. Chimæroid fishes and their development. Fishes; Chimaeridae. 26 CHIM^ROID FISHES AND THEIR DEVELOPMENT. the oviducts was made, for the filaments were so perfectly formed that they might well have yielded some interesting notes as to their terminal. That this is finally a bulbous organ there can now be no doubt. Ah Tack early made a drawing of it, but the writer's skepticism* continued until word was received from Dr. Wilbur (May i, 1899) that he had himself seen the terminal organ, describing it as a "sort of disc," and figuring it (plate i, fig. 3) very much as Ah Tack had
. Chimæroid fishes and their development. Fishes; Chimaeridae. 26 CHIM^ROID FISHES AND THEIR DEVELOPMENT. the oviducts was made, for the filaments were so perfectly formed that they might well have yielded some interesting notes as to their terminal. That this is finally a bulbous organ there can now be no doubt. Ah Tack early made a drawing of it, but the writer's skepticism* continued until word was received from Dr. Wilbur (May i, 1899) that he had himself seen the terminal organ, describing it as a "sort of disc," and figuring it (plate i, fig. 3) very much as Ah Tack had From all this it follows that the ovulation of this Chimaeroid is highly specialized. The elaborate egg-case is not shot out quickly nor festooned on fixed objects by its terminal filament, as in the case of recent selachians, but is carried. Fig. 12.— Region of ventral fins of a specimen of Cfiimaera pKanlasma, in wfiich egg-capsules protruded from oviducts. This specimen was taken (Misaki. Japan) in water of about 150 fathoms and shows the intestme everted, a condition usual in a fish taken from such a depth. about for a longer time, protruding from the oviducts before it is made fast to a suitable object. This is possibly a stone, X and if the eggs are thus attached near or among rock masses, we have a suggestion why embryo-bearing capsules have never been dredged. *Pains were taken to observe the process of depositing the eggs. To this end a fish was secured in which egg- capsules were just protruding. This specimen was closely watched, but succeeded, nevertheless, in depositing the eggs unobserved. The process could not have taken more than lo minutes. The capsules were immature, possessing scarcely more than a stump of the filament (plate ii, fig. lo). tUnfortunately this capsule was lost in a hatching-case swept away by a storm. t.\h Tack states that several times his trawl lines have brought to the surface capsules which still retained small stones attached to the te
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfishes, bookyear1906
