TITLES. 
Gen. Sub. 29 
486. Maas, 0. Ueber Reifung und Befruchtung bei Spongien. Anat. 
Anz. xvi, pp. 290-298, 12 figg. 
487. McGregor, J. H. The spermatogenesis of Amphiuma. J. Morphol. 
xii (Supplement), pp. 57-104, 2 pis. 
488. MTntosh, W. C. The resources of the sea ; as shown in scientific 
experiments to test the effects of trawling and of the closure of 
certain areas off the Scottish shores. 8vo, London, xvi+ 248, Frontis¬ 
piece, 16 pis., 8 figg., 32 tables. 
489. -. A recent research on epitokous forms of Annelids. Nat. Sci. 
xiv, pp. 375-384. 
Cf. Caullery & Mesnil (113). 
490. -. George James Allman. Nat. Sci. xiv, pp. 74-76. 
491. Mackintosh, R. From Comte to Benjamin Kidd. The appeal to 
biology or evolution for human guidance. 8vo, London, xxii + 287 pp. 
Much biological criticism. 
492. MacMunn, C. A. On the gastric gland of Mollusca and Decapod 
Crustacea: its structure and functions. P. R. Soc. London lxiv, 
pp. 436-439. 
493. -. The pigments of Aplysia punctata. J. Physiol, xxiv, pp. 1-10, 
2 pis. 
494. *Majewski, E. Worterbuch der zoologischen und botanischen 
polnischen Namen. [Polish.] T. ii (1898) M-Z, 4to, Warsaw, pp. 467- 
888 . 
495. *Makaroff, N. N. Differenzierung der inneren Organe in neuge- 
bildeten liinteren Segmenten des Korpers der Oligochaeten. [ Tubifex 
bonneti Clap, and Lumbriculus variegatus Grube.] [Russian.] Tagbl. 
Ges. Fr. Nat. Moscau, Zool. Abth. t. ii, pp. 1-20, 18 figg. 
496. Mann, G. What is life? Tr. Oxford Club, N.S. No. 6, pp. 99-101. 
497. Marchal, P. Comparaison entre le developpement des Hymenopteres 
parasites a developpement polyembryonnaire et ceux a developpement 
monoembryonnaire. C.R, Soc. Biol, i, pp. 711-713. 
498. Marchesini, R. Sulla fina struttura delle fibre nervose a mielina. 
Bull. Soc. Rom. viii, pp. 17-24, 1 pi. 
Mark, E. L. [See Hertwig, O. (342).] 
499. Marinesco, G. Recherches sur la biologie de la cellule nerveuse. 
Arch. Physiol. 1899, pp. 89-111, 1 pi. 
500. Marsh, O. C. [the late]. The value of type specimens and importance 
of their preservation. P. Congr. Zool. iv, pp. 158-162. 
500a. Marshall, A. Milnes [the late] & Hurst, C. H. [the late]. A 
Junior course of practical zoology. Fifth edition, revised by F. W. 
Gamble. London, 8vo, xxxv + 486 pp., 73 figg. 
501. *Marshall, W. Zoologische Plaudereien. 3 Sammlung. 8vo, 
Leipzig, 245 pp., illustr. 
502. Martinotti, C. Sur quelques particularites de structure des cellules 
nerveuses. Arch. ital. Biol, xxxii, pp. 292-308, 2 pis. 
503. Masterman, A. T. On the origin of the Vertebrate notochord and 
pharyngeal clefts. Rep. Brit. Ass. lxviii, pp. 914-916. 
