Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 Fro. 17i.—Vertical section through a polyp of Astroid/n calycularia (after Lacaze Duthiera). The mouth open- ing and cesophageal tube are seen as well as the me- senteries fastened to the same ; also the calcareous septa between the mesenteries, and the columella of the skeleton, . feet fissioa. According to the method, nume- rous modifications of branched stocks are dis- tinguished, , Madre- pores (fig. 176),
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 Fro. 17i.—Vertical section through a polyp of Astroid/n calycularia (after Lacaze Duthiera). The mouth open- ing and cesophageal tube are seen as well as the me- senteries fastened to the same ; also the calcareous septa between the mesenteries, and the columella of the skeleton, . feet fissioa. According to the method, nume- rous modifications of branched stocks are dis- tinguished, , Madre- pores (fig. 176), Oculi- nidce (fig. 177), and the lamellar and massive stocks as Astrcea (fig. 178) and the Miean- drinidce (fig. 179). The Anthozoa are all inhabitants of the sea, Fio. J73.—Vertical section through the cup of Ci/athi- na Cyat/ius (after Milno Edwards). S, Septa ; P, pali; C, columella. polyp, but are also the resultant of varying methods of growth by gemmation and imper-
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