504 The Philippine Journal of Science 1922 
and by having large gonidia that are differentiated early; and 
V. spermatosphaera Powers (’07 and ’08) in which the dif- 
ferentiation of the gonidia is not so early. Another, described 
as a “second form of Volvoz’ by Powers (’07), has received 
the generic name Besseyosphaera (Shaw, ’16). 
A satisfactory treatment of the two Philippine species of 
Volvox, based on a more extended study of both living and 
preserved material from various localities, has been most 
greatly interfered with by the presence in the same habitat of 
a number of other species of large Volvocaceae presenting novel 
features that insistently claimed attention. 
LITERATURE CITED 
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differences. Ann. & Mag. Nat. Hist. III 3 (1859) 1-20, pl. 1. 
CoHN, F. ('75). Die Entwickelungsgeschichte der Gattung Volvox. 
Festschr. z. G6pperts 50 jahrig. Doktorjubilaum. Breslau (1875) 34 
pp., 1 col. pl. 
EHRENBERG, C. G. (’38). Die Infusionsthiere als vollkommene Organis- 
men. Berlin and Leipzig (1838). (Not seen.) 
Harper, R. A. (18). Binary fission and surface tension in the development 
of the colony in Volvox. Brooklyn Bot. Gar. Mem. 1 (1918) 154-166. 
Pl. 2 and figs. 1-4, 
JANET, C. (712). Le Volvox. Limoges (1912) 151 pp. 
JANET, C. (’14). Note préliminaire sur l’oeuf du Volvox globator. Limoges 
(1914) 12 pp. 
KLEIN, L. (’89A). Morphologische und _biologische Studien tiber die 
Gattung Volvox. Jahrb. f. wiss. Bot. 20 (1889) 133-211, pls. 10-12. 
Kirin, L. (’89B). Neue Beitrige zur Kenntniss der Gattung Volvox. 
Ber. d. deutschen bot. Ges. 7 (1889) 42-58, pl. 8. 
Kugin, L. (90). Vergl. Untersuchungen iiber Morphologie und Biologie 
der Fortpflanzung bei der Gattung Volvox. Ber. d. naturf. Ges. 
Freiburg i. B. 5 (1890) 92 pp., pls. 2-6. 
MEyvER, A. (95). Ueber den Bau von Volvox aureus Ehrenb. und Volvox 
globator Ehrenb. Bot. Centralbl. 63 (1895). 
Meyer, A. (96). Die Plasmaverbindung und die Membranen von Volvox, 
- Riicksicht auf die thierischen Zellen. Bot. Zeit, 547 (1896) 187-217, 
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OLTMANNS, F. (’04). Morphologie und Biologie der Algen. Jena (1904 
and 1905). 
OveRTON, E. (’89). Beitrag zur Kenntniss der Gattung Volvox. Bot. 
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Powers, J. H. (07). New forms of Volvox. Trans. Am. Microscop. Soc. 
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three new species. Trans, Am. Microscop Soc. 28 (1908) 141-175, 
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SHaw, W. R. (’16). Besseyosphaera, a new genus of the Volvocaceae. 
Bot. Gaz. 61 (1916) 258 and 254. 
