STROMSTEN 



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L 



A, Transverse section through Lymph Heart of Loggerhead 



Turtle Embryo, No. 236 (25 days). (Photo-micrograph.) 



B, Photo-micrograph of a Sagittal Section taken through Logger- 



head Turtle Embryo, No. SO (88 days), showing position of 

 Posterior Lymph Hearts in Body of Embryo. 



