. Bulletin - United States National Museum. Science. 150 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. Atlantic Ocean off Rio Janeiro. He does not indicate the number of specimens he had. The individuals were 20 mm. long. Apstein (1894, h and 1904) describes well-developed zooids, mm. and 3 mm. long, still attached to the stolon of the parent, so that the connection between the solitary and aggregated forms is established. He reports (1906, h) numerous specimens from the collections of the Tiefsee Ex- pedition, agreeing exactly with those from the Plankton Expe- dition. Dober (1912) figures
. Bulletin - United States National Museum. Science. 150 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. Atlantic Ocean off Rio Janeiro. He does not indicate the number of specimens he had. The individuals were 20 mm. long. Apstein (1894, h and 1904) describes well-developed zooids, mm. and 3 mm. long, still attached to the stolon of the parent, so that the connection between the solitary and aggregated forms is established. He reports (1906, h) numerous specimens from the collections of the Tiefsee Ex- pedition, agreeing exactly with those from the Plankton Expe- dition. Dober (1912) figures an individual from the Tiefsee col- lections which is clearly the same as Traustedt's original form. Traustedt and Dober both figure the ganglion and eye as seen in surface view. Our knowledge of the aggre- gated zooid of the species multi- tentaculata is thus considerable, though not complete as to the oral and atrial musculature. Dober's figure is here copied (fig. 135) and also Apstein's (1904) side view of a much younger individual (fig. 136). The index letters and figures are mine and show *the ho- mologies with other species. I would call attention to the fact that there are but two well developed body muscles. The first of these is evidently double. The second is branched in the same way as is body muscle IV in the solitary forms of this species and Traustedtia multiten- t-aculata, form bicristafa. We seem, therefore, to have four body muscles in the solitary form and three in the aggregated zooids. The next posterior muscle corresponds to the one which in the solitary individuals we interpreted as either a fifth body muscle or a basal atrial sphincter. Neither Dober's nor Apstein's figure shows other atrial muscles clearly enough for us to discuss them. Apstein shows a well developed intermediate muscle complete across the dorsal surface. Dober shows what appears to be a double intermediate muscle, the posterior portion reduced to a vestige at the angle of the mouth, t
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