rr.ATE "l. 



Fics. 1-7. Euiitinn Iccta, new spcries (p. i!5Sl. 



1. Surfiu-e of tile freo l)il;imell;ir zoMriiiiii, X 20. Tlie iiorin;il Zdoeeia with lalcr.il grodves 



are seen in the upper tliinl of the photo^rapli. Imt the zooechi of the supplementary 

 layer in the lower two-thirds, ajipear quite different. 



2. Portion of a zoariuni, X 2(i, with two nvicelled znnciia and several avie\daria. 



The avienlaria of the prinidserial zooeeia are munded and have a marked distal 

 convexity. 



3. Tangential thin section, X 2t». sliowing olocystal elements of eryptoeyst and nuiral 



rim. 



4. Tangential thin seetion, X KHX illustrating uliK-ystal structure of the bottom of the 



zooecium. 



5. Interior of the zooecial frontal, X 20, showing the structure of the .avicularium 



and the thickening of the lower opesial border. 

 6, 7. Two interiors. X 20. illustrating the similarity of shape of both primoserial and 

 ordinary zooecia and the alisence of any trace of the grooves of the cryptoeyst. 

 Midwayau ( Cla.vton- limestone) : Mabelvale. iie.ir Little Kock, Arkansas. 

 Cat. No. (j3S07, U.S.X.M. 

 FitiS. S-10. Meinhyaniporelln jilniiHht. new spei-iis i p. 2sfii. 



8. Zooecia of the free bilauiellar zoarium. X 20. e.vhibiting tlie flat costnles and the 



wide intervening slits. 



9. Another zoariuni, X 20, with slightly larger zooecia. The deep furi'ow separating 



the zooecia is quite evident. 

 Midwayan (Clayton limestone) : JIabelvale. near Little Uock. Arkansas. 

 Cat. No. 03808, T'.S.N.SI. 

 10. Interior of the zooecia, X 20. 



Midwayan (Cla.vton limestone) : Luverne. Crenshaw County, Alabama. 

 Cat. No. 03800. I'.S.N.M. 

 Fin. 11. ('rihriliiia Uitirnstiildtii. new species (p. 202). 

 I'ortiou of the incrusting zoariuni, X 20. 

 Midwayan (Cla.vton limestone) : Brundidge. Alabama. 

 Cat. No. (:i3810. I'.S.N.M. 

 Fio.s. 12-14. CrihriUiKi nri iicuxn, new species (p. 291). 



12. Surface of the incrusting zoarium, X 20, with the lacunae little visible. 



13. Another zoarium, X 20, in which the lacunae are well developed. 

 Midwa.van (Clayton limestone) : Mabelvale. near Little Uork. Arkansas. 



Cat. No. 03811. F.S.X.M. 



14. A zoarium. X 20. witii the lumen line shown. 



Midwayan (.Cla.vton limestonel : 1 mile west of Fort (laines, Georgia. 

 Cat. No. 03812, U.S.N.JI. 

 Figs. I.j-17. Crihiiliiiu rtitlihii'tnc. new species (p. 203 1. 



15,1(3. Portion of two zoaria, X 20. The differences in the lacunae are due to fos.siliz:ition. 

 17. A zoarium. X 20, with several zooecia preserving the costules quite clearly, 

 Midwayan (Clayton limestone) : Mabelvale, ne.-ir Little Kock, Arkansas. 

 Cat. No, 63813, F.S.N.M. 

 Figs. 18-20. Grphijrotes saillnii-'^. new siiecies (p. 3(jl). 



18.10. Two fragments of the creeiiing zoarium. X 2('. The prondiu>nt peristome .and the 

 large avicul.aria are characteristic. 

 20. A specimen. X 20. with the spiramen developed on most of tlie zooecia. 

 Jlidwa.van (.Clayton limestone) : Luverne. Crenshaw County. Alabama. 

 Cat. No. 63814. I'.S.N.M. 

 Fio. 21. Piielliiia. species undetermined (p. 2r)."i). 



.Surface of the only zoarium noted. X 20. 



Midwayan (Clayton limestone): Luverne. Cicush.-iw County, .\lab.-ima. 

 Cat. No. (i3SL-,. I'.S.N.M. 

 6 



