42 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



,, , r^ ■ (Ao = 0.30-0.32 mm. „ . fZ2 = 0.40mm. 



Measurements. — Opesia , „ „. „„. Zooecia , . „. 



^ [Zo = 0.20-0.24 mm. ((2= 0.30 mm. 



Affinities. — -Our ovicelled specimen was not in a condition for photography, 

 but it is well preserved and our generic determination is exact. We have observed 

 some calcified and perforated zooecia. 



In the number of spines this species much resembles Membranipora echinata 

 D'Orbigny, 1839. It differs from it in its oval opesia and in the presence of the 

 interzooecial aviculariura. It belongs to the group of Callopora tenuirostris. 



Occurrence. — Pleistocene: Santa Barbara, California (rare). 



Holotype.—C&t. No. 68453, U.S.N.M. 



CALLOPORA GUERNEI Jallien, 1903. 



Plate 45, figs. 3, 4. 



1903. Membranipora guernei Julhen, Bryozoaires provenant des Campagnes de V Eirondelle (1886- 

 1888), Re3ultat8 des Campagnes scientifiques du Prince de Monaco, fasc. 23, p. 40, pi. 5, 

 fig. 3. 



,, J r\ ■ Iho = 0.33 ram.. „ . fi2 = 0.45-0.50 mm. 



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



^ (to = 0.20-0.25 mm. [te = 0.30-0.38 mm. 



Affinities.— The micrometric measurements noted on Jullien's figures are a 

 little larger than ours; but as these are drawings and not photographs an error is 

 always possible. Our specimens have the regularly oval zooecia shown in the 

 figures of the French zoologist. Moreover, the interzooecial avicularia are identical 

 with those described by Calvet in the same publication, "ils sont de forme ovoide 

 a mandibule arrondie, et disposes soit obliquement, soit transversalement par rap- 

 port au grand axe de zoo6cies." 



Occurrence. — Pleistocene: Mount Hope, Panama Canal Zone (verj- rare). 



Habitat. — Gulf of Gascony at 135 meters. 



Plesiotypes.— Cut. No. 6S454, U.S.N.M. 



CALLOPORA PILUM Jullien, 1903. 



Plate 45, fig. 5. 



1907. Membranipora filum Calvet, Bryozoaires, Expedition Scientifique du Travailleur et du Talis- 

 man, p. 386 (bibliography). 



The ovicell of this species has not yet been described exactly, but Calvet writes 

 that there are many ovicells which have the peculiarity of being operculated; that 

 they are rather salient, have a semicircular basal contour and are provided with a 

 semicircular orifice placed below the zooecial orifice. We believe that there is, 

 therefore, no doubt in assignmg the species to the genus Callopora, although the 

 figure of Smitt, 1872, suggested an endozooecial ovicell. Our specimens are encrust- 

 ing a coral. 



Occurrence.— Pleistocene, Mount Hope, Panama Canal Zone (rare). 



Habitat.— Northeast of Morocco (714 meters). Cape Verde Islands (110-180 

 meters), Azores (80-318 meters), Corse and Florida (21-97 meters). 



Plesiotype.—G&t. No. 68455, U.S.N.M. 



