GIRTY, NEW CARBONIFEROUS F088ILS 199 



bend gradually outward, meeting the surface either somewhat obliquely or 

 with a very short radial poi-tion. The walls are thin throughout, only slightly 

 thickened toward the surface, the thickenings being continuous, but suggesting 

 the nioniliform structure by their irregular outlines. Mesopores appear to be 

 few (more abundant in a second specimen than in that from which this de- 

 scription is dra\^ii). Acanthopores nearly absent, but better developed in the 

 second specimen just mentioned. Tabuhe few and irregularly distributed. 

 Walls with a fairly distinct median line where thickened. Zooecia ~> or 6 in 

 2 mm. 



Stenopora inermis sp. nov. 



Zoarium in I he form of rather large, solid, clumsy branches having a diam- 

 eter of 8 to 12 mm. or more. Surface marked by maculae about 5 mm. apart, 

 often elevated into monticules, a few of which are prominent. Zocecia thin- 

 walled and vertical in the axial region, gradually bent outward so that the 

 mature portion has a radial direction. Mature region not well defined, one 

 fourth of a diameter on a side or less. Mesopores abundant for the genus, 

 groups of them in conjimction with zooecia of unusually large size forming 

 macuhp. Five or occasionally 6 zooecia occur in 2 mm. The walls are often 

 much thickened, but may be fairly thin, strong contrasts occurring close to- 

 gether in the same specimen. Acanthopores are either exceedingly rare or 

 absent altogether. A few doubtful occurrences have been noted in tangential 

 section, but they probably represent the starting point of one of the numerous 

 mesopores. Tabulre appear to be absent in the mesopores. but are abundant 

 in the mature region of the zooecia. usually less than a diameter apart and 

 showing the characteristic median perforation. The thickening of the walls is 

 a marked feature, and it is continuous, not moniliform. though occasional sug- 

 gestions of that structure are presented in sections passing lengthwise through 

 the walls. The median line is strongly marked, in whatever way the walls 

 are cut. 



Amphiporella gen. nov. 



The term Amphiporella is introduced for a type of bryozoan which is 

 related to Stenopora and others of the Batostomellid^e, to which family 

 it obviously belongs, but differs therefrom in growing in large, tortuous, 

 bifoliated fronds. The Batostomellidae have been described as never 

 bifoliate, and the present type is only bifoliated in a sense. Tt has a 

 median immature region from which the cells bend outward in two 

 opposite directions and open on surfaces which are relatively parallel to 

 one another, but it does not consist of two colonies growing back to back, 

 and consequently there is no median plate. This growth can therefore 

 be considered as consisting of branches which are greatly expanded later- 

 ally, rather than as exemplifying the typical bifoliate structure. Acan- 

 thopores are fairly abundant and of very large size in the t^-pe species. 

 Mesopores are also fairly abundant and are apt to be grouped together 

 in maculae associated with large zooecia. Their distribution is irregular. 



