356 



PROCEEDINGS OF THE ACADEMY OF 



[July, 



probably due to the fact that cytoplasm is distributed through the 

 yolk in the early stages and is lacking in the later ones. This suppressed 

 cleavage of the yolk in the later stages is an approach to the condition 

 found in meroblastic eggs. 



References. 

 No attempt is made in this paper to review recent important con- 

 tributions on cell-lineage, foremost among which must be mentioned 

 the important memoirs of Robert (1903) on Trochus, Wierzejski (1905) 

 on Physa, and Carazzi (1906) on Aplysia. The papers here listed are 

 those mentioned in the body of this work. 



Blochmann, F. 1(S82. Ueber die Entwicklung der Neritlna fluviatalis, Zeit. 



wiss. Zool, XXXVI. 

 Brooks, \V. K. 1879. The Acquisition and Loss of Food Yolk by Molluscan 



Eggs, Studies from Biol. Lab. Johns Hopkins University, Vol. I. 

 CoNKLiN, E. G. 1897. Tlie Embryology of Crepidula, Jour. Morph., XIII. 

 . 1902. Karkokinesis and Cytokinesis in the Maturation, Fertilization 



and Cleavage of Crepidula, Jmir. Acad. Nat. Sci. Phila., Vol. XII. 

 Crampton, H. E. 1896. Experimental Studies on Gasteropod Development, 



Arch. Eutwm., III. 

 FuJiTA, T. 1895. Preliminary Note on the Mesoderm Formation of Pulmonata. 



Zool. Mag. Tokio, Vol. VII. 

 Glaser, O. C. 1905. Ueber den Kannibalismus bei Faaciolaria tuJipa (var. 



distans) und deren larvale Excretionsorgane, Zeit. wi.ss. Zool., LXXX. 

 Hertvvig, R. 1903. Ueber Korrelation von Zell- imd Kerngrosse und ihre 



Bedeutung ftir die geschlechtliche Differenzierung und die Theilung der 



Zelle, Biol. Centrcdb., XXIII. 

 LiLLiE, F. R. 1895. The Embryology of the Unionid.ne, Jour. Morph., Vol. X. 

 McMuRRiCH, J. P. 1886. A Contribution to the Embryology of the Proso- 



branch Gasteropods, Studies from Biol. Lab. Johns HopkinsUniversity jVol.lJJ . 



. 1896. The Yollc liobe and Centrosome of Fulgur carica, Anat. Anz., XII. 



Morgan, T. H. 1893. Experimental Studies on Teleost Eggs, Anat. Anz., 



VIII. 

 Sarasin, p. 1882. Entwicklungsgeschichte der Bythinia tentaculata, Arh. 



Zool. Inst. Wilrzburg, VI. 

 ViGUiER, C. 1898. Contribution a I'etude du development de la Tethys fuii- 



hriata, Arch. Zool. Exp., 3, XVI. 

 Wilson, E. B. 1904. Experimental Studies on Germinal Localization: I. 



The Germ Regions in the Egg of Dentalium, Jour. Exp. Zool., I. 



Reference Letters. 



A, B, C, D, Macromeres. 



]a, lb, etc., First quartet cells. 



2a, 2b, etc.. Second quartet cells. 



3a, 36, etc.. Third quartet cells. 



4d, Mesentoblast. 



4.4, 4B, 4C, Secondary macromeres. 



A.L, Apical invagination. 



Bp., Blastopore. 



Cb., Cerebral ganglion. 



Be., Buccal ganglion. 



PL, Pleural ganglion. 



Pd., Pedal ganghon. 



Pa., Parietal ganglion. 



Ab., Abdominal ganglion. 



E., Eye. 



G., Gill. 



H.V., Head vesicle. 



/., Intestine. 



K., Kidney. 



Ex.K., Larval kidney. 



L.H ., Larval heart. 



L.M., "Larval mesoderm." 



M., Mantle. 



Ms., Mesodermal bands. 



O., Otocvst. 



P.G., Pedal gland. 



Sh., Shell eland. 



T., Tentacle. 



V ., Velum. 



Cm.M ., Columellar muscle. 



Oc, (Esophagus. 



