Tun. 2 
TUNICATA. 
11. Kowalevsky, A. Sur la metamorphose des larves des Ascidies et 
la formation du Manteau (in Russian). Rev. Sci. Nat. St. Petersb. 
1 anu., No. 9, pp. 378-390. Resume , p. 429. 
12. Lee, A. B. On a little-known Sense-organ in Suljoa. Q. J. Micr. 
Sci. xxxii, pp. 89-97, pi. x. 
13. Matzdorvf, 0. Ueber den Generations-wechsel der Salpen (nach 
O. Seeliger). Naturw. Wochensckr. v, No. 44, p. 438. 
14. Mingazzini, P. Sulla rigenerazione nei Tunicati. Boll. Soc. Nat. 
Napoli (1) v, fasc. 1, pp. 76-79. 
15. Pizon, A. Sur la blastogdnfcse chez les larves d 'Astellium sponyi- 
forme. OR. cxii, pp. 166-168, Jan. 19, 1891, 
16. . Observations sur le bourgeonnement de quelques Ascidies 
Composes. T. c. pp. 399-402, and Rev. Sci. xlvii, No. 9, p. 281. 
17. — — . Sur la blastog6nese chez les Botryllides. Bull. Soc. Philom. 
iii, No. 2, pp. 62-65. 
18. . Sur la formation des colonies chez les Botryllidds. T. c. 
pp. 73-76. 
19. . Sur le d^veloppement du ganglion et du pavilion vibratile 
chez les Botrylles etles Botrylloides. T. c. No. 3, pp. 98-102. 
20. Salensky, W. Beitrage zur Embryonal-entwicklung der Pyrosomen. 
Zool. Jahrb. (Abth. f. Anat.), v, Ht. 1, pp. 1-98, 8 pis. 
21. Swainson, G. New form of Appendicularian “ Haus.” Brit. Ass. 
Rep. 1891, pp. 701 & 702. 
ANATOMY. 
Garstang (2, 3, 4) has some interesting observations on the structure 
of the branchial sac, &c., in various Clavelinidce , Diazona , Ascidia mollis , 
A. depressa , A. mentula , and Archidistoma. He suggests that the 
pharyngo-cloacal slit, which has now been shown to exist in various 
species of Ascidians, may be a special adaptation for the prevention of 
the over-accumulation of faeces in the cloacas of large Ascidians, where 
the stream of water through small stigmata would be insufficient for 
ejection. He also discusses the variations and their nomenclature in 
Ascidia mentula and some other forms. 
Herdman (6) records some variations and abnormalities found in 
specimens of Ascidiella aspersa from the West Coast of Ireland. 
Swainson (21) describes a new form of Appendicularian “Haus,” 
somewhat like a bishop’s mitre. He thinks it serves as a nidamental sac 
for the ova. 
Herdman (9) considers, from a comparison of the structure of the 
branchial sac, &c., of specimens from Naples, from Plymouth, and from 
the Hebrides, that Synlethys hebridicus , Forbes and Goodsir, is the same 
species as Diazona violacea, Savigny. 
