ri.ATi': 24 



Fi<;s l-(!. Mcmhrriitlocriinii diiiilr.r. new siiccics I p. 12in. 



1. The i„-n,sth.R zoarhun, X 20, sl.owin,- z.„„vi. wilh dislinrl unu-al .-..us an,l ,n,ni- 



.. i..!;'ti!;!; nf the UH-n,stin, .oarinn,, X 2<i. .xhihitn. ...oo.-ia at the hot.on, with thin 

 and (listiu.-t mural rims ami tlie others thielv and continent. 

 Upper JacUsonian (Oeala limestone): near llainhridse, (ieorgui. 

 f'-it No 63889, U.S.N.M. 

 3. Snrface'of zooecla. X 20, exhibiting die.ellae on the zooe-ia with thi.-U nn.ral runs 



and ovicells. 



4 Another zonrinm. X 20, with thick walls :,nd ovicells develol»^'l 



rpi>er JacUsonian ( Ocala limestone) : Chipola River, east of Mananna. Florula. 

 Cat. No, 63S0O, U.S.N.M. 



5 A siieeimen. X 20, with the surface altered chemican,v. 



" Upper .Tacksonian (Ocala limest.me) : HainhridL-e. (ieorgia. 



Cat. No. 63801, U.S.N.M. . . 



C An example. X 20. showing thin mural rim and well marked avicnlarm. 

 Lower Jacksonian (Moodys marl): Jackson. Mississippi. 

 Cat. No. 63892, U.S.N.M. 

 Figs 7-12. I'riii>om><rnn taiilUhi Cann and Bassler, I'.tlT ( P. 12r>i. 

 7 Four fragments of the bilamellar zoarinm. natural i?ize. 

 8. surface r.f fragntent. X 20. showing the rectangnlar in.listinct zooecn., wtth hroad, 



tlat mural rim and the avicuhiri.i. . 



9 Portion of another zoarinm, X 20, >vith ovicells developed. The opentttg of the large 



distal septula is visible at the base of the sn|xn-ior zooecium. 

 10. The am-2d surface, X 20, exhibiting the dietellae arranged entirely around each 



zooecium, 

 11 T-iu-ential thin section, X 20, exhibiting the numerous dietellae. 

 12: ian^ential thin section, X 100, passing throu.gh the mural run and exhibiting the 

 radlMll.v arranged olocystal elements. 

 Middle Jacksonian (Castle Hayne limestone: Wilnnngton, North CatoUn.i. 

 Cat. No. 62.577. U.S.N.M. 

 Firs IM-T; Onniiiiirllii ('inxKiiiiainiiiiito llincks, ISSO (p. 131). 



13 The incrusting zoarium, X 20. well preserved and exhibiting total regeneration of 

 the zooeeia manifested by the double rim. Near the base of the figure is a zooecium 

 showing triple regeneration. 

 Middle .Ja.Ksoniau (Castle Hayne limestone): Wilmington North ( a,..l.n.i. 



Cat. No. 63803, T\S,N.M , , , , 



14. The usual aspect of the species. X 20. wlu-n avicnlaria are little ,leveloped. 

 ir. The ancestnila (") and surrounding zooecia. X 20. 



■ Upper Jacksonian (Ocala limestone) : miles north of Ocala. 1- londa. 

 Cat. No 63804, T^S.X.M. 



25 

 55ia9g_20— Pull. 106 i 



