FOSSIL BRYOZOA FROM THE WEST INDIES. 81 



Genus CALLOPORA Gray, 1848. 



Callopora dumerilii var. lata, new variety. 



(Plate 1, Figure 1.) 



Membranipora dumerilii Canu, Etude des bryozoaires helvetiens de l'Egypte, Memoires de 



l'lnstitut Egyptien, VI, p. 196, plate x, fig. 7 (see for complete bibliography), 1913. 

 Membranipora dumerilii Levinsen, Mosdyr, Zoologica daniea, heft 9, p. 57, plate iv, figs. 



22-25, 1894. 

 Membranipora guernei Jullien, Resultats des campagnes scientifiques du Prince de Monaco, 



Fasc. XXIII, Bryozoaires provenant des Campagnes de l'Hirondelle, XXIII, p. 4, 



plate v, fig. 3, 1903. 

 Callopora dumerilii Norman, On "the Polyzoa of Madeira and neighboring islands, Linnean 



Society's Journal, Z00L, XXX, p. 287, 1909. 



This new variety is instituted for the form of this species in which 

 a certain number of the zocecia have only a single avicularium placed 

 in front of the opesium, as in the genus Ramphonotus. On these speci- 

 mens, moreover, there is not a single opesium resembling its neighbor, 

 but in general the elongated zocecia are less common. For this reason 

 we have believed that the American Jacksonian and the Anguilla 

 specimens should be separated as a variety. The differences from the 

 recent type specimens are slight, the larger size of the opesium measur- 

 ing 0.25 mm. in the species instead of 0.20 mm. in the variety, being 

 too small a difference for the erection of a new species. 



American occurrence. — Oligocene (Anguilla formation), southwest 

 side Crocus Bay bluffs, uppermost horizon, 125 feet above sea-level, 

 Anguilla, Leeward Islands, T. W. Vaughan, collector, 1914 (loc. No. 

 6967) ; middle Jacksonian, Wilmington, North Carolina. 



Callopora tenella Hincks, 1880. 



(Plate 5, Figure 10.) 



Membranipora tenella Hincks, Annals and Magazine Natural History (5), vol. 6, p. 25, plate 



xvi, fig. 7, 1880. 

 Membranipora tenella Jelly, A synonymic catalogue of recent marine Bryozoa, p. 167, 1889. 



Affinities. — This species is quite easily recognized by its very thin 

 mural rim and especially by its small tubercles arranged more or less 

 symmetrically on the gymnocyst. These tubercles appear to be hollow. 



The great geological distribution of this Recent species presupposes 

 a considerable corresponding geographical distribution, which has not 

 yet been observed. Osburn did not discover this species in the present 

 Gulf of Mexico. 



The species may perhaps be confused with Callopora dumerilii 

 Savigny-Audouin, 1826, in which the exterior aspect is quite similar; 

 it differs from it in the presence of nodules instead of avicularia placed 

 on the gymnocyst (and not between the opesia). 



Occurrence. — Lower Miocene (Bowden marl), Bowden, Jamaica. 



Habitat. — Florida (Hincks). 



