. Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . ns of the teeth are broader ; the serratedfree ends present a more uniform appearance, and thelateral portions of each tooth are more prolongedabove the central parts. Notwithstanding the increaseof size, they appear to be very delicate in structure,being almost colourless ; they require very carefulpreparation and much enlargement to make themout very distinctly. When these conditions areobtained, a. very pretty set of organs is following formula describes the group
. Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . ns of the teeth are broader ; the serratedfree ends present a more uniform appearance, and thelateral portions of each tooth are more prolongedabove the central parts. Notwithstanding the increaseof size, they appear to be very delicate in structure,being almost colourless ; they require very carefulpreparation and much enlargement to make themout very distinctly. When these conditions areobtained, a. very pretty set of organs is following formula describes the groups, ,1,2,3,3,2,1, or thirteen in each lobe; the twosingle teeth occupy the posterior, the other singlethe anterior position in the mouth. The first of theformer is of the blow-fly type, all the others beingdeeply serrated and quite different in appearance. Although quoting the above as being representativeof this species, the preparation of a number of objectsfor verification revealed the fact, that the abovenumber — though most frequently occurring — wasnot constant, some specimens ranging as high as. Fig. 62.—Teeth of AntJiomyia pluvialis. or slightly convergent at their extremities ; anal vein prolonged tothe margin ; legs always black or grey. The organs of dentition, although bearing some resemblance to those of the house-fly, differ altogether four distinct rows in two of the central members ofthe group. Can there be any connection betweenthis and Rondanis distinct species before referredto ? If any reader of these notes who has a thorough HARDWICKES SCIENCE-GOSSIP. 101 acquaintance with the two species, and is sufficientlyinterested, will kindly forward the writer a fewspecimens of both, an elucidation of this questionmay follow. Specimens so sent should be placed ina small tube containing dilute glycerine, otherwisethey will be useless for the purpose they wouldhave to serve. STUDIES OF COMMON PLANTS. No. V. The Dandelion (Leoniodon taraxacum). By E. A. Swan,
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