Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . f7 0,3 Fig. 11. Ochetostoma decameron. A. Ventral aspect. B. Left functional seta. ECHIURA FROM SOUTHERN AFRICA 53 Internal anatomy Alimentary canal. Alimentary canal comparatively short, consisting of a fewirregular coils (Fig. 12A). Foregut short, narrow tube of uniform diameter,terminating at ring sinus. Thin-walled presiphonal and siphonal regions ofintestine compactly filled with coarse sand grains and shell fragments. Intestinalcontents not in the form of pellets. Few thin mesenteric strands fasteningalimentary
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . f7 0,3 Fig. 11. Ochetostoma decameron. A. Ventral aspect. B. Left functional seta. ECHIURA FROM SOUTHERN AFRICA 53 Internal anatomy Alimentary canal. Alimentary canal comparatively short, consisting of a fewirregular coils (Fig. 12A). Foregut short, narrow tube of uniform diameter,terminating at ring sinus. Thin-walled presiphonal and siphonal regions ofintestine compactly filled with coarse sand grains and shell fragments. Intestinalcontents not in the form of pellets. Few thin mesenteric strands fasteningalimentary canal to body wall. A small spherical rectal caecum present. Anal vesicles. Anal vesicles thin-walled transparent tubes, about half lengthof trunk (Fig. 12A). Ciliated funnels few, unstalked over surface of both vesicles. Gonoducts. Gonoducts four pairs, white in colour; first pair anterior toventral setae while remaining three pairs postsetal in position (Fig. 12B). Presetalgonoducts smallest of all, situated just anterior to cone-shaped setal sacs andpartially obscured
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
