The Journal of experimental zoology . Fig. dianthus. Dorsal views. A—Age, 17 days (X47).—Age, 19 days ( X 62). 44 Charles Zeleny. the older branches of II. L-II—-i has two branchlets ( =. pin-nules) and R-II—I has one branchlet. Branchia II on each sidenow shows the beginning of the sixth branchlet or III also has not increased much in size. In Fig. 12 (23 days old) Branch II—i with its six pinnules hasvery evidently taken its place as a prominent part of the branchial. Fig. 12. Hydroides dianthus. Age, 23 days (X75). The first secondary branch of Branch II has as
The Journal of experimental zoology . Fig. dianthus. Dorsal views. A—Age, 17 days (X47).—Age, 19 days ( X 62). 44 Charles Zeleny. the older branches of II. L-II—-i has two branchlets ( =. pin-nules) and R-II—I has one branchlet. Branchia II on each sidenow shows the beginning of the sixth branchlet or III also has not increased much in size. In Fig. 12 (23 days old) Branch II—i with its six pinnules hasvery evidently taken its place as a prominent part of the branchial. Fig. 12. Hydroides dianthus. Age, 23 days (X75). The first secondary branch of Branch II has assumedthe character of an independent main branch with branchlets of its own. The original third pair ofbranches is not shown. apparatus. Branchia II has now added its eighth I and III are still unbranched and have increased com-paratively little in size. In Fig. 13 (23 days old), in which only the right side is repre-sented as both sides are essentially similar, Branchia I for the firsttime shows a trace of branching, seven little branchlets (pinnules)appearing simultaneously. Branchia II has added one newbranchlet making nine in all counting Branchia II—i as the first Compensatory Regulation. 45 one. Branchia II—i has eight pinnules. The character ofBranchia III was not made out. The operculum was seen for the first time six days later at thestage shown in Fig. 15. Fig. 14, taken five days later still (34 daysold), shozus an earlier stage of the operculum. Here it appe
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
