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 pyriformis. 



Fig. 321. The same enlarged. 



Fig. 322. Cynthia placenta. 



Fig. 323. Olandula fibrosa. 



Fig. 324. Cynthia condylomata. 



Fig. 325. Boltenia clavata. 



Fig. 326. Cynthia echinata. 



