Io8 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XIV. 



Fig. I. Ascorhiza occidentalis Fewkes. A single stalk containing basal 

 portion {b.) and capitulum {cap.). Lower portion of latter consti- 

 tutes the region for the formation of the muscle plates {m. b.) of 

 the stalk {stk.). 



Fig. 2. Represents the basal portion (1^.) enlarged, together with the first 

 three segments of the stalk {stk.). The muscle plates, or mycecia 

 {fny.), crowded irregularly into the stalk. 



Fig. 3. Part of the transitional region {trans, re.) in the lower portion of 

 a capitulum, with a small portion of the zooecial part {z. re.) 

 above, and of the stalk {stk.) below. The zooecial region repre- 

 sents the adult zooecia with the intercalated polypide buds {p. b.). 

 Directly beneath, muscle plate buds {m. b.) and polypide buds 

 {p. b.) are seen developing side by side. Below this, the muscle 

 plates (m. p.) are recognized by the growth of the muscle fibers, 

 while lower still, at the distal end of the stalk {stk.), the adult 

 muscle plates {m. p.) are more regularly arranged. 



Fig. 4. Portion of the cross-section of a stalk, showing the central lumen (/.) 

 and four myoecia {my.), one of which contains a greenish rounded 

 body {g. b.) 



Fig. 5. Portion of the cross-section of the same stalk, showing lumen (/.) 

 also the overlapping of the myoecia, t7ty^. disappearing, while my'^. 

 is coming in to take its place. 



Fig. 6. Sketch of a polypide to show the relation of the organs. 



Fig. 7. Sketch of a tentacle sheath showing its ctenostomatous characters. 



Figs. 8 and 9. Alcyonidium pedunculatum, sp. nov. A complete colony, 

 showing the disc {d.) by which it is attached, the peduncle {ped.), 

 and the large ascidian-like capitulum {cap.). 



