84 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



Family CALPENSHD^E Canu and Bassler. 



Genus CALPENSIA Jullien, 1888. 



Calpensia impressa Moll, 1803. 



(Plate 1, Figure 11.) 



Eschara impressa Moll, Die Seerinde aus der Ordnung der Pflanzenthiere, Wien, p. 57, plate 



II, fig. 9, 1803. 



Eschara nobilis Michelin, Iconographie zoophytologie, p. 329, plate 79, fig. 1, 1847. 

 Membranipora calpensis Busk, Catalogue of the Marine Polyozoa in the Collection of the 



British Museum, Cheilostomata, pt. 2, p. 60, plate 104, figs. 5, 6, 1854. 

 Micropora impressa Waters, On the Bryozoa of the Bay of Naples, Am. Mag. Nat. Hist. (5), 



III, p. 1230, 1879. 



Micropora impressa Calvet, Bryozoaires marines des cotes de Coise, Travaux de 1'Institut 



de Zoologie de l'Universit6 de Montpellier, ser. 2, mem. 12, p. 17, 1902. 

 Micropora impressa Canu, Bryozoaires fossils de terraines du Sud-ouest de la France, Bull. 



Soc. Geologique de France (4), X, p. 844, plate 16, fig. 6 (variety), 1910. 

 Micropora impressa Mme. Guerin Guanivet, Contribution a 1'etude des Bryozoaires des 



cotes armoricaines, I, Travaux scientifique du Laboratoire de Concarneau, III, 



p. 5, plate 1, 1911. 



The discovery of this species in America was a great surprise, since 

 it has heretofore been noted only in the Mediterranean area, where its 

 zoaria occur in great abundance, especially on 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 absolutely false, for they have confounded many distinct species; 

 Canu noted five of them in 1911. In spite of its antiquity there are no 

 undoubted references to the species other than those we have given 

 above. 



The zoarium may be incrusting or Eschara-\ike. We have never 

 observed an ovicell; it may have none. The species therefore belongs 

 to a special family with Microporina Levinsen, 1909; Diplodidymia 

 Reuss, Calpensia Jullien, 1888, and Hemiseptella Levinsen, 1909. 



Occurrence. Oligocene (Antigua formation), rare in the Carlisle 

 marl-pit, Antigua, Leeward Islands, T. W. Vaughan, collector, 1914, 

 Locality No. 6873. 



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

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



Habitat. Mediterranean, Gibraltar, Corsica, Tuscany, Naples, 

 Adriatic, ^Egean Sea, Tunis, Algeria, Morocco, Atlantic off Brittany. 



It abounds at a depth of 25 to 30 meters and is very common at the 

 depths of 75 to 100 meters. 



Genus HEMISEPTELLA Levinsen, 1909. 



Hemiseptella grandicella, new species. 



(Plate 5, Figure 11.) 



The following is a description of this species: 



The zoarium incrusts shells. The zocecia are large, elongate, ogival, distinct, 

 separated by a furrow of little depth; the mural rim is narrow, little salient, 

 round, finely granulated; the cryptocyst is large, flat, granulated; the opesium 

 is elongated, elliptical, irregular, and non-symmetrical in the proximal portion. 



