216 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Affinities. — This species differs from Caberea lata Busk, 1885, in its 

 much smaller and less salient interopesial avicularia, in its very 

 different micrometric dimensions, and in its transverse and nonglob- 

 ular ovicell. It differs from Caberea rudis Busk, 1852, and from 

 Caberea grandis Hincks, 1881, from Australia, in the absence of the 

 scutum and in its transverse ovicell. 



This species is very irregular especially when it has lost its chitinous 

 appendages. The irregularity of calcification is compensated by the 

 ectocyst. As in the other genera of the family, we do not understand 

 the uses of the double opesium. The operculum closes the ovicell. 

 Occurrence. — 



D. 5134. Balukbaluk, Sulu Archipelago; 6° 44' 45" N.; 121° 48' 



E.; 25 fathoms; fne. S. 

 D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 30" E.; 



20 fathoms; S., Sh. 

 D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



W. S. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; W. S. Sh. 

 D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 



27' 15" E.; 24 fathoms; Co. S., Sh. 

 D. 5478. Tacbuc Point, Ley te; 10° 46' 24" N.; 125° 16' 30" E.; 



57 fathoms; Sh. 

 D. 5580. Sibutu Island, Darvel Bay, Borneo; 4° 52' 45" N.; 

 119° 06' 45" E.; 162 fathoms; br. S., Co.; 15.2° C. 

 Cotypes.— Cat. Nos. 7898-7902, U.S.N. M. 



Genus AMASTIGIA Busk, 1852 



(Caberiella Levinsen, 1909) 



The ovicell is small. The zoarium is continuous, inarticulated 

 (except A. Icirkpatricki); it is pluriserial on the cellular face and 

 biserial on the dorsal because of the covering of the axial zooecia; 

 the branches are semicylindrical and the zooecia open on the convex 

 face. The cilium of the dorsal vibraculum is short and without 

 teeth. The radicells issuing from the dietellae are grouped in longi- 

 tudinal bundles on the margins of the colony. Spines, scutum, 

 frontal avicularium, marginal avicularium, present or absent. 



Genotype. — Amastigia nuda Busk, 1852. Recent (Southern Hemi- 

 sphere). 



Genus NOTOPLITES Harmer, 1923 



The ovicell is large with a frontal fenestra. The dorsal vibraculum 

 is replaced by an adjacent avicularium, also with a radicular dietella. 

 The zoarium is biserial and articulated. The radicells are often 

 grouped in marginal bundles. Spines, scutum, and frontal avicularia 

 present or absent, 25 tentacles? 



Genotype. — Notoplites rostratus. Harmer, 1923. Recent. 



