. Bulletin - United States National Museum. Science. 140 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. -/--m. musculature. His specimens of the aggregated zooids were clearly of the bicaudata character, as is shown by his "Fig. 25, Taf. 3" (my fig. 131, page 142), and they show considerable divergence from my specimens in oral and atrial muscles. PEGEA CONFEDERATA, subspecies BICAUDATA, solitary form. I have had two specimens which may be of this form. One is 5 mm. long. This was given me long ago by Prof. W. K. Brooks. Its source I do not know, nor do I know the authority f
. Bulletin - United States National Museum. Science. 140 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. -/--m. musculature. His specimens of the aggregated zooids were clearly of the bicaudata character, as is shown by his "Fig. 25, Taf. 3" (my fig. 131, page 142), and they show considerable divergence from my specimens in oral and atrial muscles. PEGEA CONFEDERATA, subspecies BICAUDATA, solitary form. I have had two specimens which may be of this form. One is 5 mm. long. This was given me long ago by Prof. W. K. Brooks. Its source I do not know, nor do I know the authority for the label bicaudata. The other embryo is 25 mm. long, but shows the eleoblast still large. Both of these embryos agree in oral musculature with Streiff's figures (bicaudata ?), but not in atrial musculature, in which they agree with confederata. Assuming that Streiff's specimens, though described as P. confederata, were really specimens of the subspecies bicaudata, I am copying his figures, giving merely enough description to call attention to the differences from Pegea confederata. Streiff describes the body muscles as agreeing exactly with those he describes and figures for the aggregated zooids (fig. 130, p. 142). Their condition agrees also with what I find in the body muscles of Pegea confede- rata. The intermediate muscle (fig. 128) is as in my speci- mens of Pegea confederata (fig. 120,p. 132),except that both its divisions are shorter ventrally, ending some dis- tance above the oral retrac- tor muscles. Streiff says the oral musculature agrees exactly with that he describes for the aggregated zooid (fig. 128). The divergence from my specimens of the solitary Pegea confederata is slight but is notice- able (fig. 120, p. 132). The oral retractor of bicaudata instead of being divided into two, a dorsal retractor and a ventral retractor, is divided into three horizontal bands, as in Thalia (fig. 105, p. 112). The oral sphincters connected with them arc as in my specimens
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