TITLES. 
Prot. 21 
255. [Ostenfeld, C. H.] & Paulsen, O. Planktonpr0ver fra Nord-Atlan- 
terhavet (c. 58°-60° N. Br.), samlede i 1899 af Dr K. J. V. Steenstrup. 
Medd. Gronland xxvi, pp. 143-207. (Resume in English, pp. 208-210.) 
256. Paehler, F. IJeber die Morphologie, Fortpflanzung und Entwicke- 
lung von Gregarina ovata. Arch. Protistenk. iv, pp. 64-87, pis. 5 & 6. 
Abstract in Bull. Inst. Pasteur ii, p. 853. 
Panisset, — . [See Vall^e & Panisset (347).] 
257. Panse, O. Trypanosoma theileri (?) in Deutsch-Ostafrika. Zeitschr. 
Hyg. xlvi, pp. 376-378, 1 fig. 
Abstract in Centrbl. Bakter. (1) xxxv, Ref. p. 405. 
258. Paulsen, 0. Plankton investigations in the waters round Iceland 
in 1903. Medd. komm. Havundersog. i (i), 48 pp., 12 text-figg., 2 maps. 
. [See also Ostenfeld & Paulsen (255).] 
259. Penard, E. Quelques nouveaux Rhizopodes d’eau douce. Arch. 
Protistenk. iii, pp. 391-422, 1.1 text-figg. 
260. . fitude sur la Chlamydomyxa montana. Op. cit. iv, pp. 296- 
334, 19 text-figg. 
261. . Sur la decharge de la v<isicule contractile dans Y Amoeba 
lerricola. Rev. Suisse Zool. xii, pp. 659-652, 2 text-figg. 
262. . Les H&iozoaires d’eau douce. Genkve (Kundig.) 1904, 341 pp., 
numerous text-figg. 
Review in Bull. Inst. Pasteur ii, p. 428. 
263. Perez, C. Sur une Microsporidie parasite du Carcinus mcenas. C.R. 
Soc. Biol, lvii, pp. 214 & 215. 
Abstract in Bull. Inst. Pasteur ii, p. 810. 
264. . Sur un organisme nouveau, Blastulidium pcedophthorum , 
parasite des embryons de Daphnies. Pr.-verb. Soc. Sci. Bordeaux 
1902-1903, pp. 75 & 76. [Brief account of Zool. Rec. 1903 (294).] 
Abstract in J. R. Micr. Soc. 1904, p. 537. 
265. Peters, A. W. Metabolism and division in Protozoa. P. Amer. Ac. 
xxxix, pp. 441-516. 
266. Petrie, G. F. A note on the occurrence of a Trypanosome in the 
rabbit. Centrbl. Bakter. (1) xxxv, Orig. pp. 484-486. 
Abstract in Bull. Inst. Pasteur ii, p. 250. 
267. *Petschenko, B. Ueber Veranderungen im Bau des Kernes bei 
Paramcecium in naturlichen Existenzbedingungen. Arb. Lab. Warsaw 
xxx, 1903. [In Russian.] 
Abstract in Zool. Zentrlbl. xi, p. 509. 
Philip, W. M. [See Willey, Chalmers & Philip (359).] 
268. Phillips, L. Note on the occurrence of the Leishman-Donovan 
parasite in Arabia and Egypt. J. trop. Medicine vii, pp. 236 & 237. 
269. Plehn, M. Ueber die Drehkrankheit der Salmoniden. [Lentospora 
cerebralis (Hofer) Plehn.] (Vorlaufige Mittheilung.) Arch. Protistenk. 
v, pp. 145-166, pi. 5, 7 text-figg. 
270. Popofsky, A. Die Acantharia der Plankton-Expedition. Theil i. 
Acanthometrea. Ergebn. Plankton-Exped. Humboldt-Stiftung iii, L, 
f. i, 158 pp., 12 pis., 14 text-figg. 
271. Popow, M. Opercularia clepsinis nov. sp. Zool. Anz. xxvii, pp. 340- 
343, 2 text-figg. 
