276 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Measurements. — 



fk -=0.35 mm. „ . \Lz =1.40 mm. 



Aperture^ ^^ mm Zooeciaj^ J() mm 



Structure. — In the interior the size of the tremopores varies accord- 

 ing to the direction of the light; the two cardelles are triangular and 

 little salient; there is no olocyst. 



The operculum is yellow and has two lateral teeth supported on 

 the cardelles; the large lateral bands are prolonged over all the 

 distal portion where they are less thickened; the surface presents 

 very elegant concentric ornamentation; there are two muscular 

 attachments some distance from the border. 



The ovicells are rare. The zoarium may cover many square 

 centimeters. 



Affinities. — This new species differs from Cosciniopsis vestita in the 

 absence of large avicularia and from C. australis Waters, 1889 in the 

 ornamentation of the operculum. 



Biology. — All our specimens were living. They were ovicelled and 

 ancestrulated February 15, 1908. Like Cosciniopsis vestita Hincks, 

 1885, this is a species of shallow waters. 

 Occurrence. — 



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; 



co. S. 

 D. 5144. Jolo Light, Jolo; 6° 05' 50" N.; 121° 02' 15" E.; 

 19 fathoms; co. S. 

 Cotypes.—C&t. Nos. 8026, 8027, U.S.N.M. 



COSCINIOPSIS FALLAX, new name 



Plate 28, fig. 7 



1891. Lepralia feegensis MacGillivray (not Busk, 1885), Description of new 

 or little-known Polyzoa, XIII, Proceedings Royal Society Victoria, 

 new ser., vol. 3, p. 81, pi. 10, fig. 1-3. 



Description. — The zoarium is unilamellar and encrusts algae or 

 bryozoa (Adeonellopsis) . The zooecia are distinct, separated by a 

 deep furrow, very large, rectangular, elongated; the frontal is convex 

 and ornamented with granulations or with very small tremopores. 

 The aperture is large, elliptical, a little elongated; two large tri- 

 angular cardelles separating a small poster from a larger anter; the 

 peristome is thin and little salient. The ovicell is enormous, buried 

 in the distal zooecium, globular, perforated by a large number of 

 small tremopores, closed by an operculum larger than that of the 

 ordinary zooecia. The two distal avicularia are long, triangular; 

 their beak is pointed toward the median axis of the zooecium. 



