NO. 5 OSBURN : BRYOZOA 45 



Genus TREMATOOEGIA Osburn 

 Trematooecia protecta Osburn, 1940 



Osburn 1940:459. 



This genus was established to include the Lepralia turrita of Smitt 

 (1873:65), as the genotype, and the present species both of which have 

 a large pore or depression on the top of the ooecium, together with other 

 characters which separate it from Holoporella. In the present collection 

 there are six small, young colonies which are without ovicells, but which 

 agree in measurements and in the presence of 4 to 6 tall spinous processes 

 around the aperture, as well as in the glistening white texture. 



Distribution.— ^tztlons A42-39, At503, At504, At505, and At512. 

 These stations place the locations at Cape la Vela, Colombia; Aruba, 

 Margarita, and Cubagua Islands at 2 to 22 fms. 



Trematooecia pertusa (Smitt), 1873 



Smitt 1873:72 (Discopora pertusa). Waters 1885:305 (fCellepora 

 pertusa), and 1909:165 (? Holoporella pertusa). 



This unusual species has apparently not been observed since it was 

 described by Smitt from Pourtales' dredgings off the coast of Florida 

 (exact locality not stated by Smitt). Both of Waters' references appear 

 to be in doubt: the first is fossil in the Aldinga formation of Australia 

 and is entirely without avicularia; the second, from the Sudanese Red 

 Sea, has a shorter operculum of different form and bears spatulate avicu- 

 laria. 



Smitt's figures, especially plate 12, figs. 240, 241, are excellent for 

 the young stage and his description, as far as it goes, is correct. 



The zoaria form rounded caps or nodules on the projecting points of 

 corallines and similar surfaces and, as far as observed, the colonies are 

 always small. The zooecia are perfectly erect, a millimeter or more in 

 height, and there is no orientation even at the growing edge of the colony. 

 The frontal or exposed ends of the zooecia are irregularly hexagonal, 

 slightly ventricose, and separated by thin raised lines. The frontal is a 

 tremocyst with large pores, often only a few in addition to the areolar 

 pores. The primary aperture is rounded distally, somewhat straighter oh 

 the sides back to the heavy cardelles, the proximal border a broad arc 

 as wide as the rest of the aperture, and the operculum presents almost the 

 exact picture illustrated for T. protecta Osburn (1940; plate 8, fig. 71). 

 The peristome is moderately thin, raised, and usually bears 4 small 



