...lower Chordata that it is with high expectations one opens his recent memoir upon the Enteropneusta.1 He describes in considerable detail many points in...their oxygenation, 1 Willey, A. Zoological Results. Ft. iii, Enteropneusta from the South Pacific, with Notes on the West Indian Species. Cambridge, University...

...disposed in zones corresponding with the epidermal annulations. The primary function of the gill-slits was the oxygenation of the gonads, their secondary...function being the respiration of the individual. In most cases the gonads have been secondarily emancipated from the gill-clefts in correlation with the...

...disposition and the gill-slits occupying the interzonal depressions. The primary function of the gill-slits was the oxygenation of the gonads, their secondary function being the respiration of the individual — the change of function having taken place pari passu with an elaboration of the vascular system....

...disposed in zones corresponding with the epidermal annulations. The primary function of the gill-slits was the oxygenation of the gonads, their secondary...function being the respiration of the individual. In most cases the gonads have been secondarily emancipated from the gill-clefts in correlation with the...

...disposed in zones corresponding with the epidermal annulations. The primary function of the gill-slits was the oxygenation of the gonads, their secondary...function being the respiration of the individual. In most cases the gonads have been secondarily emancipated from the gill-clefts in correlation with the...