BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 95 



G, A specimen with regular gemmation. The smooth, carinated, 



hyperstomial ovicell is well shown. 

 7, A zoarium with ancestrula. An interzooecial avicularium is 



regenerated by an ordinary zooecium. 



Plate 6 



Figures 1,2. Grassimargmat ella nematoporoides Ulrica and Bassler, 1907 (p. 28). 

 Fragments of the narrow subeylindrieal zoarium, exhibiting the 

 oval zooecia with spinous mural rim, convex gymnocyst, and 

 beaklike interzooecial avicularium. 

 3,4. Euritina torta Gabb and Horn, 1862 (p. 33). 



3, A narrow example of the free bilamellar zoarium. The deep 

 cryptocyst and fusiform onychocellaria are well developed. 



4, Portion of a wide frond with both ordinary and ovicelled 

 zooecia. 



5,6. Oallopora noxontownensis, new species (p. 30). 



Two portions of the type, an encrusting specimen from Noxon- 

 town Millpond, Del. The oval, elongated zooecia separated 

 by a deep furrow and bearing four hollow spines are espe- 

 cially characteristic. 

 7-10. Callopora jersey ensis Ulrich and Bassler, 1907 (p. 29). 



7, Fragment of the bilamellar zoarium with young zooecia. It 

 shows the calcification of the avicularia and some regenerated 

 zooecia. 



8, Another example with some young zooecia. The avicularia 

 are irregularly arranged. 



9, An ovicelled specimen ; there are four avicularia around each 

 aperture. 



10, Cross section showing that the basal lamella is simple and 

 that the two lamellae are inseparable. 



Plate 7 



Figure 1. Floridina subscutata, new species (p. 34). 



Portion of the encrusting zoarium. The small zooecia with tri- 

 foliate opesium and the onychocellarium with elliptical aper- 

 ture are shown. From Noxontown Millpond, Del. 

 2-8. Amphiblestrum (?) abortiwm Gabb and Horn, 1S62 (p. 30). 



2, Pentagonal claviform fragment, showing the longitudinal series 

 of vibracula. 



3, Quadriserial fragmeat with the vibracula and the structure of 

 the ovicells exhibited. 



4, Pentagonal specimens with a series of cells viewed from the 

 front. 



5, A worn specimen. 



6, Dichotomously branched fragment with ovicelled zooecia corre- 

 sponding to the description of Gabb and Horn for var. capis- 

 tratum. 



7, Encrusting ovicelled specimen with regenerated zooecia and dif- 

 ferent kinds of kenozooecia. 



8, A zoarium encrusting Coseinopleura digitata and giving rise to 

 erect branches. X 6. 



