160 BTJLLETIN 125, UNITED STATES NATIONAL MUSEUM. 



Genus BRACEBRIDGIA MacGillivray, 1886. 

 (For description, see Bulletin 106, U. S. National Museum, p. 557.) 



BRACKBRIDGIA DEFORMIS Canu and Bassler, 1919. 



Plate 8, figs. 11-16. 



1919. Bracebridgia dejormis Canu and Bassleb, Geology and Paleontology of the West Indies, 

 Bryozoa, Publications of the Carnegie Institution of Washington, no. 291, p. 97, pi. 3, fig. 

 11-16. 



Description. — The zoarium is free, bilamellar, compressed, bifurcated. The 



zooecia are distinct, elongate, separated by a deep furrow, claviform or elliptical; 



the peristomice is oval or elliptical; an oblique avicularium is buried in the peri- 



stomie; the apertura (visible only from the interior) is semilunar; the frontal is 



surrounded by areolar, parietal pores and on the zooecia it bears a large pore which 



does not perforate the wall. 



,, . T.- • . • [hpie = 0.15 mm. „ ■ fX2 = 0.45-0.60 mm. 



Measurements. — reristomice , . ^ ,„ Zooecia , . „_ . „. 



lZpie = 0.12 mm. [ 63 = 0.25-0.30 mm. 



Affinities. — -This species has the exterior aspect of an Adeonellopsis. The 

 large frontal pore, however, is not a perforated area; it is invisible in the interior and 

 its nature is unknown. The few specimens which we have studied were, it is true, 

 rather poorly preserved. The peristomial avicularium is rarely visible at the 

 exterior; it is on the contrary quite constant in the interior. This interior is that of 

 Bracebridgia; it is therefore, indeed, in this genus that it must be classified, but it is a 

 deformed Bracebridgia. The presence of a large frontal pore clearly characterizes 

 this species and clearly differentiates it from the other kno\^Ti species of the same 

 genus. 



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



Cotypes.—C&t. No. 68674, U.S.N.M. 



Genus LAMINOPORA MicheUn, 1842. 



1842. Laminopora Michelin, Iconographie zoophytoolgique. 



The apertura is very elongate; the anter is semielliptical ; the poster bears a 

 long, rounded rimule, two small cardelles separate the two latter parts; the oper- 

 culum bears laterally two lateral denticles articulating on the cardelles. The 

 frontal is a tremocyst with pores not starred. The gonoecia have no special form. 

 Thirteen to fifteen tentacles. 



Genotype. — Laminopora contorta Michelin, 1842. 



Range. — Miocene-Recent. 



Gemellipora ariuscula Calvet, 1907, belongs to this genus. 



LAMINOPORA MIOCENICA, new species. 



Plate 47, fig. 5. 



Description. — The zoarium is bilamellar. The zooecia are distinct, separated 

 by a deep furrow, elongated, oval, much narrowed behind, surrounded by a row of 

 parietal dietellae; the frontal is convex, perforated by large pores; it bears a small 

 elongated avicularium variable in form and in position. The apertura is long and 

 narrow; the rimule is long and spear shaped. 



