21,1 Shaw: Merrillosphaera 115 
to the male coenobium which Carter, in his fig. 8 a (Plate 8, fig. 
48), had depicted in a somewhat different style and with less 
skill. It appears probable to me that the Endosphaerosira of 
Klein was improperly assigned to Volvox aureus, and that it 
belongs rather to one or more of the species of the genus 
Merrillosphaera. 
The sperm bundles of the Endosphaerosira, according to Klein, 
contained invariably thirty-two spermatozoids. 
MERRILLOSPHAERA TERTIA (MEYER) COMB. NOV. 
When Meyer (’96) was working with material that he had 
collected at Marburg, Germany, and that he named Volvox 
tertius he, apparently, had not seen Klein’s second Volvox paper 
(’°89B), for he made no mention of it in either his text or his 
list of references. The characters appearing in Meyer’s meager 
description, by which his material is distinguishable from Mi- 
gula’s material as described by Klein, are four: First, the 
occurrence of smaller numbers of reproductive bodies, which 
ranged from four to eight in a coenobium, as compared with 
eight to eleven; second, the occurrence of oospores in numbers 
greater than the numbers of asexual reproductive bodies, which 
were recorded as ten, twenty, and thirty, associated with four, 
five, and three asexually produced daughters, respectively; 
third, the restriction of the antheridia to the reproductive hemi- 
spheres of the male coenobia; and, fourth, the fact that in some 
daughter coenobia the gonidia had begun to divide while the 
daughters still remained within the mother coenobia. The latter 
point is shown by the following statement in Meyer’s (’96, 
p. 190) text: 
* * * Die anfangs stets hellgriinen Zellen e? beginnen sich theilweise 
schon in den Tochterkugeln zu theilen, kénnen aber auch in der Tochter- 
kugel bis ungefiahr 50 » gross werden, ohne sich zu theilen, und sich erst 
theilen, wenn die Tochterkugel frei wird. * * * 
The ranging of the number of asexual reproductive cells 
downward from eight, and the segmentation of some of the 
gonidia before the birth of the coenobia containing them, are 
characters by which Meyer’s species approaches Volvox africa- 
nus West (’10). The occurrence of oospores in the numbers 
ten, twenty, and thirty is indicated only by numbers in Meyer’s 
table of combinations of reproductive bodies found in coenobia. 
The data given in that table have been rearranged in Table 1 
given herewith, and the three cases indicated by the letter G 
constitute the only information given about the ten, twenty, and 
thirty oospores. 
