FOSSIL BRYOZOA FROM THE WEST INDIES. 95 



convex, surrounded by areolar, parietal pores, of which one is larger than the 

 others. The ascopore is large, orbicular, median. The apertura and peris- 

 tomice are semilunar, with the proximal border somewhat concave. The 

 gonoecia have two very large symmetrical, areolar pores and irregular, oral 

 gibbosities. The avicularian zocecia have their opesia arranged on the lower 

 part of a pyriform area, calcified and deep. 



Measurements. Apertura: /ia = 0.12 mm., Za = 0.12 mm.; zocecia: 1/2 = 0.60 

 mm., fc = 0.30 mm. 



Affinities. As we possess only the figured fragment, the study of 

 this species is necessarily incomplete. The species is very peculiar 

 one, for there is no other one provided with a porous frontal and oral 

 gibbosities at the goncecia. 



It is to be noted that this genus has disappeared from the waters of 

 the Gulf of Mexico. In the family Adeonidse, only the genus Adeonel- 

 lopsis has survived. 



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

 (Bluff 3), Santo Domingo. 



Adeona heckeli Reuss, 1847. 



Cellepora heckeli Reuss, Die fossilen Polyparien des Wiener Tertiar-beckens, Haidinger'a 



naturwissenschaftliche Abhandlungen, II, p. 85, plate 10, fig. 10, 1847. 



Lepralia violacea Johnston, A History of the British Zoophytes, p. 325, plate 57, fig. 9, 1849. 

 Multiporina umbilicata Gabb and Horn, Monograph of the Fossil Polyzoa of the Secondary 



and Tertiary Formations of North America, Journal Academy of Natural Sciences 



of Philadelphia (2), V, p. 145, plate 20, fig. 27, 1862. 



Microporella violacea Hincks, History of the British Marine Polyzoa, p. 216, 1880. 

 Adeona violacea Osborn, The Bryozoa of the Tortugas Islands, Florida Carnegie Inst. Wash. 



Pub. No. 182, p. 199, 1914. 



Of this species we have found only a single specimen in the Bowden 

 marl which is moderately well preserved. 



This fossil, rather abundant in the European Miocene and Pliocene, 

 is, on the contrary, quite rare in America. 



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



Geological distribution. European Miocene and Pliocene; Miocene 

 of North Carolina and Virginia ; Pliocene of Shell Creek, Florida. 



Habitat. Atlantic and Mediterranean. In Florida this species was 

 dredged at a depth of 56 to 97 meters. Osburn collected it at a depth 

 of 8 to 29 meters in the region of the Tortugas. Finally Verrill noted it 

 from the Bermudas. 



Family HIPPOPODINID^: Levinsen, 1909. 



Genus METRARABDOTOS Canu, 1914. 



Metrarabdotos colligatum, new species. 



(Plate 4, Figures 3 to 12.) 



The following is a description of this species : 



The zoarium is free, bilamellar, attached to algae by a small, expanded base 

 and bent upward like a crank; the fronds are large, bifurcated, but narrow. 

 The zocecia are distinct, separated by a salient thread, long and narrow; the 



