68 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Australia, Victoria, Queensland, Torres Strait, Philippines (18 

 meters), Java. Different localities of the Malay region between 

 Borneo and New Guinea (0-60 meters). Straits of Corea (93 meters), 

 China Sea, Singapore (5-10 fathoms); Indian Ocean, Ceylon, [S. W. 

 India, Zanzibar (8 fathoms), Sudanese Red Sea (3-30 fathoms). 

 Plesiotypes — Cat. Nos. 7841-7844, N.S.N.M. 



ACANTHODESIA GRANDICELLA, new species 



Plate 1, figs. 9-11 



Description. — The zoarium is uni-or bilamellar; the two lamellae 

 are back to back. The zooecia are large, distinct, separated by a 

 furrow, elongated, elliptical; the mural rim is thick, regular, salient; 

 the cryptocyst is shallow, smooth, very concave. The opesium is 

 elongated, elliptical, garnished with very small spicules. 



Measurements. — 



~ • jho = 0.40-0.60 mm. ~ • \Lz = 0.60-0.85 mm. 



OpesnmVi, Zooeciai, 



1 \lo = 0.25-0.32 mm. \lz = 0.35-0.45 mm. 



Variations. — According to the rule in this genus, the zooecia are 

 broad or narrow. The series producing zooecia are a great deal 

 larger than the others. The mural rim is surmounted with a cal- 

 careous piece finely denticulated. 



Occurrence. — D. 5311. China Sea, vicinity of Hong Kong; 21° 33 ' 

 N.; 116° 15' E.; 88 fathoms; crs. S., Sh. 



Cotypes.— Cat. No. 7845, U.S.N.M. 



ACANTHODESIA LAMELLOSA, new species 



Plate 2, fig. 1 



Description. — The zoarium is a globular, plurilamellar mass, 

 attaining three centimeters in length and formed of very numerous 

 distorted and anastomosed lamellae; it is of great lightness. The 

 zooecia are distinct, separated by a slight furrow, elongated, ellip- 

 tical; the mural rim is thin, finely denticulated, salient in its distal 

 portion. The opesium is large, of the same form as the zooecia, 

 ornamented with numerous and very short spicules. The series 

 producing zooecia are much larger; the primoserial zooecia are 

 smaller. 



Measurements. — 



~ • jho = 0.40-0.50 mm. 7 • \Lz = 0.45-0.60 mm. 



Opesium ., Zooeciai-, „ „„ „ ,„ 



1 \lo = 0.20-0.35 mm. \lz = 0.30-0.45 mm. 



Affinities. — The micrometric measurements are quite variable, but 

 in the same zooeciai range they increase regularly from the primo- 

 serial zooecia to the initial zooecium of a series. The septulae are 

 mul ti porous. The opercular valve is a little removed from the 

 mural rim. In its size this species is intermediate between Acantlw- 



