BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 101 



Plate 19 



Figures 1-6. Beisselina mortoni, new species (p. 76). 



1, Fragments of zoaria. Natural size. 



2, Branch with a single avieularium on the proximal lip of the 

 peristomice, forming the mucron. The ascopore is small. 



3, Specimen slightly worn. The proximal avieularium is in 

 its place, but there is no avicularian mucron. 



4, Portion of a branch with a large avieularium. 



5, Branch somewhat worn. The peristomes bear on their 

 proximal lip 2 or 3 avicularia, replacing the avicularian 

 mucron. 



6, Worn specimen. 



7-13. Beisselina labiata Gabb and Horn, 1862 (p. 73). 



7, Fragments. Natural size. 



8, A colony (X 3) showing the base grasping another bryozoan. 



9, Surface of a branch in which the zooecia have very large 

 ascopores. 



10, A bifurcated branch with small ascopores. The frontal of 

 each zooecium is covered by three small avicularia or by a 

 single very large one. 



11, Edge of a branch. The ascopores are very large. 



12, Longitudinal section in a branch having large frontal 

 avicularia. 



13, Transverse sections. (a=apertura; as=ascopore; av= 

 small frontal avicularia ; Av=large frontal avicularia ; pe= 

 peristomice (external aperture); pi=peristomie ; z= 

 zooecium.) 



Plate 20 



Figures 1-3. Perigrastrella exserta Gabb and Horn, 1862 (p. 80). 



1, Surface of the encrusting zoarium with some zooecia so 

 worn as to show the dietellae. 



2, Zooecia illustrating the fringed peristome and the recumbent 

 ovicell. 



3, A specimen in which the distal dietellae are visible on the 

 broken zooecia and the areolar pores are apparent. 



4-7. Monoporella (?) vinceni 'oivnen sis Ulrich and Bassler, 1907 (p. 39). 



4, A small colony with opesiules visible. From near Black- 

 woodstown, N.J. 



5, Portion of the encrusting zoarium with one complete and 

 one broken ovicell. From near Blackwoodstown, N.J. 



6, Surface of zoarium with lamellar expansions marking the 

 place of ancient ovicells or those not fully formed. 



7, A typical expansion with ovicells and opesiular indenta- 

 tions visible. From near Blackwoodstown, N.J. 



8. Diacanthopora marginata Gabb and Horn, 1862 (p. 69). 



The original illustration of this encrusting species, which has 

 not been rediscovered. From Mullica Hill, N.J. 



