. Bulletin - United States National Museum. Science. 136 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. as the thorax, which arises from the posterior part of the dorsal side of the thorax, and in most zooids is directed forward (fig. 89), but it occasionally extends out at right angles to the length of the body. A long narrow neck which often becomes much bent and contracted in preservation connects the thorax and the abdomen. Vascular pro- cesses of the abdomen were not noted. Mantle musculature consisting of a superficial la}7er of narrow, rather widely spaced bands underlaid by slender group
. Bulletin - United States National Museum. Science. 136 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. as the thorax, which arises from the posterior part of the dorsal side of the thorax, and in most zooids is directed forward (fig. 89), but it occasionally extends out at right angles to the length of the body. A long narrow neck which often becomes much bent and contracted in preservation connects the thorax and the abdomen. Vascular pro- cesses of the abdomen were not noted. Mantle musculature consisting of a superficial la}7er of narrow, rather widely spaced bands underlaid by slender groups of transverse fibers so closely placed as to form a nearly continuous sheet, which @ also covers the atrial and branchial tubes. Pos- terior to the thorax the transverse muscles prac- tically disappear, though the longitudinal muscles are conspicuous even on the abdomen; the bands, however, spread out and unite with each other to form a practically continuous sheet. Tentacles apparently few; only two sizes were certainly demonstrated. Dorsal languets small, arising from the trans- verse vessels of the left side the width of about four stigmata from the median dorsal vessel. Branchial sac with only three rows of rather long narrow stigmata, with at least 18 or 20 stigmata in a row on each side. Near each end of each roAV the last few stigmata become succes- sively shorter. Stomach short and rounded, smooth-walled; margin of anus somewhat two lipped. The reproductive organs lie beside the intestinal loop and are of the t}^pe usual in this family. The male glands numbered 15 to 20 in zooids of the specimen from Bantayan mentioned below. Re- productive organs not developed in the Albatross specimens. The only colonies containing well-developed zooids are two (No. 126) (Cat. No. 6029, ), from station D5139 (off Jolo Light, Feb. 14, 1908, 20 fathoms, coral sand). Large colonies, containing very few zooids, except some in a de- generate condition, were obtained (No. Ill) (Ca
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