. Bulletin - United States National Museum. Science. 376 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. OPERCULINA BARTSCHI, new species. Description.—-Test comparatively large, compressed except in the central region, coils rapidly widening; central portion thickened, biconvex, composed of several coiled chambers, and ornamented on the sm*facc with numerous comparatively large bosses; chambers numerous, 20 to 25 in the last-formed coil; curved sutures distinct, not ornamented, but the chambers between with numerous compar- atively large granulations, usually in somewhat definite lines across th
. Bulletin - United States National Museum. Science. 376 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. OPERCULINA BARTSCHI, new species. Description.—-Test comparatively large, compressed except in the central region, coils rapidly widening; central portion thickened, biconvex, composed of several coiled chambers, and ornamented on the sm*facc with numerous comparatively large bosses; chambers numerous, 20 to 25 in the last-formed coil; curved sutures distinct, not ornamented, but the chambers between with numerous compar- atively large granulations, usually in somewhat definite lines across the test. Diameter up to 8 mm. Distribution.—T3'pe specimen (Cat. No. 15848, ) from Albatross station D5134 Sulu Archipelago, near Basilan Island, 25 fathoms (46 meters). This has occurred at several stations in the area, as follows: China Sea, off southern Luzon; Sulu Sea, off western Mindanao; vicinity of Jolo; vicinity of Siasi; Tawi Tawi Group; off Romblon; between Pana}^ and Negros; off northern Cebu; Sogod Bay, southern Leyte; Pacific Ocean, east coast of Mindanao; Gulf of Davao; Linapacan Strait; Palawan Pas- sage; between Cebu and Boho; eastern Palawan and vicinity; east coast of Luzon; between Leyte and Mindanao; northern Mindanao and vicinity; between Negros and Siquijor; north of Tawi Tawi; and Buton Strait. This is evidently one of the varieties de- scribed by Carpenter from the Philippines. It seems to be one of the most common species of the Albatross collection from the Philippine area, and has two definite varieties, which are here indi- cated. It is closely related to the granular forms of Heterostegina which were found in this material. It is named in honor of Dr. Paul Bartsch, of the United States National Museum, whose careful collecting while in charge of the Philippine Expedition has been responsible for such abundant series of specimens. There is a local race of this species found at two stations, D5640 and D5642, both from Biiton Strait. These
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