94 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



We are not certain that Busk's species is identical with that of Smitt, 

 as the former author represents it, but evidently the characters of the 

 Antigua fossil, although poorly preserved, are in harmony with Smitt's 

 figures. The measurements of this fossil are : Apertura : ha = 0. 16 mm. , 

 la = 0.20 mm.; zooecia; Zz = 0.90 mm., lz = 0.70 mm. 



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

 Leeward Islands. 



Habitat. — Shetland Islands, waters off Florida (185 meters). 



Genus RHAMPHOSTOMELLA Lorenz, 1886. 



Rhamphostomella laticella, new species. 

 (Plate 5, Figure 12.) 



The figured specimen is the only one found; it is unfortunately 

 incomplete and worn and does not permit a detailed description. It 

 incrusts a shell; the areolar costules are rare or little visible. The oral 

 avicularium is quite large, oblique, the point directed towards the 

 bottom. 



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

 (very rare). 



Genus RHYNCHOZOON Hincks, 1891. 



Rhynchozoon vaughani, new species. 

 (Plate 2, Figure 23; Plate 4, Figures 1, 2.) 



The following is a description of this species: 



The zoarium is unilamellar. The zocecia are large, distinct, hexagonal or 

 claviform; the frontal is smooth, convex, surrounded by a line of small scat- 

 tered areolar pores. The apertura is large, suborbicular, with a wide proximal 

 rimule; the peristomie is deep and widened; the very irregular peristome 

 bears some large tubercles; the false rimule is compressed between two large 

 tuberosities, one of which bears an oral avicularium transversely arranged. 



Measurements.— Apertura: ha = (t), Za = 0.20 mm.; zocecia: Lz = 0.60 mm., 

 Jz=0.50mm. 



Affinities.— This species differs from Rhynchozoon solidum Osburn, 

 1914, which it much resembles, in its much larger micrometric measure- 

 ments and in the absence of the small frontal avicularium. 



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

 (Bluff 3), Santo Domingo (very rare). 



Family ADEONID^E Jullien, 1903. 



Genus ADEONA (Lamouroux, 1816) Levinsen, 1909. 



Adeona porosa, new species. 



(Plate 6, Figures 22, 23.) 



The following is a description of this species: 



The zoarium is free, bilamellar. The zocecia are little distinct, very elongate, 

 separated by a hardly visible, salient thread; the frontal is porous, little 



