XORTH AMERICAN EARLY TERTIARY BRYOZOA. 143 



of Smitt. As the ovicoll was not figured, we can not compare it with the species 

 of Waters. 



Manzoni in 1875 1 thought also that he had found D'Orbigny's species in the 

 Plaisancian sands of Castrocaro, in Italy. His figure is very similar to that of 

 Smitt, 1872, although it will be difficult to get an exact idea of the ovicell from it. 

 In 1893, Neviani, 2 revising the Manzoni collection, stated that Membranipora 

 imgularis, M. catenular/a, and M. lincata of this author form one and the same 

 species, all appearing to have interzooecial avicularia. Under these conditions it is 

 evident that the Manzoni species is different from that of D'Orbigny and also 

 of Smitt. The paleontologist who rediscovers it will hare to rename it. 



Habitat. Pourtales has dredged this species off Florida to a depth of 97 

 meters. Osburn has noted it off the Tortugas Islands from 13 to 15 meters. 



It creeps over shells and Nullipores. 



Alderina imbettis Hincks. 1860, is a very rare species. It inhabits the deep 

 waters off England (Hinck. 1880), Denmark (Levinsen, 1894). and Norway (Nor- 

 man, 1879). 



ALDERINA? NODULOSA, new species. 

 Plate 9, fig. 10. 



Description. The zoarium is free, unilamellar, creeping over algae. The, 

 zooecia are elongated, distinct, oval, bearing inferiorly one to two projecting nod- 

 ules: the mural rim is thin at the top, much enlarged below, curved, delicately 

 decorated with radially arranged granules. The opesium is oval, finely crenulated. 

 The ovicell is hyperstomial and never closed by the operculum, salient, globular, 

 elongated. The distal septula may be replaced by three smaller septulae. The 

 first pair of lateral septulae is very large ; the two other pairs of lateral septulae 

 are smaller and may each be replaced by two smaller ones. This arrangement of 

 the septulae is visible exteriorly. 



. Ao=0.32-0.35 mm. 

 Measurements. Opesia 7 _ OA nnK 



I lo= 0.20-0.25 mm. 



. 2=0.45 (2 nodules)-0.62 mm. (1 nodule). 

 ia 72=0.30-0.35 mm. 



Affinities. This elegant species is quite remarkable on account of its plainly 

 visible septular arrangement. A large septula is sometimes, without any apparent 

 reason, replaced by two or three smaller ones closely arranged. The long zooecium 

 with a single inferior nodule appears to be primoserial. 



On account of its nodules and its external aspect, this species somewhat 

 resembles Alderina solidula Hincks, 1860, in which, however, the septular arrange- 

 ment is binary. Its arrangement of the septulae in threes would suggest its position 

 in the genus Cauloramphus Norman, 1903, but the ovicells of the species of this 

 genus are either unknown or endozooecial. The septular arrangement and the 



1 1875. Manzoni, I. Briozol del Pliocene antico di Castrocaro, Bologna, p. 10. pi. 1, fig. 5. 

 - 1893. Neviani, Seconda contrihuzione alia conoscenza del Briozoi fossili italiani, Bollettino della 

 Societa geologica italiana, vol. 13, p. 9. 



