Bull. U. S. B. F. , 1909. 
Plate XLVII. 
Fig. i. — Part of section parallel to long axis of gill, showing three transverse rows of filaments, cut crosswise, and their double 
tubular character; af and ef , afferent and efferent division of filament. Enlarged 27 times. 
Fig. 2. — Diagram of transverse section of lobster’s gill, viewed as a transparency, to show probable course of circulating blood 
as indicated by arrows; af. v, branchial stem afferent; ef. v, branchial stem efferent; c v, circular vessel;/, gill filament The 
relations of the two divisions of the filament to the two divisions of the stem are shown in but few cases only. All filaments 
communicate with the stem afferent on the one hand and with the stem efferent on the other 
Fig. 3 — Transverse section of oviduct of adult lobster immediately before egg-laying, showing its glandular lining epithelium 
greatly distended. 
Fig. 4.— Transverse section of oviduct of adult lobster taken immediately after egg-laying, showing the shrunken and vesiculated 
character of its epithelium. 
