ASCIDIANS OF THE PHILIPPINES VAN NAME. 



167 



AMAROUCIUM CONSTRICTUM Sluiter, 1900. 



1900. Amaroucium constrictum Sluiteb, Zool. Jahrbiicher, Syst., vol. 13, 



p. 17. pi. 1, fig. 8a. 

 1909. Amaroucium constrictum Habtjieyeb, Broun's Tier-reich, vol. 3, 



suppl., p. 1466. 



Colony in the only specimen irregularly capitate, attached by a 

 narrowed base. Test yellowish white, translucent, moderately firm, 

 the brownish zooids visible through it indistinctly. Height about 

 12 mm. ; greatest diameter of head, about 8 mm. 



Zooids small; in none of them is the post-abdomen equal to the 

 rest of the body in length. The individual 

 figured was about 3 mm. long. Branchial aper- 

 ture with 8 lobes; atrial aperture only indis- 

 tinctly lobed, and not at all produced into a 

 tube. 



A well-developed atrial languet is present; it 

 has a large middle lobe and small pointed lobe on 

 each side. 



Thorax with numerous longitudinal muscle 

 bands. 



Tentacles and dorsal languets not clearly made 

 out. 



Eight or nine rows of stigmata with appar- 

 ently about 15 in a row on each side. 



Stomach wall with 10 or 12 deep longitudinal 

 plications. 



The only specimen (No. 29) (Cat. No. 5955, 

 U.S.N.M.) is from station D5174 (off Jolo Light, 

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

 species with which the writer identifies this specimen was described 

 by Sluiter (1909) from the Chatham Islands. 



Genus APLIDIUM Savigny, 1816. 



APLIDIUM DEPRESSUM Sluiter. 1909. 



Fig. 114. — Amarou- 

 cium COSTKICTUM 



Sluiter. Zoo id. 

 X 20. 



1909. Aplidium depressum Sluiteb Siftof/a-Exped.. vol. 56b, p. 102, pi. 5, 



fig. 6. 

 1909. Aplidium depressum Hartmeyer, Bronn's Tier-reich, vol. 3, suppl., 



p. 1469. 



Largest colony of rather thin flattened form and irregular in out- 

 line, the upper surface fairly smooth. Dimensions 26 mm. by 15 mm. 

 across and not over 3 mm. thick at any point. Test fairly trans- 

 parent, not pigmented, of only moderately firm consistency. The 



