. Elementary text-book of zoology. Zoology. 96 TUNICATA. The generative organs are always united in the same animal. The formation of villi on the surface of the egg-membrane by the follicular cells surrounding the ovum is remarkable. The origin of. FIG. 564.—Development of Phallusia titcninni/lntf/ (after Kowalevski). a, Blastosphere beginning to invaginate ; Fh, segmentation cavity, b, Gastrula with blastopore (0) ; Ed, endoderm ; Ch, commencing uotochord (urochord). f, Later stage. Ek, Ectoderm ; N, rudiment of the still open neural canal, d, Stage with body and tail; Ed', eudodermal layer
. Elementary text-book of zoology. Zoology. 96 TUNICATA. The generative organs are always united in the same animal. The formation of villi on the surface of the egg-membrane by the follicular cells surrounding the ovum is remarkable. The origin of. FIG. 564.—Development of Phallusia titcninni/lntf/ (after Kowalevski). a, Blastosphere beginning to invaginate ; Fh, segmentation cavity, b, Gastrula with blastopore (0) ; Ed, endoderm ; Ch, commencing uotochord (urochord). f, Later stage. Ek, Ectoderm ; N, rudiment of the still open neural canal, d, Stage with body and tail; Ed', eudodermal layer in the tail; M, muscular cells iu tail, e, Just hatched larva ; Rg, anterior swelling of the spinal division of the neural tube ; Rm, posterior part of neural tube; Gb, dilated anterior part of neural tube (cerebral vesicle), with otolith projecting into it; F, opening of Gb ; A, eye; 0, in- vagination of mouth; Pit, pharyngeal cavity; Ed, endostyle ; D, commencing intestine ; Kl, atrial opening; Bl, blood corpuscles; JIji. papilla for attachment. /, Two days' larva (only the beginning of the tail is represented); .Ks, ^Ks, branchial stigmata: Bb, branchial vessel between them ; B, intestine. the so-called test-cells (follicle-cells which have migrated inwards) over the substance of the yolk on the inside of the egg-membrane, is also worthy of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
