. Bulletin - United States National Museum. Science. 82 BULLETIN" 100, UNITED STATES NATIONAL MUSEUM. -Y,a Streiff describes the cloacal musculature as resembling the usual type for tubular cloacal siphons such as are seen in Apsteinia punctata. The gut is said by Apstein to be a compact "; Apstein's description of the eye is too meager for use in our comparisons. The Apsteinias, as I interpret their relationships, arose from forms which, like the Cyclosalpae asymmetricales, had aggregated zooids with great asymme- try. I have so grouped the species in the sub- genu
. Bulletin - United States National Museum. Science. 82 BULLETIN" 100, UNITED STATES NATIONAL MUSEUM. -Y,a Streiff describes the cloacal musculature as resembling the usual type for tubular cloacal siphons such as are seen in Apsteinia punctata. The gut is said by Apstein to be a compact "; Apstein's description of the eye is too meager for use in our comparisons. The Apsteinias, as I interpret their relationships, arose from forms which, like the Cyclosalpae asymmetricales, had aggregated zooids with great asymme- try. I have so grouped the species in the sub- genus as to show de- creasing asymmetry. (See chart on p. 158.) In the true Salpas this asymmetry is much more reduced, affect- ing none of the mus- cles except the atrial musculature, and ob- servable in the body form chiefly in the asymmetrical position of the atrial siphon and the protuberances from the body. The Apsteinias are distinguished from the Ritterias (also a sub- genus with asymmetrical aggregated zooids) by the fact that in the former subgenus the gut of both solitary and aggregated forms is a compact "nucleus," while in the Ritterias the gut of the solitary form does not form a nucleus. Subgenus Salpa (sensu strictu) (Forskal, 1775). In this subgenus I include the species maxima and its variety tuberculata, fusiformis and its form aspera, and cylindrica. I have very abundant material of all these species. Herdman's description (1888) of the poorly preserved Salpa mollis is not sufficient to allow us to discuss its validity as a species, so no further reference will be made to it. The species fusiformis may be taken as the type. The species of this subgenus are very similar to one another in form and musculature. They make a compact and well-demarcated group. The solitary forms of all have nine body muscles. The ag- gregated zooids all show more or less asymmetrical anterior and pos- terior protuberances from the body. In Salpa maxima the posterior. Please n
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