ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
183 
themselves. The main-dwellers are reduced in size, and less strongly 
coloured, in consequence of the want of light ; a steady rapid current 
has caused a lengthening of the shell, and the shells themselves arc 
polished, brilliant, and uniform. 
Check-List of Slugs.* * * § — Prof. T. D. A. Cockerell has prepared a 
check-list of the slugs, to which Mr. W. E. Collings has added an 
appendix and notes. Six hundred and twenty-eight species are enume- 
rated. The difficulty of a worker who knows only British forms is that 
they are, for the most part, very distinct from one another, whereas in 
Southern Europe and elsewhere there are many forms closely allied to 
the British. 
Molluscoida. 
a. Tunicata. 
Eyes and Subneural Gland of Salpa.j — We gave such a full notice 
of Mr. M. M. Metcalfs preliminary paper, :£ that we must content our- 
selves with calling attention to the publication of the paper in full. In 
three appendices he brings the work up to date by critical references to 
recently published memoirs. 
Salpse of Berlin Museum.§ — Dr. C. Apstein has made a revision of 
the collection of Salpse at Berlin, and finds that there are twelve species 
and two varieties, represented by 849 specimens. Salpa bicaudata Q. 
and G. is found to be equal to S. scutigera confcederata form bicaudata. 
S. quadrata Herdm. = the solitary form of the same. S. democratica 
mucronata var. jlagellifera Traust. = S. flagellifera Traust. S. asp era 
Cham. = S. runcinata fusiformis var. eciiinata (Herdm.) ; and S. antarc- 
tica Meyen = S. africana maxima prol. sol. This last species has been 
taken in the Pacific. 
Tunicata collected by Dr. Sander. |j — Herren M. Traustedt and 
W. Weltner found three new species among the six Ascidiacea collected 
by Dr. Sander during the voyage of the German war-ship ‘ Prinz 
Adalbert * ; these are Cynthia Sanderi (Nagasaki and Yokohama), Styela 
longitubis (Yokohama), and Phallusia princeps (Cape Town) Five 
Thaliacea were collected. The compound forms have not been worked 
out. 
£. Bryozoa. 
Contributions to our Knowledge of Polyzoa.1T — Dr. H. Prouho 
continues his investigation of marine Polyzoa. -He begins with a few 
notes on terminology. The term Bryozoite may be conveniently applied 
to any member of the colony, either to the single oozoite or to any one 
of the numerous blastozoites. He will continue to use the terms zoecium, 
cystid, and polypide, though he regards the Bryozoite as an indivisible 
unity; the zoecium or cystid is the protective external skeleton, tho 
* London, 8vo, 1893, 58 pp. Reprint from Conchologist, ii. pp. 168-76 and 
185-232. 
f Baltimore, 1894, 4to, 65 pp., 11 pis. Reprinted from part 4 of W. K. Brook’s 
Memoir on the Genus Salpa. J This Journal, 1892, pp. 466 and 7. 
§ Arch. f. Naturg., lx. (1894) pp. 41-54 (1 pi.). 
|| Tom. cit., pp. 10-14 (1 pi.). 
U Arch. Zool. Exper,, x. (1892) pp. 557-656 (8 pis.). 
