. Bulletin - United States National Museum. Science. 168 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. r?. two smaller colonies are of rounded outline, much flattened, but at- tached by a somewhat narrowed base. Zooids easily visible through the test, very small (only to mm. long in the greatly contracted preserved state). Post-abdomen rather short in all the individuals. Branchial aperture G-lobed, atrial on a more or less produced tubular projection arising about the mid- dle of the dorsal part of the thorax. It is sometimes obscurely 6- lobed, in other cases net lobed at all. No atr
. Bulletin - United States National Museum. Science. 168 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. r?. two smaller colonies are of rounded outline, much flattened, but at- tached by a somewhat narrowed base. Zooids easily visible through the test, very small (only to mm. long in the greatly contracted preserved state). Post-abdomen rather short in all the individuals. Branchial aperture G-lobed, atrial on a more or less produced tubular projection arising about the mid- dle of the dorsal part of the thorax. It is sometimes obscurely 6- lobed, in other cases net lobed at all. No atrial languet. Mantle with distinct but rather widely spaced longitudinal muscle bands which are most con- spicuous on the thorax. Numerous transverse fibers, quite near together but not gathered into bands, underlie the longitudinal bands on the thorax. Tentacles, apparently about a dozen, of two sizes, placed alternately. Dorsal languets not demonstrated. Branchial sac rather short with comparatively few (probably about 6 or 7 rows of stigmata, with about 14 in a row on each side. Stomach with about a dozen deep longitudinal plications. Ovary consisting of a group of a few eggs of different sizes in the anterior part of the post-abdomen. Posterior to it the large pear-shaped or cuneate testes form a double series along the common sperm duct. Localities: No. 21. Station D5109 (off Corrigidor Light, Jan. 15, 1908, 10 fathoms, coral). One colony (Cat. No. 5903, ) No. 75. Station D5555 (off Cabalian Point, Jolo, Sept. 18, 1909, 34 fathoms, coarse sand). Two small colonies (Cat. No. 5902, ). The above-described specimens agree so nearly with Sluiter's (1909) description of A. depressum from latitude 7° 35' S., longi- tude 117° ' E., that there seems to be no reason for regarding them as distinct, though Sluiter's specimen was from much deeper water (521 meters). LITERATURE. Caullery, M. 1908. Recherches sur les Synascidies du genre Colella et considerations sur
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