92 Moll, 
MOLLU^COIDA. 
Mediterraneau aud Adriatic. M. scrotum (Chiaje, as Ascidia) and claudi- 
cans (Savigny, as Cynthia)^ from the same seas ; id. 1. c. pp. 247 & 248, 
pi. ii. figs 6-8. M. affiniSy New Holland, exasperatus, Jamaica, varie- 
yatas, West Indies, distans, Jamaica and New South Wales, oligophyllus^ 
Cape of Good Hope, spp. nu., id. SB. Ak. Wien, Ixxvii. Abth. i. pp. 98-101, 
pi. i. fig. 6, pi. iii. figs. 19-21, and pl. v. fig. 27. 
Stycla (Sav.) is distinct from Cynthia by having only four branchial 
folds, simple, unbranched tentacles, and the want of a distinct liver ; S. 
canopoides and gyrosa, spp. nn., Mediterranean and Adriatic ; id. Denk. 
Ak. Wien, xxxvii. pp. 253-259, pl. iii. figs. 7-12, pl. iv. figs. 1-8, and pl. vi. 
figs. 1-5. S. 'pupa. Cape of Good Hope, areolatay Ceylon, humilis, New 
Zealand, spp. nn., id. SB. Ak. Wien, Ixxvii. Abth. i. pp. 107 & 108, pl. i. 
fig. 7, and pl. ii. figs. 13 & 14. 
Polycarpa, g. n , characterized by numerous roundish or oblong bag- 
like genital glands scattered in the peribrauchial cavity. P. varians, 
gracilis, sabulosa, spp. nn., tuberosa (Macq., as Cynthia) and glomerata 
(Alder), Mediterranean and Adriatic ; id. Denk. Ak. Wien, xxxvii. 
pp. 259-265, pl. V. figs, 1-9. P. nigricans, Mauritius, mollis, locality un- 
known, tumida, Jamaica, obscura, South Australia and Samoan Islands, 
stimpsoni, Sydney, pedunculata, Bass Straits, nebulosa and data, Bowen, 
Australia, spp. nu. ; id. SB. Ak. Wien, Ixxvii. Abth. i. pp. 102-107, 
pl. ii. fig. 15, pl. iv. figs. 23-25, pl. v. fig. 28, pl. vi. figs. 29-31. 
Rhodosoma seminudum, sp. n., id. SB. Ak. Wien, Ixxvii. Abth. i. p. 91, 
pl. i. fig. 5, Jamaica. 
Gymnocystis (Giard) ampulloides (Beneden), id. Denk. Ak. Wien, 
xxxvii. pp. 265-267, pl. yi. figs. 4-13, also in the Mediterranean Sea. 
Molgula occulta (Kupffer), impura, and appendiculata, spp. nn., Mediter- 
ranean and Adriatic, id. 1. c. pp. 267-271, pl. vi. figs. 14 & 15, pl. vii. 
figs. 1-12. 
Boltenia gibbosa, sp. n., Bass Straits, id. SB. Ak. Wien, Ixxvii. Abth. 
i. p. 109, pl. vi. fig. 32. 
SYNASCIDIiE. 
Didemnum sp. and Leptoclinum sp., from the Arctic Sea, Heller, Denk. 
Ak. Wien, xxxv. [1875] p. 44, pl. v. figs. 9 & 10. 
Salpa’. 
W. Salensky has observed in Salpa democratica that the testicles of 
Salpa are developed from a peculiar heap of cells, consisting of several 
strata, and situated near the rectum, somewhat to the right side, and not 
from the elasoblast, which is well developed next to it in the same chained 
individual. He discusses the principal differences between the theories 
of Brooks and Todaro [cf. Zool. Rec. xii. p. 210, and xiii. Moll. p. 65], 
and concludes, from personal observation, that the solitary individuals of 
Salpa have no organ of generation, and are the asexual form of the 
alternating generation, aud that the eggs contained within the compound 
Salpai are to be ascribed to these, and not to the solitary parent ; aud 
that, therefore, the compound Salpai being the sexual form, the typical 
