160 BULLETIK 106, UNITED STATES NATIONAL MUSEUM. 



from it in its hyperstomial ovicell. It is the only species of Amphiblestrum pro- 

 vided with round avicularia. 



Occurrence. Middle Jacksonian: Lenuds Ferry, South Carolina (very rare). 



Holotype.CvA. No. 63929, U.S.N.M. 



AMPHIBLESTRUM FLAMMEUM, new species. 



Plate 29, fig. 15. 



The zoarium incrusts rocks. The zooecia are elongated, distinct, distended, 

 and have a small narrow cryptocyst; the mural rim is thin, salient, complete, encom- 

 passing a concave cryptocyst shorter than the opesium. The opesium is oval or 

 elliptical. The ovicell is globular, salient, hyperstomial, never closed by the oper- 

 culum. The avicularia are interzooecial, much elongated, thin, and sinous in front 

 like a -flame, with a very small canal serving to lodge the mandible. 



i\ 



Measurements. Opesia 



Ao=0.20-0.25 mm. . (Lz = 0.50-0.60 mm. 



Zo=0.15-0.20 mm. Zooecia 7s = 0.30-0.35 mm. 



. , . \Lav=OAO mm. 

 Avicularia 



{/,av=().i5 mm. 



Affinities. The cryptocyst is very variable in this species; some zooecia are 

 unprovided with one and resemble those of Callopora Gray, 1848. The relations 

 between this genus and AmpMblestrum Gray, 1848. are recognized as having been 

 very close. 



The ovicell on our specimens is ornamented with neither a keel nor a callosity. 

 The affinities of this species with Callopora tenuirostris Hincks, 1880, are very great, 

 but it differs from the latter in the presence of a cryptocyst in the much smaller 

 orifice of the aviculariiim and in the much larger zooecium. 



It differs from Amphiltlestrum pfiten* in the absence of a gymnocyst, in the 

 complete mural 'rim and in a long distal canal in the avicularium. 



Occurrence. Middle Jacksonian (Castle Hayne limestone) : Wilmington. North 

 Carolina (rare). 



Holotype.Crt.. No. 63930, U.S.N.M. 



AMPHIBLESTRUM PATENS, new species. 



Plate SO. figs. 1-3. 



The zoarium incrusts shells. The zooecia are distinct, slightly elongated, wide, 

 often having a small gymnocyst; the mural rim is enlarged laterally and incom- 

 plete proximally; the cryptocyst is a little concave, distinct from the mural rim, 

 granular. The opesium is terminal, elongated, oval, finely crenulated. with a 

 straight proximal border. The ovicell is hyperstomial, never closed by the oper- 

 culum. The avicularia are interzooecial, elongated, fusiform, wide, with a short 

 distal, small canal ; the pivot is formed by two lateral denticles. The ancestrula 

 is a small, ordinary zooecium. 



