Description of thr Figitues ix Plate I. 



Figures 1 and 2 are reduced from full-sized drawings made by tracing the 

 outline direct from the original objects. Pigs. 4-9 are drawn direct with the 

 camera from the objects themselves. Fig. 3 is constructed from sepai'ate camera 

 drawings of the dorsal, ventral, and lateral surfaces ; the four main canals, 

 indicated by the dotted lines, are filled in from one of Kolliker's figures (ojj. cit. 

 PI. xvii., Fig. 151). The magnifying power is indicated in diameters for each figure. 

 Figs. 1, 3, 4, 5, 7, 8, 9 are from the largest living specimen. 



Alphabetical List of References. 

 a. Rachia. /. Tentacle. 



6. Stalk. 



c. Stem. 



d. Polype. 



e. Zooid. 



g. Caly.x. 



i. Spicule. 



I. Ccenenchym, or fleshy body-substance. 



u. Main canals of rachis. 



Fig. 1. — Lateral view (right side) of the largest specimen, 39 ins. long, dredged 

 living, shown in its supposed natural position with the stalk planted in the 

 mud of the sea bottom, X l-6th. 



Fig. 2. — Similar view of perfect bare stem, 24ins. long X l-3rd. 



Fig. 3. — Transverse section of rachis at its widest part, showing zooids on 

 dorsal surface, and polypes gradually increasing in size from the dorsal towards 

 the ventral surface, leaving the actual ventral surface bare; also the quadrangular 

 stem, and the four main canals of the coenenchym, X 3§. 



Fig. 4. — Portion of dorsal surface of largest living specimen at the widest 

 part of the rachis, about Gins, from top, showing arrangement of zooids and 

 polypes, X 2. 



Fig. 5.— Ventral surface of the same portion, as in Fig. 4, x 2. 



Fig. 6. — Portion of dorsal surface of younger specimen (20 ins. long) at widest 

 r)art of rachis, showing arrangement of zooids and polypes, x 3. 



Fig. 7.— Head of a polype, showing calcareous spicules in the caly.x and its 

 processes, x 10. 



Fig. 8 — .One of the calcareous spicules from the calyx, x 60. 



Fig. 9.— Transverse section of calcareous spicule at the middle of its length 

 X 400. 



