98 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



Plate 12 



Figure 1. Rhiniopora parviro strata, new species (p. 54). 



Encrusting ovicelled specimen, illustrating the very small avicu- 

 laria. From Noxontown Millpond, Del. 

 2,3. Rhiniopora tuoulosa, new species (p. 53). 



2, Ordinary zooecia of the encrusting zoarium. 



3, Zoarium with ovicelled zooecia. The operculum closes the 

 hyperstomial ovicell and the apertura. 



4. Kelestoma simplex, new species (p. 55). 



Encrusting ovicelled specimen exhibiting the furrows separating 

 the zooecia, the very small ovicell, and the small oral avicu- 

 laria. 

 5,6. Anornithopora (?) fragilis, new species (p. 60). 



5, Portion of the encrusting colony where some zooecia have pre- 

 served their costules. 



6, Ovicelled portion of another colony. The operculum closes the 

 ovicell. One of the ovicells is partly mutilated. 



7. Nannopora (?) minimora, new species (p. 52). 



View of the encrusting zoarium, showing resemblances to Criori- 

 laria radiata. 



8. Pliophloea elegans, new species (p. 50). 



Ovicelled portion of an encrusting zoarium. The vibracula are 

 very small. From Noxontown Millpond, Del. 



Plate 13 



Figures 1,2. Tricephalopora prolifera Gabb and Horn, 1862 (p. 56). 



1, Surface of the encrusting zoarium, showing ovicelled zooecia, 

 the central elliptical costulated area, and the pseudospiramen. 



2, A much calcined specimen. The costulated area is reduced, 

 and the costules are little distinct. The nature of the ovicell 

 and the structure of the oral arch are visible. 



3,4. Tricephalopora acutirostris, new species (p. 57). 



Two views of the free unilamellar zoarium with ovicelled 

 zooecia. The straight avicularia, arrangement of costules, 

 pseudospiramen, and hyperstomial ovicell are illustrated. 

 5. Tricephalopora incrassata, new species (p. 58). 



Ovicelled zooecia of the encrusting zoarium much calcified. The 

 epicalcification almost entirely surrounds the frontal. 

 6,7. Stichocados campositus Lang, 1916 (p. 62). 



6, Zooecia with incomplete frontal and without peripores (after 

 Lang, 1922). X 27. 



7, The unilamellar zoarium with adult zooecia well preserved 

 and with frontal peripores. From near Blackwoodstown, 

 N.J. 



8. Stichocados mucronatus, new species (p. 64). 



Portion of the encrusting type specimen, with ovicelled zooecia 

 and showing the ancestrula. 



9. Eesperopora occidentalis Lang, 1916 (p. 61). 



Zooecia of the unilamellar zoarium (after Lang, 1922). X 27. 

 From near Blackwoodstown, N.J. 



