ASCIDIANS OF TITE PHILIPPINES VAN NAME. 



105 



Locality of the only specimen, No. 46 (Cat. No. 5959, U.S.N.M.) : 

 Station D5141 (off Jolo Light, 29 fathoms, coral sand, Feb. 15, 1908). 



The type and only specimen of Sluiter's species was from Salibabu 

 Island (reef). According to his description the internal longitudinal 

 vessels are considerably less numerous than in the Philippine speci- 

 men; possibly he may have made the count on a smaller and less 

 mature zooid. 



Genus EUSYNSTYELA Michaelsen, 1904. 



EUSYNSTYELA LATERICIUS (Sluiter). 1904. 



Plate 2G, fig. 9. 



1904. Gynandrocarpa latericius Sluiter, Stbo»«.-Exped., vol. 56a. p. 94, 



pi. 15, figs. 8-11. 

 1909. Polyandrocarpa latericius Hartmkyer. Bronn's Tier-reieh, vol. 3, 



suppl., p. 1370. 



Colony flat and expanded, averaging about 3 mm. thick, the upper 

 surface fairly smooth and free from adhering material, but raised 

 into low, distinctly 

 bordered, rounded 

 elevations of ellipti- 

 cal outline when seen 

 from above. Each 

 of these elevations, 

 which are usually 

 quite close together, 

 is caused by the body 

 of a zooid and bears 

 upon its surface the 

 two apertures of the 

 zooid, w h i c h are 

 raised on low flat- 

 tened conical papil- 

 lae, the branchial near the anterior end of the zooid, the atrial far 

 back on the dorsal surface. The branchial aperture is distinctly 

 square, the atrial is more nearly round. 



Dimensions of the largest colony 108 mm. by 51 mm.; length of 

 body of largest zooids 6.5 mm., width 3.5 mm. 



Test very tough and leathery; yellowish white, thick between 

 and beneath the zooids, but thin over them. Under magnification 

 minute furrows are visible on the portion over the zooids, some radi- 

 ating from the apertures, others having a elliptical course parallel 

 and concentric with the outline of the body. Owing to the tough 

 character of the test, vascular connections between the zooids, though 

 doubtless present, were not successfully traced. 



PlGS. 58-60. EUSYNSTYELA LATERICIUS (SLUITER). 58, 



Left and right sides op body of zooid. X 6. 59, 

 Part of the circle of tentacles and dousal tdbercle. 

 X 15. GO, Gonad. X 19. 



