. 



No. 4. A Third Supplement to the Fifth Volume of the TERRESTRIAL AIR-BREATH- 

 ING MOLLUSKS of the United States and Adjacent Territories. By W. G. 

 Blxney. pp. 44 11 Plates. May, 1890. $1.50. 



Vol. XX. [May, 1890-January, 1891] contains : — 



No. I. Contributions from the Zoological Laboratory. XVII. The History and Devel- 

 opment of the EYE in the LOBSTER. By G. II. Parker, pp. 60. 4 Plates. 

 May, 1890. $1.00. 



No. 2. On the Rate of GROWTH of CORALS. By Alexander Agassiz. pp. 4. 4 Plates. 

 August, 1890. 10c. 



No. 3. Preliminary Account of the FOSSIL MAMMALS from the White River and 

 Loup Fork Formations. Part II. CARNIVORA and ARTIODACTYLA. By 

 W. B. Scott. PERISSODACTYLA. By H. F. Osdorn. pp. 36. 3 Plates. 

 November, 1890. 40c. 



No. 4. Contributions from the Zoological Laboratory. XIX. CRISTATELLA: the 

 Origin and Development of the Individual in the Colony. By C. B. Daven- 

 port, pp. 52. 11 Plates. November, 1800. $1.25. 



No. 5. Contributions from the Zoological Lalioratory. XX. The EYES in BLIND 

 CRAYFISHES. By G. H. Parker, pp. 12. 1 Plate. November, 1890. 15c. 



No. 6. Notice of CALAMOCRINUS DIOMED.E, a new stalked Crinoid from the 

 Galapagos, dredged by the U S. Fish Commission Steamer "Albatross." By 

 By Alexander Agassiz. pp. 4. December, 1890. 5c. 



No. 7. Contributions from the Zoological Laboratory. XXI. The Origin and Develop- 

 ment of the CENTRAL NERVOUS SYSTEM in LIMAX MAXIMUS. By 

 Annie P. Henchman, pp. 40. 10 Plates. December, 1890. $1.25. 



No. 8. Contributions from the. Zoological Laboratory. XXII. The PARIETAL EYE 

 in some LIZARDS from the Western United States. By W. E. Ritter. pp. 

 20. 4 Plates. January, 1891. $1.00. 



Vol. XXI. [April- August, 1891] contains : — 



No. 1. Contributions from the Zoological Laboratory. XXIV. Contributions to the 



MORPHOLOGY of the TURBELLARIA. I. On the Structure of PHAGO- 



CATA GRACILIS, Leidy By W. M. Woodworth. pp. 44. 4 Plates. April, 1891. 



75c. 

 No. 2. Contributions from the Zoological Laboratory. XXV. The COMPOUND EYES 



in CRUSTACEANS. By G. H. Parker pp 98 10 Plates. May, 1891. $1.25 

 No. 3. Contributions from the Zoological Laboratory. XXVI. On some Points in the 



Anatomy and Histology of SIPUNCULUS NUDUS, L. By H. B. Ward. 



pp. 43. 3 Plates. May, 1891. 75c. 

 No. 4. THREE LETTERS from ALEXANDER AGASSIZ on the Dredging Operations 



of the "Albatross," off the WEST COAST of Central America to the 



GALAPAGOS, etc. pp. 16. June, 1891. 10c. 

 No. 5. Contributions from the Zoological Laboratory. XXVII. The Development of 



the PRONEPHROS and SEGMENTAL DUCT in AMPHIBIA. By H. H. 



Field, pp. 140 8 Plates. August, 1891. $1.75. 



Vol. XXII. contains : — 



No. 1. Contributions from the Zoological Laboratory. XXVIII. Observations on the 



Budding of Paludicella and some other Bryozoa. By C. B. Davenport, pp. 



114. 12 Plates. November, 1801. 

 No. 2. Contributions from the Zoological Laboratory. XXIX. The Gastrulation of 



AureUa flavidula, Per & Les. By Frank Smith pp. 12. 2 Plates. December, 



1891. 



