ART. 14 FOSSIL AND EECENT BRYOZOA GANV AND BASSLEB 33 



an ordinary zooecium but regenerated by a falciform avicularium. 

 On our specimens from the Gulf of Mexico they are generally absent 

 or diffuse. 



Although the specimens dredged in the Philippines belong to the 

 variety albida Busk, 1885, those from the Gulf of Mexico are very 

 typical and conform to Hincks's figure of 1880. They are deprived of 

 tuberosities on the mural rim. However, we figure a curious speci- 

 men in which the zooecia are a little smaller and the mural rim is 

 ornamented with tuberosities very irregularly arranged. 



Biology. — All of our specimens were dead. We have observed 

 some cases of total regeneration. 



Occurrence. — Albatross Station D. 2167. Off Habana, Cuba; 23° 10' 

 40" N.; 82° 20' 30" W.; 201 fms.; coral. 

 Albatross Station D. 2319, North of Cuba; 23° 10' 



37" N.; 82° 20' 06" W.; 143 fms.; gray coral. 

 Pliocene : Minnitimmi Creek, Bocas Island, Almirante 



Bay, Panama. 

 Pleistocene (Mount Hope); Panama Canal Zone. 

 Plesioiy pes. —Csit. Nos. 7466, 7467, 70833, U.S.N.M. 



CALLOPORA PUMICOSA, new speciea 



Plate 3, Figure 7 



Description. — The zoarium encrusts nuUipores ; it is formed essen- 

 tially of a thin calcareous pellicle perforated by a very large number 

 of polygonal pores arranged in irregular quincunx and supporting the 

 zooecia. The latter are isolated, much separated from each other; 

 they are convex, pyriform; the gymnocyst is large and smooth. The 

 opesium is elliptical and not surrounded by a mural rim. The ovicell 

 is globular, smooth, hyperstomial, operculated, and without any con- 

 nection with the opercular valve. 



,, JL r\ • 1^0 = 0.23 mm. 



Measurements. — Opesiai, ^,^ 



^ Uo = 0.11 mm. 



[Ls = 0.45 mm. 



Zooecial, „ „_ 



Us =0.30 mm. 



Observations. — The nature of the zooecial walls and of the frontal 

 is that of Pyripora; but the ovicell is hyperstomial and there are no 

 spines. 



This is one of the most curious species dredged by the Albatross; 

 the nature and function of the porous crust are absolutely unknown 

 but nevertheless it is indeed an integral part of the colony, since the 

 zooecia can communicate among themselves only through it. The 

 biology of this species as of many other bryozoa, is absolutely enig- 

 matical. 



Occurrence. — Albatross Station D. 2639, Straits of Florida; 25° 04' 

 50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 



Holotype.— Cat. No. 7468, U.S.N.M. 

 58513—28 3 



