NORTH AMERICAN LATER TERTIARY AND 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. 11, 
fig. 9. 
1847. Eschara nobilis 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 l’lnstitut 
de Zoologie de l’Universite de Montpellier, ser. 2, mem. 12, p. 17. 
1910. Micropora impressa Canu, Bryozoairs fossiles de terrains du Sud. Ouest de la France, Bulletin 
Socidtd G6ologique de France, ser. 4, vol. 10, p. 844, pi. 16, fig. 6 (variety). 
1911. Micropora impressa Mme.Guerin-Ganivet, Contribution a l’etude des Bryozoaires des cotes 
Armoricaines, I, Travaux scientifique du Laboratoire de Concarneau, vol. 3, p. 5, pi. 1 
1919. Calpensia impressa Canu and Bassler, Geology 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 opesiulae, which, however, are sometimes filled up, appear as simple 
perforations. Numerous pores. No ovicell, but avicularia with crossbar occur. 
