The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . From MiaH and Denny, The Cotkroach, LovcU Reeve & Co. Fig. 13.—Ovaries of Cockroach, with Oviducts Od and ColleterialGlands CG. tubes, those of each testis opening into a vas deferens. In somebristle-tails and may-flies, the two vasa deferentia open separately,but usually they lead into a sperm-reservoir, whence issues a median. Frem Miill and Denny, Tht Cociioock, Lovell Rce%e It Co. Fic. 14.—Hinder Abdominal Segment and Ovipositor of FemaleCockroach. Magnified., V &c. Tergites. Od, Vagina. S, 7t
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . From MiaH and Denny, The Cotkroach, LovcU Reeve & Co. Fig. 13.—Ovaries of Cockroach, with Oviducts Od and ColleterialGlands CG. tubes, those of each testis opening into a vas deferens. In somebristle-tails and may-flies, the two vasa deferentia open separately,but usually they lead into a sperm-reservoir, whence issues a median. Frem Miill and Denny, Tht Cociioock, Lovell Rce%e It Co. Fic. 14.—Hinder Abdominal Segment and Ovipositor of FemaleCockroach. Magnified., V &c. Tergites. Od, Vagina. S, 7th Stcrnite. sp, Spcrmatheca. S, Sclcrite between 7th and 8th d. Anterior, and j, S*, 8th Sclerite. (sterna. terior gonapopby: pos- ejaculatory duct. The male opening is on the ninth abdominalsegment, to which belong the processes that form the claspcrs orgenital armature. Accessory glands arc commonly present in con*ncxion both with the male and the female reproauctive poison-glands of the. sting in wasps and bees are well-knownexamples of these. EmdryologyThe Ege.—Among the Hexapoda, as in Arthropods generally,the egg is Targe, containing an accumulation of yolk for the nourish-ment of the growing embryo. Most insect eggs are of an elongateoval shape; some are globular, others flattened, while others againare flask-shaped, and the outer envelope {chorion) isoftcn beautifullysculptured (tigs. 20, d
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
