The Encyclopedia Americana: A Library of Universal Knowledge ...Encyclopedia Americana Corporation, 1924 |
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Zadetki 1–3 od 68
Stran 636
... body is not that of the gastrula ; symmetry bilateral — continued . CHATOGNATHA : Small marine worms with three body segments , namely , head , trunk and tail ; with horizontal fins around tail and on sides of trunk ; with bristles ...
... body is not that of the gastrula ; symmetry bilateral — continued . CHATOGNATHA : Small marine worms with three body segments , namely , head , trunk and tail ; with horizontal fins around tail and on sides of trunk ; with bristles ...
Stran 641
... body , the terminal twigs of the tracheal system of tubes being found in con- nection with almost every bit of tissue in the body . These tracheæ open to the exterior through closeable pores , the stigmata , situated on the sides of the ...
... body , the terminal twigs of the tracheal system of tubes being found in con- nection with almost every bit of tissue in the body . These tracheæ open to the exterior through closeable pores , the stigmata , situated on the sides of the ...
Stran 642
... body and extending through several somites ; in each somite are a pair of openings , the ostia , which open into the heart from the pericardium , and through which returning blood enters the heart . Among the molluscs the heart is also ...
... body and extending through several somites ; in each somite are a pair of openings , the ostia , which open into the heart from the pericardium , and through which returning blood enters the heart . Among the molluscs the heart is also ...
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