BRACHIOPODA. 71 



Family Cystodictyonidae 



Genus Cystodictya Ulrich 



Cystodictya mineolaensis n. sp. 



Plate 9, figures 1 and 3 



Zoarium a parallel-edged, bifurcating stipe with narrow non-poriferous margins, 

 elliptical in cross-section, 2 to 3 mm. in average width, greatest thickness about .4 mm. 

 Zooecial apertures in 7 or 8 longitudinal, parallel rows, separated by well-developed 

 parallel ridges; averaging 3 zooecia per millimeter lengthwise of the rows; apertures 

 about .2 mm. in their longer diameter and .14 mm. in their shorter, separated longi- 

 tudinally by a space about equal to their own width, not alternating so as to give a 

 zigzag appearance to the interspace but most often opposite. The zoarium varies widely 

 in shape, the branches coming off at infrequent intervals in some specimens and being 

 much closer together in others. 



Remarks — The species is represented by only a few specimens. 



Occurrence — Mineola formation of Montgomery and Warren Counties. 



Genus Coscinium Keyserling 



Coscinium missouriensis n. sp. 

 Plate 9, figure 2 



Zoarium consisting of an explanate frond with oval or circular perforations or 

 fenestrules at somewhat regular distances; length of fenestrules 13^ to 2 mm., width 1 to 

 1J^ mm.; generally distant transversely about 2Yi mm., longitudinally about 3% mm. 

 Cell apertures subcircular, diameter about .12 mm., irregularly spaced, generally 

 separated by one or two apertural diameters. A non-cellular band ranging from J^ 

 mm. to lJ/£ mm. wide borders each fenestrule. The cell apertures are in grooves and 

 low sinuous ridges occupy the intercellular space. The zoarium is J^ mm. thick or 

 less. 



Remarks — This species resembles Coscinium striatum Hall but the pores are smaller 

 and more numerous and the sinuous ridges are much larger and only one occurs between 

 the rows of pores. The surface of our only specimen is somewhat macerated and it is 

 impossible to determine whether the pores originally had denticles. 



Occurrence — Mineola of Montgomery County. 



Class BRACHIOPODA 



Order Neotremata 



Superfamily Discinacea 



Family Discinidae 



Genus Orbiculoidea d'Orbigny 



Orbiculoidea sp. undet. 



One fragmentary brachial valve of an Orbiculoidea from the Snyder Creek shale is 

 in the collections of the University of Missouri. The fragment represents an individual 

 about 25 mm. wide and of only moderate height. Greger 1 , identifies this form as 0. 

 telleri Cleland, but the identification is, at best, doubtful. 



'Am. Jour. Sci., Vol. 49, 4th Series, p. 266. 



