78 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



or sinuous, transparent, with an articulation at the base and a central 



canalicule with thick walls. 



Measurements. — 



r\~ ■ f^o = 0.35 mm. n • fl2 = 0.60mm. 



Opesium -L _ Zooecia<L 



Uo = 0.175mm. lZz = 0.45mm. 



Affinities and structure. — This species is very well characterized 

 by the special ornamentations of the inner face. It differs from 

 Cupuladria tuber osa new species in the absence of radial costules 

 separated by a deep furrow and in the size of the colonies. 



The tangential section of the inner face shows irregular polygons 

 with thin walls containing at times pores perforating a tissue little 

 compacted but alveolar. The tangential section in the specimens with 

 granulated costules show radial regular costules with polygonal com- 

 partments. 



The meridian thin section shows that the zoarium is formed of 

 rectangular pieces, oblique and juxtaposed, with the walls more or 

 less thickened. 



The setae are rather long; their length is about 0.7 mm. The 

 central zooecium is surrounded by eight adjacent zooecia. 



Occurrence. — D. 5161. Tinakta Island, Sulu Archipelago; 5° 10' 15" 

 N.; 119° 53' E.; 16 fathoms; fine S., blk. sp. (common). 



Cotypes.— Cat. No. 7856, U.S.N.M. 



CUPULADRIA GRANULOSA, new species 



Plate 4, figs. 5-9 



Description. — The zoarium is orbicular, little convex, with irregular 

 border. On the inner face the polygonal compartments are scarcely 

 visible; they are ornamented with granules scattered and never ad- 

 jacent. The zooecia are distinct, adjacent through their thin mural 

 rim, ogival, acuminate; the cryptocyst is very concave, smooth, much 

 enlarged at the base; the opesium is elliptical, anterior, entire. The 

 vibraculum is small, auriculated, little salient, embedded in the 

 distal zooecium. The setae are long, thin, little curved. 



Measurements. — 



• jho = 0.28-0.30 mm. ~ • fLz = 0.65 mm. 



Opesium {. „ „ Zooecium ■_ 



Uo = 0.17mm. Uz = 0.35 mm. 



Affinities. — This species differs from Cupuladria hexagonalis in its 

 little visible compartments of the inner face and in its granules smaller 

 and never adjacent. It differs from Cupuladria tuberosa in the 

 absence of large radial costules on the inner face. Finally it differs 

 from C. guineensis Busk, 1854 only in its smooth cryptocyst and in 

 the less distinct polygonal compartments of the inner face. 



Structure. — The opercular valve is an ogival arch furnished with 

 two strong lateral sclerites. The seta is long (1 mm.) thin, trans- 



