PLATE XXIII. 



All drawn by Mr. E. S. Morse, from Specimens collected by Dr. Packard, 



AND PRESERVED IN AlCOHOL. 



Fig. 318. Ascidia callosa. 



Fig. 319. Botryllus Schlosseri. 



Fig. 320. Cynthia pyriforinis. 



Fig. 321. The same enlarged. 



Fig. 322. Cynthia placenta. 



Fig. 323. Olanduia fibrosa. 



Fig. 324. Cynthia condylomata. 



Fig. 325. Boltenia clavata. 



Fig. 326. Cynthia echinata. 



