ASCIDIANS OF THE PHILIPPINES — VAN NAME. 91 



Three sizes of transverse vessels, the smallest of which may either 

 cross or divide the stigmata. Five to seven stigmata usually inter- 

 vene between internal longitudinal vessels on the intervals between 

 folds. 



Margin of anus lobed. 



Ovaries long and tubular with the testes arranged along their sides. 

 The gonads are however very immature and their number was not 

 determined. 



STYELA MAEANDRIA Sluiter, 1904. 



1904. Styela maeandria Sluiter, Siboga-'Exped.., vol. 56ff. p. 77, pi. 9, figs. 18-20. 

 1909. Tethyum maeandrium Hartmyeb, Bronn's Tier-reich, vol. 3, suppl., p. 1359. 



The single specimen which the writer has identified provisionally 

 with this species is quite regularly egg-shaped, attached by the small 

 end, and has the apertures very near together at the other end, the 

 branchial being almost exactly terminal. 

 Both are 4-lobed and only slightly promi- 

 nent in the preserved specimen. Test thin 

 and tough, the outside yellow, becoming 

 browner anteriorly; the inner surface is 

 yellowish and slightly pearly; the sub- 

 stance on section yellowish white. The 

 outer surface is minutely wrinkled, the 

 wrinkles being mainly transverse and 

 very close together, especially in the pos- 



„ ,, . , m1 • -, , Figs. 44, 45. — Styela maean- 



terior parts ot the body. The rides be- DKIA smjiteb. 44, exter- 

 tween these wrinkles are broken up into NAL VIEW - x 1 - 1 - 45 « DoR - 



, ■. , • , . , , SAL, TDBEUCLB. X 12.5. 



minute elevations which are coarser and 



more prominent near the apertures. Height of specimen 31 mm.: 



greatest transverse diameter 18 mm. 



Mantle rather thin but with its transverse and longitudinal muscu- 

 lar layers forming fairly continuous sheets. 



The tentacles could not be satisfactorily counted. 



Dorsal tubercle of circular outline, its orifice simply C-shaped with 

 the open interval to the left and somewhat forward. Horns not 

 incurved. 



Dorsal lamina irregularly notched along the posterior part. 



Branchial sac with four folds on each side separated by wide 

 intervals. Transverse vessels numerous, of several sizes rather irregu- 

 larly arranged in some parts of the sac, but in other parts more 

 regularly; even the smallest generally separate rows of stigmata. 

 Internal longitudinal vessels very numerous, closely placed on the 

 intervals as well as on the folds. Even on the intervals they are 

 generally separated by from two to four stigmata only. Stigmata 



