. Bulletin - United States National Museum. Science. ASCIDIANS OF THE PHILIPPINES VAN NAME. 117 Mantle thin, but with numerous muscle fibers disposed singly or in narrow bands or loose groups. On the anterior part of the body the deeper ones are mostly transverse and overlaid with longitudinal ones, these also being separate or only gathered into very narrow bands. The transverse fibers become more widely spaced and less regularly disposed (running in various oblique directions) en the middle and posterior regions of the body, and the musculature prac- tically disappears on the posterior part
. Bulletin - United States National Museum. Science. ASCIDIANS OF THE PHILIPPINES VAN NAME. 117 Mantle thin, but with numerous muscle fibers disposed singly or in narrow bands or loose groups. On the anterior part of the body the deeper ones are mostly transverse and overlaid with longitudinal ones, these also being separate or only gathered into very narrow bands. The transverse fibers become more widely spaced and less regularly disposed (running in various oblique directions) en the middle and posterior regions of the body, and the musculature prac- tically disappears on the posterior part of the left side. In one of the largest specimens about 48 tentacles were counted; the}" are of three orders, not very regularly arranged. Dorsal tubercle simple, its orifice C-shaped, U- shaped, or V-shaped in most specimens, with the open interval forward or to the right and the horns curved inward (rarely outward), but not spirally coiled. Ganglion a considerable distance back from the dorsal tubercle. Dorsal lamina with lateral ribs, narrow and plain-edged in the anterior part, wider and provided with small but not very regular slender teeth far- ther back. It passes to the left of the esophageal orifice, be- coming much lower after pass- ing the orifice, though in some specimens it can be traced a considerable distance farther back. Another membrane, also more or less denticulate, arises from the space just anterior to the esophageal orifice and is continued parallel to the dorsal lamina past the orifice on the right side and for some distance back. The papilla? along the right side of the area sur- rounding the esophageal opening (described by Heller, 1878, p. 87), were also observed in the Albatross specimens. They represent the supporting papillae of the most dorsal internal longitudinal vessel of the right side; this vessel is, however, rudimentary or wanting, and the papillae are larger and longer than usual. Branchial sac extending far back beyond the mouth of t
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