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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ... position of the eye-specks, or the distribution of the cilia, for distinction--if I could get others; because all these are found, in practice, so very difficult to determine. The existence of eyes in some Coluri and Metopidia, for instance, is so very uncertain and indeterminable, that I incline to agree with Dujardin in rejecting some of Ehrenberg's genera. The distinction between Lepadella, Metopidia, and Squamella, is more than doubtful; while in Metopidia and Colurus, individuals of indubitably the same species are found, some displaying eye-specks, and others in which no search detects them.--P.H.G. Genus COLUBUS, Ehrenberg. GEN. CH. Body subglobose, more or less compressed; lorica of two lateral plates, open in front, united on the back, gaping behind, and in general) wholly so up the belly; frontal hood in form of a hook, not retractile; foot permanently extruded, of distinct joints, terminated by two furcate toes. A very familiar group, of minute dimensions, agreeable form, and sprightly action, the Coluri give the impression of being, while sub-circular in lateral outline, very thin in transverse diameter. This, however, is an illusion, arising from their being most frequently presented to the eye in the lateral aspect. When we do catch a glance at one in turning or swimming, we see that the body is moderately broad, ventricose, and even globose in the middle. The lorica consists of two glassy shells, each a segment of a hollow sphere, which are, normally, soldered edge to edge, at the fore-back, and begin to gape at the loins, the cleft then passing round behind, usually widening for emission of a stout foot, and passing up the belly to the front, by which time it has generally become as wide as the body itself. So constructed it may be imagined...
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