EXPLANATION OF PLATE XXlll. 



Hetekopora parviceli.a ('Gabl) and Horn), p. 1:^7 



1-2. Views of two fragments of zoaria, (x3). 



I'liieciilowii liiiicsoiid: I'liiccntuii'ii, iJi-i). 



RETELEa ovalis Gabb and Horn P- 3^8 



3. View of a fragment ()f a znarumi, natural size. 



4. View of a eellulifcrrjus snrface, niueli enlarged. ( Botli lig- 



ures after Gabli and Tlorn. ) 

 J'iiiirciiloicii liinrsaiiJ. 



FlustkEi.LA ? c.\PiSTk.\T.\ Galjb ,ind I l(M-n p. 3-9 



5. View c>f a fragment nf a zo.arium, mneh enlarged. 



6. View of tile basal e.xpansjon, mueb enlarged, deseribed as 



Mcinhranipora ab"rliz\i b\- Gabl) and Horn. (Both fig- 

 ures after Gabb and Ibini). 



/ "niCCU lii^i'lt h !llCSi!!ul. 



OnychocEi.i.a digit.\t,\ ( Alortou ) p. 330 



7-10. Views of four fragments cif ze.aria. (x2). 



riiiCi'iilii-cCii Iniicsiiud : I 'iiu'Ciitni^'ii , {/5^). 



BiFLUSTRA torta Galib and Horn p. 331 



11-12, Views of two fragments (.if znaria, 1x3). 



J 'uii'ciitui^'ii liincsuiid : I 'nicciilt'wii . (ij-/). 



Bii-I.USTRA ijisjUNCTA Galib and Horn p. 333 



13. View of tlie celltiliferous snrface of a zoarium niueli en- 



barged. (After Gabb and Horn.) 

 Viiiccntm^'u liiiiLSaiid. 



Amphibi.Estrum tiETEroi'Ok.v ( Gabb and florn') p. 333 



14. Surface of zoarium, much enlarged. (After Galib and 



H.a-n.) 



/ nu'Cult'i^'u liiiicsoiid. 



15. Surface i if a zi.iaruini from the f''oceiic, (x20l. (After Mary- 



land (.Tcological Sur\'ey. ) 



16. View of a single zoeciuni more highly magnined. ( .Vfter 



Maryland Geoleigical Sur\e\'. ) 



AIemi'.RANIpora ri.EciA Gabb .and Hnrn p. 334 



17. Surface of zoarium much enlarged. (After G.'ibli and 1 lorn. 1 

 I'iiicciih'Zi'ii liiiu'saiid. 



Membranipora axkui.oiuea Ulricli .and Bassler 11. sp p. 335 



18. Surface of the zo.arium. (X24). 



) ';»rc///.';e;/ Hiiicsaiul: I 'i/.'fi'ii/i'iiv/. (15/). 



92(1 



