. A text-book of invertebrate morphology. Invertebrates. 486 INVEHTEBRATE MORPHOLOGY. In Scutigera, a form whicli frequents the warmer parts of the world, the dorsal surface of the body is covered in by eight shieldlike folds which conceal a certain number of the segments, which are about fifteen in number. Lithobius has the same number of segments and is common under stones, etc., as is also Geophilusand Scolopendra, both elongated forms, the former usually without eyes, while the latter usually possesses them but has only some nine or ten pairs of stig- mata. Some of the species of iScohpend
. A text-book of invertebrate morphology. Invertebrates. 486 INVEHTEBRATE MORPHOLOGY. In Scutigera, a form whicli frequents the warmer parts of the world, the dorsal surface of the body is covered in by eight shieldlike folds which conceal a certain number of the segments, which are about fifteen in number. Lithobius has the same number of segments and is common under stones, etc., as is also Geophilusand Scolopendra, both elongated forms, the former usually without eyes, while the latter usually possesses them but has only some nine or ten pairs of stig- mata. Some of the species of iScohpendra, especially those living in warm countries, grow to a considerable size and are capable of inflicting a dangerous wound. 4. Order Symphyla. The order Symphyla contains a number of small forms referable to one or two genera, of which the best known is the genus ScolopendreUa (Fig. 224). Unfortunately the details of the structure of the members of the group are by no means well known, a circumstance all the more to be regretted since ScolopendreUa seems to possess certain Insect-like features. The body is elongated, and on the dorsal surface possesses a number of plates which overlap slightly, but which do not correspond in number with the ap- pendages. The head bears a pair of long many-joiuted antennae, and behind these, in the region of the mouth, is a pair of mandibles and a single pair of maxillsB, both these last-named ap- pendages being deeply imbedded as it were in the tissues of the head, their Fig. 334.'- ScolopendreUa *ips °^ projecting. The first pair of immaculaia (from lbunis). trunk appendages is not transformed into maxillipeds as in the Chilopoda, but is ambulatory in function, and most, but not all, of the succeed- ing segments, of which there are apparently fourteen, bear a pair of five-jointed legs terminated by two claws. Attached to the coxal joints of most of these appendages is a peculiar spurlike process, internal to which is situated a protrusible
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