18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 : art. 27 



Chaunoyraptus scandens, new species 



FiGUEES 4, 5. Opposite sides of auotlier hydrozoan, with larger liydrothecae. 

 X4. 

 6. Camera drawing of type to show character of hydrocauli and 

 hydrothecae. X4. 



Plate 3 



Marrella splendens Walcott 



Figure 1. Camera drawing of freshly molted specimen in New York State 

 Museum, showing hypostoma (u), fine parallel sculpture lines of 

 crustacean carapace, bifurcation of legs (c), and thin epidermis 

 film of pygidium {p). X4. 

 '2. Unretouched photograph of same specimen, showing the lateral com- 

 pression of pygidium. X4. 



Cliaunograptus scandens, new species 



3. Photo of counterpart of type specimen, slightly retouched. X4. 



Plate 4 



Chaunograpttis scandens, new species 



FiGUEE 1. Another slab retaining mostly hydrocauli and a few hydrothecae. 

 X4. 



Mania ualcotti, new species 



2. Photo of holotype, not retouched. X2. 



3. Drawing made with Lapworth-Parkes microscope to bring out details 



of structure. X4. 



Plate 5 



FiGUKE 1. Restoration of Mania loalcotti, new species. 



Plate 6 



Man-ella splendens Walcott 



FiQTJEB 1. Cranidium of original of Walcott's Plate 26, Figure 1. X9. 



2. View of obliquely compressed specimen, showing glabella and pygi- 



dium. X3. 



3. Dorsal view of specimen showing glabella, frontal sections of facial 



sutures, gills on cephalic appendages (left upper side), and axial 

 lobe of thorax. The axial segments appear to continue into the 

 pleura on the right side, beyond which traces of the feet are 

 seen. X3. 



Plate 7 



Marrella splendens Walcott 



FiGXJRE 1. Ventral view of specimen. X3. 



2. Dorsal view showing shell glands in position. X3. 



3. Frontal portion of glabella with shell glands. X9. Portion of 



Walcott's Plate 25, Figure 4. 



4. Frontal margin of glabella, with shell glands. Portion of Walcott's 



Plate 25, Figure 5. The frontal lobe of the glabella is forced beyond 

 the white transversal doublure of the cephalon and embraces the 

 circular shell glands. X9. 



U. S. GOVERNMENT PRINTIN6 OFFICE: 1931 



