. Bulletin - United States National Museum. Science. vol. 2, pt. 2.] A TAXONOMIC STUDY OF THE SALPIDAE METCALF. 95 Cat. No. 6624, (aggregated form), Albatross station D. 5155; Sulu Archipelago, Tawi Tawi Group; February 19, 1908; sur- face; surface temperature, 81° F.; 1 specimen. SALPA CYLINDRICA, solitary form. In the general shape of the body the solitary form of Salpa cylindrica (fig. 82) resembles that of other species of the true Salpas. The nine body muscles are all continuous dorsally across the mid line. Ven- trally they all extend farther down than in Salpa maxima or S. fusi
. Bulletin - United States National Museum. Science. vol. 2, pt. 2.] A TAXONOMIC STUDY OF THE SALPIDAE METCALF. 95 Cat. No. 6624, (aggregated form), Albatross station D. 5155; Sulu Archipelago, Tawi Tawi Group; February 19, 1908; sur- face; surface temperature, 81° F.; 1 specimen. SALPA CYLINDRICA, solitary form. In the general shape of the body the solitary form of Salpa cylindrica (fig. 82) resembles that of other species of the true Salpas. The nine body muscles are all continuous dorsally across the mid line. Ven- trally they all extend farther down than in Salpa maxima or S. fusi- formis, but do not reach the mid-ventral line. Body muscles I to IV are in contact dorsally. As in the other true Salpae, the intermediate muscle is associated with the oral muscles rather than the body muscles. There is a single oral retractor muscle, which gives rise directly to the two sphincters of the lower lip and is in contact with the basal ends of the admarginal sphincter of the dorsal lip. A second, broader sphincter of the upper lip passes inside the oral retractor muscle, just JX J2ZT M %. Fig. 82.—Salpa cylindrica, solitary form, viewed from the right side. X 6 diameters. frm Hitter (1905) with modifications. in front of the intermediate muscle. The short dorsal longitudinal muscle of the oral series is not in contact with the oral sphincters or the intermediate muscle, but is independent. There is a well-developed atrial retractor muscle on each side, similar to the corresponding muscle of Salpa maxima. The arrange- ment of the atrial sphincters is also somewhat similar in the two species. The gut is a compact "nucleus," as in the other true Salpas. The stolon is straight, lying below the endostyle. The eye is in the usual horse-shoe form. The neural glands and their ducts are in the usual condition, but there are no outgrowths from the ganglion SALPA CYLINDRICA, aggregated form. This form (figs. 83 and 84) has hollow conical anterior and poste
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