![A manual of zoology. Zoology. Fig. 301.—Development of brachioporl. (After Kowalevsky.) J.gastrula with early enterocfjelic jiouches; B, closure of blastopore; C, cfjelom separated, body annu- lated; J>, cephalic disc and mantle A manual of zoology. Zoology. Fig. 301.—Development of brachioporl. (After Kowalevsky.) J.gastrula with early enterocfjelic jiouches; B, closure of blastopore; C, cfjelom separated, body annu- lated; J>, cephalic disc and mantle](https://c8.alamy.com/comp/RE09BJ/a-manual-of-zoology-zoology-fig-301development-of-brachioporl-after-kowalevsky-jgastrula-with-early-enterocfjelic-jiouches-b-closure-of-blastopore-c-cfjelom-separated-body-annu-lated-jgt-cephalic-disc-and-mantle-developing-the-latter-with-long-setip-k-at-tached-embryo-the-mantle-lobes-folded-over-cephalic-disc-setee-omitted-c-cephalic-disc-d-dorsal-lobe-of-mantle-e-enteroccele-mantle-ventrol-man-tle-lobe-order-i-ecardines-hinge-absent-valves-similar-when-the-stalk-passes-out-between-them-ilangnla-or-unequal-when-the-ventral-is-perfo-rate-RE09BJ.jpg)
A manual of zoology. Zoology. Fig. 301.—Development of brachioporl. (After Kowalevsky.) J.gastrula with early enterocfjelic jiouches; B, closure of blastopore; C, cfjelom separated, body annu- lated; J>, cephalic disc and mantle
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