No. 2.] EMBRYOLOGY OF THE AMERICAN LOBSTER. 



251 



('86) Reichenbach, H. Studien zur Entwicklungsgeschichte des Fluss- 

 krebses. Abkandl. Senkenberg. Naturf. Gesellsch., XIV. 



('87) Nusbaum, J. Zur Embryologie der Schizopoden (Mysis chameleo). 

 Biol. Centralbl., VI. 



C87) Nusbaum, J. L'Embryologie de Mysis chameleo. Arch. Zool. Exp. 

 et Gen., V. 



('87) Kingsley, J. S. The Development of Crangon vulgaris. Bull. Essex 

 Institute, Salem, Mass., U.S.A., XVIII. 



('89) Kixgslev, J. S. The Development of Crangon vulgaris. (Third 

 Paper.) Bull. Essex Inst., XXI. 



C&g) Wilson, E. B. The Embryology of the Earthworm. Journal of Mor- 

 phology, III. 



('90) Herrick, F. H. The Development of the American Lobster. Johns 

 Hopkins University Circular, IX. 



C90) Parker, G. H. The Histology and Development of the Eye in the 

 Lobster. Bull. Mus. Comp. Zool., XX. 



EXPLANATION OF PLATES. 



Reference Letters. 



A. Proctodeum. 



Alni. Abdomipal appendage. 



an. 1 First antenna. 



an. 2 Second antenna. 



B.D. Bowl-shaped depression. 



b.s. Blood sinus. 



Ce. Compound eye. 



Cor. Blood corpuscles. 



C.N. Chromatin nebula?. 



Cut. Cuticular line. 



E-e. 1 " 5 Egg-cells. 



Ect. Ectoderm. 



Ent. Entoderm. 



fe. Follicular epithelium. 



Ft. vs. Fat-vesicles. 



Fan. Funiculus. 



fur. Furrow. 



Cm. Blastopore. 



6V -5 Ganglia. 



Hd. Hind-gut. 



J. Mandible. 



K. Keel. 



K~f. Karyokinetic figures. 



L.Gm. Lip of blastopore. 



l.m. Lenticular mass. 



Mes. Mesoderm. 



m.g. Median groove. 



Nc Connective. 



Ov.Or. Openings of oviducts. 



Pb. Plasma body. 



Pel. Procephalic lobes. 



p.e-m. Primary egg-membrane. 



Ps. Protoplasmic tract. 



Ft. Ovarian wall. 



P. Vs. Plasma vesicles. 



R-k. Polar globules. 



Seg. 2 Second segment. 



Sp. C. Spermatophoric capsule. 



Sp.Or. Spermatophoric orifice. 



Sp.p. Spermatophore. 



St. Stomodseum. 



Th.Abd. Thoracico-abdominal fold. 



T. Telson. 



V.D. Fore-gut. 



IV. " Wings " of receptive apparatus. 



Ye. Yolk-laden cells. 



