FOSSIL BRYOZOA FROM THE WEST INDIES. 93 



Affinities. The only specimen found has been figured. The species 

 is absolutely characterized by its elliptical avicularium placed inferiorly, 

 a character which does not exist in the other species of the genus. We 

 have observed a rather rare case of regeneration of a zocecium by an 

 avicularium (zr). 



Occurrence. Lower Miocene (Bowden horizon), Cercado de Mao 

 (Bluff 3), Santo Domingo. 



Genus HIPPOPORINA Neviani, 1895. 



Hippoporina lata Smitt, 1862. 



(Plate 1, Figure 14.) 



Gemellipora lata Smitt, Floridan Bryozoa, pt. I, Kongl. Svenska Vetenskaps-Akademiens 

 Handlinger, X, No. 11, p. 36, plate 7, fig. 157, 1872. 



This Recent species was described from specimens from the Floridan 

 waters and the species itself is confined to this region. A very mediocre 

 fossil specimen of doubtful determination has been found in the strata 

 of Antigua. 



Occurrence. Oligocene (Antigua formation), Rifle Butts, Antigua, 

 Leeward Islands, T. W. Vaughan, collector, 1914, loc. No. 6854. 



Family SMITTINID^ Levinsen, 1909. 



Genus SMITTINA Norman, 1903. 



Smittina (?) brevis, new species. 



(Plate 2, Figure 22.) 



The following is a description of this species : 



The zoarium is bilamellar, with fronds somewhat compressed. The zooecia 

 are little distinct, elongate, elliptical; the frontal is convex and very short, 

 and it bears below a large salient avicularium with rounded beak. The 

 apertura is elliptical and deep. The ovicell is globular, little salient, orna- 

 mented by a fragile circular area; it opens into the peristomie. 



Affinities. This species is quite unique and difficult to classify. We 

 have put it in Smittina because the ovicell opens into the peristomie 

 formed by the thickening of the frontal walls; but it does not really 

 belong to this genus, because it has no lyrula nor oral avicularium and 

 because the apertura is not semilunar. 



Occurrence. Lower Miocene (Bowden horizon), Cercado de Mao, 

 Santo Domingo. 



Genus PORELLA Gray, 1848. 

 Porella bella Busk, 1860. 

 (Plate 1, Figure 15.) 



Lepralia bella Busk, Quarterly Journal Microscopical Science, VIII, plate xxvn, figs. 



2, 3, 1860. 

 Escharella landsborovi Smitt, Floridan Bryozoa, pt. II, Kongl. Seven. Vet. Akad. Hand., XI, 



No. 3, p. 60, plate x, figs. 201, 202, 1873. 

 Smittia bella Hincks, British Marine Polyzoa, p. 352, plate 42, figs. 9, 10, 1880. 



