PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 115 



preceding part, but not forming caecum. Rectum shows no twisting 

 or sharp curving. Anus bilobed, opens at level of second transverse 

 vessel. Circumintestinal gland consists of about a dozen longitudinal 

 tubules extending from level of pyloric end of stomach anteriorly for 

 the distance of II/2 times the stomach length ; tubules arranged horizon- 

 tally across rectum at proximal portion. Testicular follicles vary 

 from one to two dozen and occupy left side of intestinal loop posterior 

 to stomach ; ovaiy situated near center of gonad. 



Larvae from 0.8 mm. to 1 mm. in trunk length. Larval test some- 

 what frothy in appearance. Three attachment processes roundish in 

 outline in younger stages but become elongated in advanced stages. 

 About 50 ampullae found near base of attachment processes in ad- 

 vanced stages. Two pigment flecks of sensory organ arranged 

 obliquely or anteroposteriorly. 



Remarks. — A small piece of colony attached to the surface of a 

 large dead coral came up with the anchor of L.T. 535 at loc. 2 in the 

 lagoon west of Saipan on April 28, 1949, and collected and preserved 

 on May 2, 1949 (cat. no. 11504) , seems to belong to the present species, 

 although some doubts remain. It is dried, 6 mm. X 1.5 mm. in extent 

 and very thin. The test is transparent and contains many sand grains 

 embedded within, but only a small number of zooids are included. 

 The stomach is located in the posterior part of the fairly elongated 

 abdomen. This appearance of the zooid and the structure of the test 

 impregnated with sand grains are considered to indicate a close resem- 

 blance to those of E. angolanum. 



48a. Eudistoma sp. aff. angolanum (MIchaelsen) 



Figure 40 

 MATERIAL EXAMINED 



Palau Islands : North shore of Koror Island, west of Ebadul's Pier ; GVF 

 sta. CO. One colony (USNM 11403). 



Description. — A single thick encrusted colony from the Palau 

 Islands was examined. It is 15 mm. X 34 mm. in extent and about 

 10 mm. in thickness, dark purplish brown or dark brownish. 



Test is soft, leathery, thoracic stratum rather soft, whereas abdomi- 

 nal stratum and the bottom layer are hard in consistency and contain 

 fecal pellets. Surface of colony is nearly smooth, quite free from 

 foreign matter; no sj^stem of zooid arrangement seen on surface. 

 Zooids brownish, may attain 9-10 mm. in length when extended, as is 

 shown clearly l)y zooidal hollows in test. Thoraces occupy a third to 

 a fourth of entire body length in an extended state, although all are 

 fomid contracted in the present specimen. Both apertures G-lobed, 

 atrial siphon protrudes more anteriorly than branchial siphon in very 

 many examined zooids. Both longitudinal and transverse muscles 



