78 Cincinnati Society of Natural History. 



Genus Helopora, Hall. Gr. helos, a uail; poros. a pore. 



367 Helopora arctipora, Nicholson. L. arctus^ narrow; poros. 



368 dendrina, James, Gr. dendron, a tree. 



369 Meeki, James. 



370 pai'vula, James. L. parvulus.^ very small. 



371 tenuis, James. L. tenuis, slender. 



Family Tuhuliporida\ L. tuhulus, a little tube; poros. 



Genus Ceramopora, Hall. Gr. keramos, a tile; poros. 



372 Ceramopora alternata, James. L. alternatus, alternating. 



373 ? Beani, James. 



374 incrustans, Hall. L. inc7'ustanSy incrusting, 



375 irregularis, James. L. irregularis^ irregular. 



376 Nicholsoni, James. 



377 Ohioensis, James. 



Genus Cyclopora, Prout. Gr. kuldos.^ a circle; poros. 



378 Cyclopora Jamesi, Prout. 



Geuus Callopora, Hall. Gr. ^v^ZZos, beautiful; poros. 



379 Callopora Cincinnatiensis, Ulrich. 



Family Crisiidce. Gr. krisis, a dividing. 



Genus Alecto, Lamouroux. Mj^thological. 



380 Alecto auloporoides, Nicholson, Gr. aulos, a tube; ])oros, eidos. 



381 arachnoidea, Hall. Gr. arachne, a spider's web; eidos. 



382 confusa, Nicholson. L. confusus, disorderly, 



383 frondosa, James. Li.frondosus, like a leaf. 



384 nexilis, James. L. nexilis, wreathed. 



Genus Tlippothoa.^ Lamouroux. Mythological. 



385 Hippothoa inflata. Hall. L. inflates, inflated. 



386 delicatula, James. L. delicatnlus, delicate. 



Family Reteporidce. Gr. rete, a net; /^oros^ a pore. 

 Genus Retejjora, Lamark. 



387 Retepora angulata. Hall. L. atujulatus, having angles. 



SUB-KINGDOM CCELENTERATA. 



Class Polypi. Gy. polus, many; pous, podos, foot. 

 Order Alcyonaria. Mj^thological. 



Family GraptolitidcB. Gr. grapho^l write; lithos, a stone. 

 Genus Graptolithus, Linnjeus. 

 388 Graptolithus gracilis, Hall. L. gracilis, slender. 



