AET. 14 FOSSIL AST) EECENT BEYOZOA CANU AND BASSLER 99 



Structure. — The zoarium is formed of dichotomous, cylindrical 

 branches borne by a slightly expanded discoidal base. It is entirely 

 covered over by a thin ectocyst, allowing all the tuberosities and the 

 tremopores of the skeleton to be visible. The latter are small and 

 numerous. The zooecia are indistinct except at the extremity of the 

 branches. The ovicell is saHent, globular, almost entirely covered by 

 tremopores; a median cicatrix permits the inferior olocyst to be seen. 



In longitudinal section the zoarial walls are very thick and perfo- 

 rated by very numerous tubular tremopores. The transverse section 

 shows six zooecia; the peristome is ornamented 

 by two longitudinal lines of granules. 



The operculum is large, oval, with the two 

 small lateral denticles characteristic of the 

 genus; its decoration is rather variable. 



Affinities. — The zoarium of Gemellipora 

 punctata Canu and Bassler, 1923, is identical fig.i6.-gemelupoea glabra 

 but the present species differs from it in its smitt, 1873. a, b. two as- 



n 1 J. J. J i PECTS OF THE OPERCULUM, 



smaller and more scattered apertures. y^ ^ 



Biology. — Our specimens were in reproduc- 

 tion. It is an equatorial species and from shallow water. 



Occurrence. — Albatross Station D. 2405, Gulf of Mexico; 28° 45' 

 00'' N.; 85° 02' 00" W.; 30fms.; gray sand, broken 

 coral. 

 Albatross Station D. 2639, Straits of Florida; 25° 04' 



50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 

 Fowey Light, 15 miles south of Miami, Fla.; 40 fms. 

 Florida, 90 meters (Smitt). Atlantic: Bahia, 16-48 

 meters; John Adams Bank (Busk). 

 Plesioiy pes. —Cat. No. 7501, 7502, U.S.N.M. 



GEMELLIPORA (?) LIMBATA Smitt, 1873 



1873. Gemelli'pora limbaia Smitt, Floridan Bryozoa. Kongl. Svenska Veten- 

 skaps-Akademieus Handlingar, vol. 11, p. 40, pi. 11, figs. 212-214. 



We have found some zooecia of this remarkable monoserial species. 

 They were dead and we have not been able to make a close study of 

 them. We have preserved Smitt's generic name, although the spe- 

 cies appears to us to belong to the genus Lagenipora. 



The diameter of the apertura is 0.09 mm. The frontal is smooth. 

 or areolated. 



Biology. — The zoarium encrusts Cellepores (Smitt), shells, or nulli- 

 pores. It is a species of great depths. 



Occurrence. — Albatross Station D. 2152, 23/^ miles northwest of 

 Habana Light; 387 fms.; coral. 

 Albatross Station D. 2320, north of Cuba; 23° 10' 



39" N.; 82° 18' 48" W.; 130 fms.; fine coral. 

 Florida, 763 meters (Smitt) . 



