. Science-gossip . thefertilization of this alga, set himself to answer thefollowing. Seeing there is no union of the proto-plasm of the male cell with that of the femaleorgan, was it necessary for the production of fruitthat a male cell should unite with the trichogyne ?And he found this was necessary, for, when hegrew, under their natural conditions, female plantsisolated from male plants, so that the male cellscould not come into contact with the trichogynes, theprocarps or female organs did not develop into , Beres/ord Street, Cainbcrwell, THE NEW BRITISH J. E. Coo
. Science-gossip . thefertilization of this alga, set himself to answer thefollowing. Seeing there is no union of the proto-plasm of the male cell with that of the femaleorgan, was it necessary for the production of fruitthat a male cell should unite with the trichogyne ?And he found this was necessary, for, when hegrew, under their natural conditions, female plantsisolated from male plants, so that the male cellscould not come into contact with the trichogynes, theprocarps or female organs did not develop into , Beres/ord Street, Cainbcrwell, THE NEW BRITISH J. E. Cooper. PETRICOLA pholadifnrmis, Lawk, is a native ofNorth America, it ranges from PrinceEdwards Isle to St. Thomas. In this country itappears to have been first noticed by Mr. WalterCrouch, , at Burnham-on-Crouch, about fouryears ago. The first specimen found was a deadshell, but Mr. Crouch has since obtained livingexamples at the same place. In the spring of thisyear Mr. A. S. Kennard found this species alive. Petricola plwladifonnis. Lawk. near Heme Bay, and the writer picked up severaldead specimens on the shore near Sandwich. Itthus appears to be established in both the RiverCrouch and the Thames estuary. How it got therein the first instance is not certain, though probablyit was introduced with American oysters. ThisPetricola bears a very striking external resemblanceto the common Pliolas Candida, and may have beenpassed over by collectors mistaking it for that , Soutliuood Lane, //j;;/<i<iii, -V. G 3 148 SCIENCE-GOSSIP. STRUCTURAL FEATURES IN AMERICAN ROTIFERA. By Dr. Alfred C. Stokes.{Continued from page 122.) Taphrocampa selexcra, Gosse. npHIS interesting larviform creature is not com-men in my vicinit}-, but from a single shallowpool near my home it has been taken sparingly, thelocality having, perhaps, supplied me with half-a-dozen specimens, over which I have observed a fewstructural points which appear not hitherto to ha\-ebeen noticed. The rotif
Size: 2642px × 946px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
