. Bulletin - United States National Museum. Science. FIG. !<2. Iasis ZONARIA, SOLITARY FORM, A SAGITTAL SECTION OF THE ANTERIOR PART OF THE BODY. X 4 DIAMETERS. (DRAWN BY HOYT S. HOPKINS.) equally inturned to serve as valves. The upper lip is somewhat inturned, though less than the lower lip, in some other species (see Salpa maxima, aggregated, fig. 69, p. 88, Thalia democratica, solitary and aggregated, fig. 104 B, p. Ill, also figs. 105 and 108). The musculature of the atrial siphon (fig. 93), in all my specimens agree, except for minor detail, with Streiff's description. There is a
. Bulletin - United States National Museum. Science. FIG. !<2. Iasis ZONARIA, SOLITARY FORM, A SAGITTAL SECTION OF THE ANTERIOR PART OF THE BODY. X 4 DIAMETERS. (DRAWN BY HOYT S. HOPKINS.) equally inturned to serve as valves. The upper lip is somewhat inturned, though less than the lower lip, in some other species (see Salpa maxima, aggregated, fig. 69, p. 88, Thalia democratica, solitary and aggregated, fig. 104 B, p. Ill, also figs. 105 and 108). The musculature of the atrial siphon (fig. 93), in all my specimens agree, except for minor detail, with Streiff's description. There is a as. s Fig. 93.—Iasis zonaria, solitary form, dorsal view of the right side and a little of the left side of the atrial musculature, the atrial siphon being cut lengthwise on the ventral mid line and the flaps so formed spread out lateeally. x 13i diameters. modified from streiff (1908). strong atrial retractor muscle (a. r.) on each side running to near the angle of the atrial opening. The ventral lip of the atrial opening bears three sphincters. The first of these (v. s. 1), admarginal, is continuous with the admarginal sphincter (a. s. 1) of the dorsal atrial lip. The second ventral sphincter (v. s. 2) extends forward, crossing the atrial retractor near its distal end. Near the angle of the atrial. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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