156 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 7i 



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

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



Order CYCLOSTOMATA Busk 



The poverty of the Cyclostomatous fauna in the recent seas is 

 more apparent than real. The great difficulty of determination 

 causes authors to neglect the difficult, incomplete, or very rare speci- 

 mens. In reality the species are rather abundant but they are 

 rarely represented by a sufficient number of specimens for detailed 

 study. 



For the Gulf of Mexico region, Smitt cites 1 1 species and Osburn, 

 1914, 2 only, of which 1 is new for the area. We describe or cite 

 15 species in this work, 11 of which are new. The total is now 28 

 species. This number is not complete, for we have neglected seven 

 species, unfortunately represented by unique specimens or those not 

 in a condition for study. 



From the point of view of the paleontologist, a knowledge of 

 the cyclostomatous bryozoa is absolutely indespensable and the 

 neglect of the study of the recent species is much to be regretted. 



Family CRISIIDAE Johnston, 1847 



Genus CRISIA Lamouroux, 1816 



CRISIA DENTICULATA Lamarck, 1812 



Plate 30, Figure 4 



1838. Crisia denticulata Milne Edwards, M6moires sur les Crisies. 

 Annales des Sciences Naturelles Zoologie, ser. 2, vol. 9, p. 9, pi. 7, 

 fig. 1. 



1873. Crisia eburnea Smitt, Kongl. Svenska Vetenskaps-Akademiens 

 Handlingar, vol. 10, p. 4, pi. 1, figs. 1 to 4 (not 5). 



1891. Crisia denticulata Harmer, On the British species of Crisia. Quart- 

 erly Journal Microscopical Science, vol. 32, p. 129, pi. 12, figs. 1-3. 

 (Bibliography.) 



1914. Crisia denticulata Osburn, Bryozoa of the Tortugas Islands. Publi- 

 cation Carnegie Institution No. 1S2, p. 185. 



The segments collected are few in number but their determination 

 does not appear doubtful. The restrictions made by Osburn are 

 well founded. The joints are black. 



Occurrence. — Albatross Station D. 2317, north of Cuba; 24° 25' 

 45" N.; 81° 46' 45" W.; 45 fms.; coral. 

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

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

 coral. 

 Florida, 11-97 meters (Smitt); Tortugas, 16-24 

 meters (Osburn). 



