TUNICATA, THALIACEA. Moll. 107 
Corolla . C. 8uhmi , sp. n., Southern Pacific and Indian Ocean, lat. 33° and 
4G° S., 1375-1260 fath. Herdman, Tunicata of the * Challenger,’ 
pp. 186—189, pi. xxv. 
Clavelinidjs. 
Analytical table of the three known genera by Herdman, l. c. p. 239. 
Clavelina lepadiformis (Mull.), formation of the egg and gemmation ; 
Seeliger, supra. 
Clavelina oblonga , Bermudas, and enormi? , Simon’s Bay (Herdm., 1880), 
fully described ; Herdman, l. c. pp. 245-248, pi. xxxv. figs. 3-10. 
Ectinascidia (Herdm., 1880) crassa, Ki Island, crassa , Banda, and tur- 
binata, Bermudas (Herd., 1880) ; id. 1. c. pp. 239-245, pi. xxxvi. 
Synascidl® (Ascijm composite). 
R. von Drasche, Zool. Anz. 1882, pp. 696 & 697, arranges the Synas- 
cidice as follows : — 
Fam. 1. Botryllidai : Botryllus and Botrylloides. 
2. Perophoridoe : Perophora. 
3. Clavcliniditi : Clavelina and Diazona. 
4. Cliondrostachyidcc : Chondrostachys and Oxycorynia, g. n. 
5. Distomidcc : Distoma[-us'\ and Distaplia. 
6. Polyclinidce : Aplidium (including Fragarium , Morchelliuin , 
Circinalium , Parascidia , Amaroucium , Synoicum , Sul- 
nyum , and Sigillina ) and Polyclinum. 
7. Didemnidce : Didemnum aud Leptoclinum. 
8. Diplosomidce : Biplosoma. 
A. Della Yalle has published several papers concerning the com- 
pound Ascidiai of the Mediterranean (titles supra), not seen by the 
Recorder. 
Oxycorynia , g. n. Colony pedunculate, resembling a pine-apple, cloacal 
aperture entire, terminal, branchial aperture external, with eight tenta- 
cles ; the single animals connected together by a very delicate common 
tunica. O./ascicularis , sp. n., Hogoleu, Caroline Islands ; Yon Drasche, 
l. c. pp 162 & 163, and J. R. Micr. Soc. (2) ii. p. 331. [Also in Verh. 
z.-b. Wien, xxxii. pp. i75— 177, pi. xiii., which volume is on the cover 
stated to be published in March, 1883.] 
Distaplia (Della Yalle, 1881) is chiefly distinguished from other Synas- 
cidiai by the presence of a cylindrical diverticle in the cloaca, in which 
the eggs are developed ; in other respects it agrees with the Didemniidai* 
Della Yalle & Lacaze Duthiers, Arch. Z. exper. x. pp. xl.-xlii. 
THALIACEA. 
Doliolidj;. 
C. Grobben has observed that the so-called rosette-shaped organ in 
Doliolum is a proliferous shoot (stolo prolifer), from which a number of 
pieces, which he thinks to be abortive buds, detach themselves spontane- 
ously, and perish afterwards; he comes to the conclusion that in this 
