GEOGRAPHICAL DISTRIBUTION, SYSTEMATIC. Tltll. 7 
Traustedt (30) describes 3 species of Doliolum and 13 species of 
Salpa (2 n. spp.) as having been obtained in the Atlantic by the Plankton 
Expedition. He also gives tables of the known distribution of the species 
of Doliolum and Salpa in the great oceans. Traustedt also (31) gives 
records of 20 species of Simple Ascidians found in Danish seas during the 
“ Haughs” expedition. 
Kia3r(15) records 34 species of Simple Ascidians from Norway, of which 
6 are new species. He gives tables of the geographical and bathymetrical 
distribution. The Tunicata of the White Sea are given in a paper by 
Jacobsoiin. 
Brooks (5) gives some information in regard to the geographical dis- 
tribution of some of the species of Salpa, 
IV.— SYSTEMATIC. 
IIerdman (11) discusses the synonymy and nomenclature of many of 
the British and North European Simple Ascidians, and redoscribes 
and figures some of the older species of Forbes, Alder, and Hancock. 
He also gives an account of Styela rustica , and distinguishes this 
species from S. monoceros , Moller. 
Traustedt (30) considers that Salpa musculosa, Herdman. and S. punc- 
tata, Forskahl, are the solitary and chain forms respectively of the 
same species. Ho gives usoful synoptical schemes of the species of 
Doliolum and Salpa. 
Ritter (22) describes a Perophora, which seems to form a remarkable 
transition f rom “ Social ” (Clavellinid) to Compound Ascidians, as 
the ascidiozooids are sometimes free and at other times completely 
imbedded in a common test. 
ASCIDIACEA. 
ASCIDEE COMPOSITE. 
Fam. Diazonibje. 
Diazona hyalina , n. sp., Heiden, (8) Zool. Jahrb. Syst. vii, p. 342. 
Fam. Distomid^. 
Cystodytes injlatus, n. sp., Heiden, (8) t. c. p. 344. C. poly orchis, n. sp., id. 
t. c. p. 346. C. irregularis , n. sp., id. t. c. p, 347. 
Distomus tridentatus, n. sp., Heiden, (8) t. c. p. 347. 
Distaplia intermedia , n. sp., Heiden, (8) t. c. p. 348. 
1893. [vol. xxx.] 
c 12 
