File:The embryology and metamorphosis of the Macroura (1891) (14589642960).jpg

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Identifier: embryologymetamo00brook (find matches)
Title: The embryology and metamorphosis of the Macroura
Year: 1891 (1890s)
Authors: Brooks, William Keith, 1848-1908 Herrick, Francis Hobart, 1858-1940 National Academy of Sciences (U.S.)
Subjects: Crustacea Crustacea
Publisher: (Washington : National Academy of Sciences : Government Printing Office
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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plate (T)p.)—which is characteristic of a later stage(Fig. 153, Dp.). The strictly superficial cells of the dorsal plate are probablj in allcases ectoblast, and some of the wandering cells degenerate before they reach thesurface ectoblast. There seems to be a general dispersal of wandering cells from the vicinity of thethoracicoabdominal fold. The wandering cells which appear in this part were takenfrom four consecutive sections, including that represented in the drawing. xCl. REFERENCE LETTERS. ^ A. I, lirst antenna. A. II, second antenna. an., lower margin of optic lobe. A. a. a., superior abdominal artery. li. C, blood corpuscle. b.m., basement membr.ane. cA., eggshell. Dp., dorsal plate. End., endoderm. O. IV-XniI, segmental ganglia. Gl., gangliogen. H., heart. hd., hypodermis. Hg., hindgut. mes., mesoblast. jiio., month. ms., ma., wandering cells at surface. O. L., optic lobe. Rt., retinogeii. Std., stomodicum. Th. db., thoracic-abdominal fold. j/.c, wandering cells. Plate XLV.
Text Appearing After Image:
F. H. Mrrri^h ,,/p/ St<u¥iiaM»mia^j»i^a iiMr«t ALPHEUS 554 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. Plate XLVI.(Stage IX.) Figs. 146-151. Serial trausverse sectious, through the embryo oi A. saukyi, at the time vrhenpigment is first deposited in the eye. In Fig. 146 the developmental history of theretinal layer is well shown. x230. Fig. loU. Nearly median longitudinal section of embryo in similar stage. x58. Pig. 153. Sagittal section of similar embryo, showing degenerating elements in yolk below «lorsalplate. X 58. REFERENCE LETTERS. J. I, first anteuna. A. II, second aatenna.Ab., abdomen. B. C, blood corpuscle.B. S., blood space.cp., carai)ace. Deg., degenerating cells. Dp., dorsal plate. End., eudoderm. /(/., foregut. fa., fiber mass of nervous system. g. II-III, brain. g.c, ganglion cell. g. VI. a., anterior gastric muscle. H., heart. hd., hypodermis. Hi/., hindgut. Lb., labrum. Md., mandible. Mes., mesoblast. ilit.f., flexor muscle. ocm., oesophageal commissure. e.g.,

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Brooks, William Keith, 1848-1908; Herrick, Francis Hobart, 1858-1940;

National Academy of Sciences (U.S.)
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