NO. 5 OSBURN : BRYOZOA 43 



Genus HIPPOTREMA Canu and Bassler 1927 

 Hippotrema janthina (Smitt), 1873 



Smitt 1873:63 (Lcpralia edax forma janthina). Osburn 1914:213 

 (Lepralia janthina). Canu and Bassler 1928: 141. 



There is a close general resemblance between this species and the 

 species of Hippoporidra, but the frontal is a tremocyst with numerous 

 pores and its color in life is a deep blue black, vestiges of which pigmenta- 

 tion usually remain even in dead colonies. 



Smitt described it from Florida at 13 fathoms; Osburn listed it for 

 the Tortugas Islands at 6 fathoms, and Canu and Bassler at 130 fathoms 

 north of Cuba. 



Distribution.— ^t^tion^ A13-39, A24-39, A27-39, A30-39, A42-39, 

 At503, At504, At505, At511, At512, and At513. These stations place 

 the locations at Cape la Vela, Colombia ; Cubagua, Margarita, and Aruba 

 Islands at shore to 71 fms. 



Genus SCHIZMOPORA MacGillivray 1888 

 Schizmopora dichotoma (Hincks), 1864 



Smitt 1873:53 (Cellepora avicularis). Osburn 1914:214 (Cellepora). 

 Canu and Bassler 1928: 149. 



A well-known species in the middle North Atlantic. Listed by Smitt 

 from Florida at 9 to 111 fathoms, and by Osburn from the Tortugas 

 Islands at 10 fathoms. Canu and Bassler record it from the Gulf of 

 Mexico west of Florida and from the Pliocene of Bocas Island, Panama. 



Distribution. — Station A42-39, 7 miles N of Margarita Island at 22 

 fms and At528, the Gulf of Venezuela. 



Genus HOLOPORELLA Waters 1909 

 Holoporella albirostris (Smitt), 1873 



Smitt 1873:70 (Discopora albirostris). Osburn 1914:215. Canu and 

 Bassler 1928:142. 



This is usually easily distinguished by the dark pigmentation, through 

 which the tall pointed white suboral prominences stand out distinctly. 

 Smitt described it from Florida at 25 to 35 fathoms; Osburn recorded it 

 from the Tortugas Islands from low water down to 15 fathoms, and 

 Canu and Bassler listed it from the Gulf of Mexico and the Straits of 

 Florida down to 56 fathoms. The species has apparently had a long 

 existence as it has been noted as a fossil as far back as the Oligocene. 



