. The microscope and its revelations. the Dermaleichi. especially the males, and such creatures asM i/f>l>i are distinct and often very different fromeach other; the reproduction is oviparous or ovo-viviparous — pos-sibly in rare and exceptional instances viviparous. The ova areusuallv elliptical or oval : in those which have a hard shell acurious stage known as the • deiitov ium exists; as the egg increasesin si/.e the shell splits into two symmetrical halves, which remainattached to the lining membrane, but are widely separated, the ]{< Im in •!• slmiild tic in Professor liii
. The microscope and its revelations. the Dermaleichi. especially the males, and such creatures asM i/f>l>i are distinct and often very different fromeach other; the reproduction is oviparous or ovo-viviparous — pos-sibly in rare and exceptional instances viviparous. The ova areusuallv elliptical or oval : in those which have a hard shell acurious stage known as the • deiitov ium exists; as the egg increasesin si/.e the shell splits into two symmetrical halves, which remainattached to the lining membrane, but are widely separated, the ]{< Im in •!• slmiild tic in Professor liiitschlis observations in , xiv. p. 17<i, JIM |»L-. Viirlt/liiiws ]|HT in Arbeit. Zool. Ziinl. lust. Wilrz-ix. p. 1. PLATE XX. Ac anna. West,.Newman cliromo MITES IOO9 membrane becoming the external covering in the space left. Theeggs of the so-called stone-mite (Petrobia lapidum) are discoidal andsculptured; they occasionally appear in countless numbers over alarge space of ground in a single night, making the place lookwhitewashed ; they have been mistaken for fungi and called Crate-rium pyriforme; they are good microscopical objects. The larvaeof all Acarina, except Phytoptus and possibly Dermanyssus, arehexapod; the fourth pair of legs is absent. The nymphal stage isusually the principal period of growth ; occasionally, however, it iswanting. The nymph is an active chrysalis, as in the Orthopt&ra; itusually undergoes several ecdyses. In many species of the Oribatidcethe whole skin is not cast, but splits round the edge of the body,and the dorso-abdominal portion, remains attached to the new skin ;often it has a row of elegant spines or hairs round its edge ; thusafter two or three ecdyses these spines
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
