nOTIlVIJ.TD/r. DTDEMNIDyT?. 
181 
Section 2. QLOMEiiATiE, 
Tribe Polyclinidse : ApUdium (including Amaroucnmi) and PolycUmim. 
Section 3. Reticulata. 
Tribe 1. DidemnidfB : Pidemnum, Eucceliunij and Leptodinum. 
Tribe 2. Diplosomidae : Pseudodidemnum and Astellium, 
He also discusses tlie development of the compound Asddta observed at 
EoscofF : Arch. Z. exp^r. i. pp. 661-704. History of the knowledge of those 
animals: id. ibid. pp. 601-613. 
C. W. Peach preserves compound Ascidians in Canada balsam, after dry- 
ing them on cotton or linen rag and blotting-paper. Specimens so treated 
26 years ago remained beautifully preserved. Q. J. Micr. Soc. (2) xii. 
p. 162. 
Potryllus. A. Giard, 1. c. pp. 619-631, describes the following species, all 
observed at RoscofF : — 
a. From the zone of Fuens vesicuhsus and serratus: B. violaccus (M.-E.), 
p. 621, pi. 29. figs. 9-12, and B. calendula, sp. n.,p. 023, pi. 27. figs. 1 & 2. 
b. Zone of Zoster a and Ilimanthalia loreai R. sc7i/ossen(Sav.), with several 
varieties, p. 626, pi. 30. figs. 10-12; smaragdus (M.-E.), p. 626, pi. 29. figs. 2-6; 
pruinosus, sp. n., p. 627, pi. 27. figs. 6 & 7, and pi. 29. fig. 1. 
c. Zone of Laminaria : aurilineatm, sp. n., p. 029, pi. 30. figs. 6-7 ; morio, 
sp. n., p. 629, pi. 30. figs. 8 & 9 ; marionis, sp. n., p. 630, pi. 30. figs. 8 & 9 ; and 
rubigo, sp. n., p. 631, pi. 30. figs. 3 & 4. 
Botrylloides rotifer and ruber (M.-E.), and prostratus, clavelina, and in- 
signis, spp. nn. : id. ibid. pp. 631-633, pi. 27. figs. 3 & 10, and pi. 28. fig. 6, 
RoscofF. Some particulars concerning the development of B. ruber observed 
at Arendal in Norway, by C. KuplFer, Arch. mikr. Anat. viii. 
POLYCLINIDiE. 
Aplidium zostericola, sp. n., Giard, Arch. Z. exp^r. i. p. 636, pi. 26. fig. 6, 
Roscoff. 
A. (subg. Amauroucium Amaurceciwni]) densum, sp. n., id. ibid. p. 637, 
pi. 26, fig. 1, and pi. 28. fig. 6, RoscofF. 
A. (subg. n. PVagarium') elegans, sp. n., id. ibid. p. 638, pi. 28. figs. 4 & 6, 
RoscofF. 
A. (subg. n. Circinalimn) cotxcrescens, sp. n., id. ibid, p. 639, pi, 25. figs. 2-6, 
and pi. 23. fig. 35, RoscofF. 
A. (subg. n. Morchelliuni), type A. argus (M.-E.), id, ibid. p. 640. 
Polyclinum (Sav.). Several subgenera characterized : id. ibid. p. 642. P. 
sabulosum, sp. n., id. ibid. p. 643, pi. 23. fig. 4, and pi. 26. fig. 2, RoscofF. 
Didemnida. 
Didemnum niveum, cereum, and sargassicola, spp. nn., id, ibid. pp. 648 & 649, 
pi. 28. figs. 1, 2 and /3-f, pi. 22. figs. 1-16, Roscoff*. 
Eucoelium para^iticum, sp. n., id. ibid. p. 660, pi. 22. figs. 4-14, RoscofF. 
Leptodinum perforatum and lucasi, spp. nn., id. ibid. pp. 652 & 653, pi, 26. 
figs. 3 & 4, pi. 22. fig. 12, Roscoff. 
