106 Moll. 
MOLLUSCOIDEA. 
Abyssacidia ; Vid. Medd. 1881, p. 270 (in Danish), pp. 284 & 285 (in 
Latin). 
Herdman gives a table of the genera of this family and their mutual 
affinities in Tunicata of the ‘ Challenger,’ p. 185. 
Ascidia (L., restricted) = Phallusia (Sav.), general remarks on the 
structure of the branchial sac and schematic diagram of the whole 
animal ; A. challengeri , sp. n., nearly allied to mentula (Mull.), Kergue- 
len, 10-60 fath., nigra (Sav.), Bermudas, vasculosa and placenta , Kergue- 
len, meridionalis , Buenos Aires, falcigera , Nova Scotia, tenera } Straits of 
Magellan and Buenos Aires, translucida and despecta f Kerguelen, 
cylindracea and pyriformis ) Australia (all Herdm., 1880), fully described 
by Herdman, l. c. pp. 106-220, pis. xxx.-xxxiv. 
Ascidia mamillata (Cuv.), Sorby & Herdman, J. L. S. xvi. p. 529, 
pi. x.'figs. 1-5, Southern Coast of England. 
[Ascidia] Phallusia styeloides , hygomiana , curvata, and longitubis , 
spp. nn., and P. atra (Lesueur) =? nigra (Savigny, nec Herdman), St. 
Croix, St. Thomas, and other islands of the West Indies ; Traustedt, 
Vid. Medd. 1881, pp. 276-284 & 286, pis. iv. figs. 5-12, v. figs. 16-22, 
figures of the whole animals, and particulars of the branchial sac. 
Phallusia mentula (Mull.) and mamillata (Cuv.), note on its parasites ; 
Giesbrecht, MT. z. Stat. Neap. iii. pp. 291-298. 
Pachychlcena (Herdm., 1880, as subg.) elevated to generic rank, P. 
oblonga and obesa (Herdm., 1880), Bass Strait, and gigantea (Herdm., 
1880), Simon’s Bay, Cape of Good Hope; Herdman, Tunicata of the 
‘ Challenger,’ pp. 221-227, pis. xxviii. & xxix. 
Hypobythius (Moseley, 1876), generic character. II. calycodes (Moseley), 
North Pacific, 2900 fath., and moseleyi i sp. n., South Atlantic, 600 fath. ; 
id. 1. c. pp. 227-233, pi. xxxvii. 
Ciona (Sav., Elem.), generic character discussed. C. Jlemingi (Herdm., 
1880), Canary Islands, 78 fatli., and C. savignii , sp. n., Japan, 8-50 fath. ; 
id. 1. c. pp. 233-237, pis. xxxiv. figs. 7-10, xxxv. figs. 1 & 2. 
Ciona intestinalis (L.), lives only about five months; Weissmann, Ueber 
die Dauer des Lebens, 1882, p. 81. 
Abyssascidia wyvillii (Herdm., 1880), South of Australia, 2600 fath., 
fully described ; Herdman, l. c. pp. 193-196, pi. xxvii. 
Corella (Aid. &. Hanc.), analytical table of the 6 known species, and 
C. japonica (Herdm., 1880), fully described; id. 1. c. pp. 189-193, 
pi. xxvi. 
Corella minuta , sp. n., St. Thomas, West Indies, and eumyota , sp. n., 
Bahia and Valparaiso; Traustedt, Vid. Medd. 1881, pp. 271-274, in Latin, 
p. 285, pi. iv. figs. 1-3, and pi. v. figs. 13 & 14. 
Rhodosoma pyxis , sp. n., = ? seminudum (Heller), St. Thomas and St. 
Croix, West Indies ; id. 1. c. pp. 274 & 285, pis. iv. fig. 4, and v. fig. 15. 
Corynascidia , g. n. Shape elongated, pyriform, pedunculated ; aper- 
ture not lobed ; test gelatinous or membranous. Branchial sac ex- 
tremely delicate, internal longitudinal bars present, but not provided 
with papillae, interstigmatic vessels coiled spirally. Dorsal lamina in the 
form of languets. Tentacles simple, filiform. Viscera on dorsal edge of 
branchial sac, running autero-posteriorly. Deep-sea representative of 
