ASCIDIANS OF THE PHILIPPINES VAN NAME. 113 



Family RHODOSOMATIDAE Hartmeyer, 1908. 



In addition to the two genera of this family at present known from 

 the Philippine region, Corella Alder and Hancock, 1870, will doubt- 

 less eventually be found there, as it occurs elsewhere in the Malay 

 Archipelago and in Japan. 



Genus RHODOSOMA Ehrenberg, 1828. 



RHODOSOMA PAPILLOSUM (Stimpson), 1855. 



1855. Schizascus papillosus Stimpson, Proc. Philadelphia Acad. Sci., vol. 8, 



p. 377. 

 1885. Rhodosoma papillosum Traustedt, Vidensk. Meddel. Nat. For. Koben- 



havn, arm. 1SS4, p. 9. 

 1891. Rhodosoma papillosum Hekdman, Journ. Linn. Soc. London, Zool., 



vol. 23, p. 59S. 

 1901. Rhodosoma papillosum Hartmeyer, Archiv. f. Natur-geschichte, vol. 



07, suppl., pp. 158 and 101, pi. 4. figs. 2, 9-11. 

 1904. Rhodoso>na papillosum Sluiter, Siboga Exped., vol. 56a, p. 26, pi. 1, 



fig. 2 ; pi. 4, figs. 4-6. 

 1906. Rhodosoma papillosum Hartmeyer, Zool. Anzeiger, vol. 31, p. 25. 



1906. Rhodosoma papillosum Herdman, Ceylon Pearl Oyster Fisheries, Sup- 



plementary Report No. 39, p. 302. 



1907. (Rhodosoma) papillosum Seeliger, 'Bronn's Tier-roich, vol. 3, suppl., 



p. 1077. 

 1909. Rhodosoma papillosum Hartmeyer, Bronn's Tier-reich, vol. 3. suppl., 

 p. 1390. 



Body rounded at one end, broader and obliquely truncated at the 

 other, and attached by a large part of the right side. The truncated 

 end of the body is formed into a valve or cover hinged at the at- 

 tached side and separated from the main portion of the bod} 7 by 

 a deep mouth-like cleft lined with thin flexible test; the test else- 

 where is thicker and more rigid. The two apertures are situated 

 in the flexible test in the cleft and the valve or cover can close tightly 

 against the main part of the body, shutting off the apertures from 

 the exterior and entirely concealing them. Branchial aperture with 

 7 to 9 lobes; atrial aperture with less conspicuous lobes. Test 

 on bod} 7 and cover tough and fairly rigid, colorless and transparent, 

 with a smooth clean external surface in most of the specimens, ex- 

 cept that the margins or lips of the mouth-like cleft are studded 

 with numerous minute conical elevations, each bearing a short spine. 

 The spines are sometimes provided with one or more short lateral 

 projections. One specimen, however (that from station D5139), 

 had the body surface somewhat incrusted with foreign material. 

 Dimensions of two largest specimens (valve closed), 42 mm. by 29 

 mm. and 32 mm. by 22 mm., respectively. 



101S25 — Bull. 100—17 S 



