NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 27 



Affinities. — The primoserial zooecia are small and calcified. The figured speci- 

 men alone has been found. We know no equatorial species with which to compare 

 the present one. 



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



Holotype.— Cut. No. 68415, U.S.N.M. 



CONOPEUM GERMANUM Ulrich and Bassler, 1904. 



Plate 10, fig. 8. 



1904. Membranipora germana Ulrich and Bassler, Bryozoa: Maryland Geological Survey, Miocene, 

 p. 410, pi. Ill, fig. 29. 



The original description is as follows: 



Zoarium fonning a delicate crust upon foreign bodies, the largest seen being less than 1 cm. in 

 diameter. Zooecia shallow, arranged in curved radiating lines in which about 6 occur in 3 mm. ; meas- 

 uring transversely, 11 to 12 of the rows in the same space. Opesia large, more or less elongate-ovate, 

 the length and width usually as 3 is to 2, separated laterally from their neighbors by about half their 

 width, enclosed by a ring-like thickening formed by a furrow separating adjoining zooecia. At some- 

 what irregular intervals, the interzooecial space widens and is occupied by a rounded cell that may 

 have lodged some kind of avicularium. These cells ^•ary greatly in size but are always considerably 

 smaller than the true zooecia. Occasionally the front margin of the zooecium is more elevated than 

 the rest of the circumference. No o\dcells observed. 



The description quoted above gives all the essential features of this species. 

 Occurrence. — Miocene (St. Mary's formation) : Cove Point, Maryland (very 

 rare). Miocene (Choptank formation): Dover Bridge, Maryland (verj^ rare). 

 Holotype.—Csit. No. 68416, U.S.N.M. 



CONOPEUM? NITIDULUM Ulrich and Bassler, 1904. 



Plate 9, fig. 5. 



1904. Membranipora nitidula Ulrich and Bassler, Bryozoa: Maryland Geological Survey, Miocene, 

 p. 412, pi. 112, fig. 1. 



The original description is as follows: 



Zoarium apparently erect, bifoliate. Zooecia oblong, subquadrate, the length twice the width, 

 arranged rather regularly in longitudinal and diagonally intersecting series, rarely four, usually five in 

 three mm. lengthwise, about seven diagonally, and ten or eleven transversely in the same spare. 

 Opesia elongate-elliptical, separated transversely by an obtusely ridge-shaped wall generally equalling 

 about half their width; longitudinal interspaces about twice as great as the transverse, medially ridged 

 with a crescentic ovicellar excavation below (that is, in front of each opesium) and usually a small 

 pore-like depression at each end of the ridge. Very minute spines or granules on inner slope of walls. 



,- ^ r\ • lho = 0.4:5 mm. „ . [i2 = 0.60mm. 



Measurements. — Opesia^, . _„ . „_ Zooecias-, . „_ . „„ 



^ uo = 0.22-0.25 mm. [fe= 0.25-0.30 mm. 



Affinities. — A restudy of the type specimen shows that the original illustration 

 of the species was inverted. At the bottom of each zooecium there is a small flat 

 cryptocyst more or less developed. The interopesial spaces are triangular. The 

 opesium is finely crenulated. 



This species is very close to Conopeum lacroixii Authors, but it difl"ers in its 

 larger micrometric measurements and in the presence of a small pro-xLmal cryp- 

 tocyst. Nevertheless, as the figured example alone has been found, we can not 

 afiBrm the constancy of this latter characteristic. 



Occurence. — Miocene (Choptank formation): Paw^jaw Point, Maryland (rare). 



HoJotype.—C&t. No. 68417, U.S.N.M. 



