BRYOZOA. 485 



tions, but their ends rarely if ever project into the zooecial cav- 

 ity. The vesicles resting upon the median laminae are elongated 

 in the direction of growth, those resting upon them are smaller, 

 angular, comparatively few, and often failing to completely 

 isolate the zooecia. 



This species is to be compared with M. eximia, but the thinner 

 zoarium, much more closely arranged zooecia and smaller maculae 

 distinguish the two species without much trouble. Thin sections 

 furnish additional differences. An undescribed associated species 

 is not so readily separated, though differing in several impor- 

 tant particulars. Its zoarium is two or three times as thick, 

 the zooecia separated by somewhat wider interspaces, and all 

 tlit- diaphragms strongly recurved. 



Position and locality: Chester group. Chester, 111. Sloan's 

 Valley. Ky. 



MEEKOPORA CLAUSA Ulrich. 



PI. LXXVI, Rg. 6 and PI. LXXVH, fig. 7-7b. 



Fistulipora? claitsa Ulrich, 1884. Jour. Cin. Soc. Nat. Hist. Vol. 7, p. 47. 

 PL 3, fig. 4, 4b. 



This species of which a full description was given in the refer- 

 ence above cited, was there referred to Fistulipora with an (?) 

 added. The weighty points in which it differs from Fistulipora 

 then pointed to a generic separation which I was unwilling to 

 make without first finding similar species. This has been done 

 and the genus Meekopora established for their reception. M. 

 i-lnu^a is related to M. eximia, the type of the genus, but differs 

 too conspicuously in its habit of growth and other characters 

 to admit of confusing them. 



Position and locality: Chester group. The types are from 

 Sloan's Valley and Grayson Co., Ky., but I have seen speci- 

 mens from Chester. Dl. 



MEEKOPORA? APERTA Ulrich. 



PL LXXVI, fig. 1, la. 



Zoarium consisting of small compressed branches, several cm. 

 in height, about three to five mm. in width by one mm. in 



