ASCIDIANS OF THE PHILIPPINES VAN NAME. 



163 



to be large (perhaps about 14). Those near the endostyle become 

 successively shorter. Esophagus long and narrow. Stomach oval, 

 the esophageal end with a slight and the pyloric end with an ex- 

 tensive reentrant depression where the esopha- 

 gus and intestine join the stomach. Stom- 

 ach walls smooth and only moderately thick. 

 Intestinal loop having the peculiar twisted 

 course characteristic of the genus (see fig. Ill) 

 and provided with several valvelike constric- 

 tions. Anus two-lipped. 



A dense group of 20 or 40 small oval 

 testes occupy the anterior part of the post- 

 abdomen. Posterior to, or somewhat to one 

 side of these, is the ovary, consisting of a 

 group of eggs of different sizes, one or two 

 of them often quite large. A large egg or 

 young embryo is often present in the peri- 

 branchial cavity of the thorax. What appears 

 to be the heart occupies the extreme posterior 

 part of the abdomen. 



The only specimens (No. 57, three col- 

 onies or fragments) (Cat. No. 5958, U.S.N.M.) 

 are from station D5174 (off Jolo Light. 

 Mar. 5, 1908, 20 fathoms, coarse sand). 

 In most respects they agree well with Hart- 

 meyer's type from Mauritius, the most strik- 

 ing difference being that he describes the 

 test as transparent and the zooids showing 

 through it plainly, giving the colony a 

 yellow-brown color. Such a character would, 

 however, be greatly affected by the methods and circumstances of 

 the preservation of the specimen. 



Genus AMAROUCIUM Milne-Edwards, 1841. 



AMAROUCIUM CRATERIFERUM Sluiter, 1909. 

 Plate 33, figs. 45 and 46. 



Fig. 111. — Polyclincm 



FESTUM HaRTMEYER. 



Zoom. X 14. 



1909. Amaroucium crateriferum Sluiter. Siboga -Exped., vol. 56b, p. 103, pi. 



5, fig. 7; pi. 8, fig. 11. 

 1909. Amaroucium craterifcrum Hartmeyer. Bronn's Tier-reieh, vol. 3, 



suppl., p. 1467. 



Colony so irregular and variable in form in the different specimens 

 that a general description is difficult. It is an irregular ovoid or 

 convex mass whose shape is best described as a modification of the 

 flattened capitate form, and is attached by an area variable in extent 



