XOUTIL AMKUK'AX EARLY TEUTIARY BRYOZOA. 487 



illumination from below is preferable. The most usual aspects are those of the 

 figures 7-10. 13. Finally the species which is quite vigorous in tlu> lower J nek- 

 son iun (Zr = 0. 70-0.80 mm.) appears to become stunted in the middle and upper 

 Jacksonian (/,:=<>. ">4 0.60 mm.) (fig. 1C). The zooecia are not always distinct 

 (figs. 10. 1C,). 



In the interior (fig. 15) the tubules are well marked by the white circle which 

 surrounds the small pores of the olocyst. Moreover, there is a short lyrula and two 

 small cardelles (fig. !.">). 



This species has been found in man}* localities of the Jacksonian. which fact 

 occasions its name. 



Occ>/fi'c/ic(. Lower Jacksonian (Moodys marl): Jackson. Mississippi (very 

 common ) . 



Middle Jacksonian: Wilmington. Xorth Carolina (common); Baldock, Barn- 

 well County. South Carolina (rare). 



Jacksonian (Zeuglodon zone) : South side of Suck Creek, Clarke County. Mis- 

 sissippi (very rare) ; Shubuta. Mississippi (rare). 



Upper Jacksonian (Ocala limestone) : Alachua, Florida (rare). 

 .v. Cat. Xos. G4147-<-,41.V>, F.S.X.M. 



PORELLA PUNGENS. new species. 



Plate G2, fig. 14. 



Des>'i-!i>ti<i. The zoarinm incrusts oysters. The zooecia are distinct; quite 

 elongated, fusiform, separated by a deep furrow ; the frontal is convex, formed 

 of a tremocyst. with four rows of large scattered pores. The apertura is hidden 

 at the base of the peristomie by the median avicularium; the peristome is very 

 thin and somewhat salient. The ovicell is large, globular, salient, formed of an 

 area with numerous small pores surrounded by a smooth collar. The median 

 avieularium is enormous, very salient: elevated obliquely at 45; it covers in part 

 the apertura and opens on its side. 



f/(/>?=0.08mm. . fZz=0.70-0.80mm. 



Measuremt nfs. 1 eristomice , Zooecia , 



Upe=0.10mm. Us= 0.26-0.30 mm. 



K. This species differs from the inerusting species, such as 

 iti'ii it iilitsa, Porella irregularis, and Porelln coronato, in its enormous and salient 

 median avicularium. 



Its aspect is similar to Pon-Uii jn-ckKonica, of which it is perhaps only the 

 incrusting form. It differs from it nevertheless in its avicularium still more 

 elevated and its salient ovicell. little imbedded in the distal zooecium. It differs 

 from Li')>r(i.J!ii monoctros Eeuss. Is47. and Lf /iri/fia ceratomorpha Reuss. 1847. of 

 the European Miocene, in the presence of tremopores and not of areolae. The 

 zoarium appears to be bristling with sharp points. 



Od-un-i IK-I . Lower Jacksonian (Moodys marl): Jackson, Mississippi (com- 

 mon ) . 



Holotype.-^Cat. Xo. 64143, U.S.X.M. 



