336 iME^OZOIC FLORAS OV I'NITED STATES. 



The forin occurs from (ilcurosc southw aril to the Colorado in great quantities 

 and ranges throughout tlie Colorado River section. 



It could be douhtt'ully id'erred to the genus Aiaucarites, whicli it more closely 

 resenitiles than any other, although this is for the botanists to determine. 



Oil pi. i, figs. 1. la-(l, he figures one of the globular objects and a 

 series of markings designated imljricate scales of cone, seeds, scars, etc. 



The same year Prof. F. W. Cragin published in the T'ourth Annual 

 Report of the Geological Survey of Texas" a description of this same 

 form, making it a new genus of Bryozoa, which he names Porocystis, 

 and describes on p. 165, giving to the Texan form the specific name 

 prutiifornns. It is figured on pi. xxiv, figs. 2-6. In the discussion he 

 refers to Mr. Hill's paper on the Occurrence of Goniolina, and says that 

 "specimens submitted to the late Dr. Ferdinand Roemer, and which, 

 like most of those that have thus far been collected, were imperfect and 

 decepti^'e in surface-characters, were returned marked, ' f Parkeria sp. 

 nov.'" He also speaks of having "discovered the polyzoan nature of 

 this so-called Goniolina." 



Two years later a German paleontologist, Hermann Rauff, having 

 received from Professor von Koenen five specimens of the fossil organism, 

 collected at Bull Creek Bluffs, on the Colorado River 6 miles west of 

 Austin, Tex., made them the subject of a very thorough investigation, 

 the results of which he pul)lished.'' This is by far the most exhaustive 

 study that has been made of this organism. His figures are very clear, 

 and he magnified portions of the surface ten diameters, showing the 

 exact nature of the peculiar pits with which it is covered. He finds 

 these to consist of polygonal (hexagonal, pentagonal, etc., very irregular 

 and unequal sided) areas separated by raised lines and crossed by straight, 

 depressed lines or cracks that divide them into four quadrants. Within 

 each of these little frames, but rarely in the center, there is a minute 

 boss or button nearly circular in section, and' rising as high as the walls 

 or higher. By radial sections he was able to prove that these latter 

 represent the summits of little tubes, now filled with mineral substances. 

 These tubes penetrate the sphere, but could not be traced far. They 

 appear, however, not to go to the center, but to take an oblique direction 



"C'ontrihution to the iiivcrtobiate paleontology of the Texas Cretaceous, by F. W. Cragin: Fourth Ann. 

 Rep. Gcol. Surv, Te.xas, Austin, .June, ISiCJ, pp. 139-246, pi. x.xiv-xlvi. 



'' I'eber I'orocy.stis pniniforinis Cragin ( = * Arauearites Wardi Hill ) aus der unteren Kreide in Texa.s, von 

 He.nnann Rauff; X. Jahrb. f. Min., etc., 189.5, Bd. I, pp. 1-l.i, pi. i. 



