NORTH AMERICAN LATER TERTIARY AXD QUATERNARY BRYOZOA. 83 



CALPENSIA IMPRESSA Moll. 1803. 



Plate 1, fig. 4. 



1803. Eschara impressa Moll, Die Seerinde aus der Ordnung der Planzenthiere,Wien, p. 57, pi. II, 



fig. 9. 

 1847. Eschara nohilis Michelin, Iconographie zoophytologique, p. 329, pi. 79, fig. 1. 

 1854. Membranipora calpensis Busk, Catalogue of the Marine Polyzoa, British Museum, Cheilosto- 



mata, pt. 2, p. 60, pi. 104, fig. 5, 6. 

 1879. Micropora impressa Waters, On the Bryozoa of the Bay of Naples, Annals Magazine Natural 



History, ser. 5, vol. 3, p. 1230. 

 1902. Micropora impressa Calvet, Bryozoaires marins des cotes de Corse, Travaux de I'lnstitut 



de Zoologie de TUniversite de Montpellier, ser. 2, mem. 12, p. 17. 



1910. Micropora impressa Canu, Bryozoairs fossiles de terrains du Sud. Quest de la France, Bulletin 



Societe Geologique de France, ser. 4, vol. 10, p. 844, pi. 16, fig. 6 (variety). 



1911. Micropora impressa Mme.Guerin-Ganivet, Contribution a I'etude des Bryozoaires des cotes 



Armoricaines, I, Travaux scientifique du Laboratoire de Concarneau, vol. 3, p. 5, pi. 1 

 1919. CaZpensia mprcssa Canu and Bassler, Geolog}' and Palentology of the West Indies, Bryozoa, 

 Publication of the Carnegie Institution of Washington, No. 291, p. 84, pi. 1, fig. 11. 



The discovery of this species in America was a great surprise, since it has here- 

 tofore been noted only in the Mediterranean area, where its zoaria occur in great 

 abundance, especially along the African coast. Our determination is nevertheless 

 an exact one, as we possess so many specimens for comparison that we should not 

 be mistaken. 



The bibliography of this species given by Pergens, Jelly, and Waters is incorrect, 

 for they have confounded many distinct species. Canu noted five of them in 1911. 

 In spite of its antiquity there are no unquestioned references to the species other 

 than those we have given above. 



The zoarium may be incrusting or Eschara-like. We have never observed an 

 ovicell — indeed, the species may have none. 



Occurrence. — Oligocene (Antigua formation) : Carlisle marl pit, Antigua, Lee- 

 ward Islands (rare). 



Geological distribution. — Helvetian of Brittany, France (Michelin) ; Sahelian 

 of Oran (Canu collection) ; Sicilian of Italy (Neviani) . 



Habitat. — Mediterranean: Gibraltar, Corsica, Tuscany, Naples, Adriatic, 

 Aegean Sea, Tunis, Algeria, Morocco; Atlantic off Brittany. It abounds at a depth 

 of 25-30 meters and is very common at the depths of 75-100 meters. 



Plesiotype.— Cat. No. 68513, U.S.N.M. 



Genus VERMINARIA Jullien, 1888. 



1888. Verminaria Jullien, Mission scientifique du Cap Horn. VI, Zoologie, Bryozoaires, p. 78. 



The cryptocyst bears many opesiules on each side. The opesium is subterminal. 

 (After Jullien.) 



Genotype. — Verminaria {Membranipora) oblonga Busk, 1859. Pliocene. 



Genus MICROPORINA Levinsen, 1909. 



1909. Microporina Levinsen, Morphological and Systematic Studies on the Cheilostomatous 

 Bryozoa, p. 162. 



The two opesiulac, wliich, however, are sometimes filled up, appear as simple 

 perforations. Numerous pores. No ovicell, but avicularia with crossbar occur. 



