. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. J 548 Bashjord Dean Memorial Volume IMMATURE OVARIAN EGGS Among the frilled-shark material loaned by the Department of Zoology of Columbia University are five ovarian eggs of different sizes. No. 1 (42 x 34 x 34 mm.) is greatly flattened on one side and is devoid of follicular membranes. No. 2 (45 x 38 x 38 mm.) is shaped like a hen's egg and is surrounded with fragments of the follicular membranes. No. 3 (46 X 46 X 35 mm.) is without follicular membranes. No. 4 (58 x 50 x 44 mm.) is enclosed in follicular mem- branes. No.
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. J 548 Bashjord Dean Memorial Volume IMMATURE OVARIAN EGGS Among the frilled-shark material loaned by the Department of Zoology of Columbia University are five ovarian eggs of different sizes. No. 1 (42 x 34 x 34 mm.) is greatly flattened on one side and is devoid of follicular membranes. No. 2 (45 x 38 x 38 mm.) is shaped like a hen's egg and is surrounded with fragments of the follicular membranes. No. 3 (46 X 46 X 35 mm.) is without follicular membranes. No. 4 (58 x 50 x 44 mm.) is enclosed in follicular mem- branes. No. 5—also enclosed in follicular membranes— measures 60 x 49 x 49 mm. These are all immature eggs, probably about half-grown. Other sizable (and in this case larger) ovarian eggs are those noted and sketched by Dean and taken from his huge" April 27. Of the 16 eggs in question in the two ovaries, 14 measur- ed 70 x 30 mm. and 2 were 60 X 30 mm. They approached maturity much more than the smaller eggs just listed above. Last of all are the huge ovarian eggs reported by Momose (1938) fromhisl510-mm. speci- men taken November 28. These, measuring 80-83 mm. in diameter (Text-figures 3 and 9), were almost mature as will be seen from the data in the following Text-figure 12 A ripe ovarian egg in its ovarian and follicular membranes. The circular area on top is probably a thin place in the membranes where the follicle will rupture to set the egg free into the coelom. This is probably the same egg as that shown in Figure 1, plate I. It is presumably figured in natural sizie. Photograph by Bashford Dean. A MATURE OVARIAN EGG Such an egg is shown in Figure 1, plate I. In the original drawing, it measures 90 X 96 mm., and it was presumably drawn in natural size. It is of approximately the same size as the eggs in round capsules shown in plate I. Its measurements are close to those of eggs with gastrulae or very young embryos described by Nishikawa
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Keywords: ., book, bookcentury1900, booksubjectfishes, booksubjectfishesfossil
