File:The microscope and its revelations (1856) (14755339496).jpg

Identifier: microscopeitsrev1856carp (find matches)
Title: The microscope and its revelations
Year: 1856 (1850s)
Authors: Carpenter, William Benjamin, 1813-1885
Subjects: Microscopy Microscopes Microscopy
Publisher: London : John Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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of Lepralice :—A, L. Hyndmanni ; b, L.figularis; c, L. verrucosa, quently the Polyzoary developes itself into an arborescentstructure (Kg. 247), which may even present somewhat of thedensity and massiveness of the stony Corals. Each individualis composed externally of a sort of sac, of which the outer ortegumentary layer is either simply membranous, or is horny,or in some instances calcified, so as to form the cell; thisinvesting sac is lined by a more delicate membrane, whichcloses its orifice, and which then becomes continuous withthe wall of the alimentary canal; this lies freely in the vis-ceral sac, floating (as it were) in the liquid which it contains.The further details of the anatomy will be best understoodfrom the examination of a characteristic example, such as theLaguncula repens; which is shown in the state of expansionat A, Fig. 246, and in the state of contraction at b and c.The mouth is surrounded by a circle of tubular tentacula, SIKrCTIJEE OF LAGLXCrLA.Fia. 246. 573
Text Appearing After Image:
Laguncula repens, as seen in its expanded state at A, and in its con-tracted state, in two different aspects, at b and c. Tlie same refe-rences answer for each figure:—a a, tentacnla clothed with vibratilecilia; h, pharvngeal cavity; c, valve separating this ca\ity fi-om d the(Esophagus; e, the stomach, with/ its pyloric valve, and g the circleof ciha surrounding that orifice; h, wall of the stomach with bUiaryfollicles; i,the iatestine, containing k escrementitious matter, andterminating at I the anus; m, the testicle; n, the ovary; o, an ovumset free from the ovary; p, openings for the escape of the ova;q, spermatozoa freely mo\ing in the caNdty that sm-rounds the vis-cera; r, retractor muscle of the angle of the aperture of the sheath; 574 POLTZOA, AND COMPOUND TUNICATA. whicli are clotlied with vibratile cilia; these tentacida, in thespecies we are considering, vary from ten to twelve in number;but in some other instances they are more numerous. By thecdiary investment of their

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