Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 Fig. 243.—Stage in the con- version of Tornaria into Bala- jjoglossus, with one pair of branchial slits (after B. Met- schnikoff), seen from the side. So, external branchial open- ing ; P, peritoneal sac; Vc, circular vessel; O, mouth; C, he\rt. Fig. 244.—Stage in the conver- sion of Tornaria into Balano- glossus, with four pairs of branchial slits (after Al. Agassiz). Letters as in figs. 242 243.

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