. Cassell's natural history. Animals; Animal behavior. THE 161 the membranous lung-sacs; some zoologists .also believe that inspiration is caused by a similar jigency. The true trachcie, when present, are analogous to those of the Insects and Myriopods, open like them by stigmata, and ramify tliroughout the body. The great diversity of organisation presented by the members of this order renders their division i into families exceedingly clear and distinct, and we may recognise with facility the following five groups :â T.âResEJration by lung-sacs [Pcdipalpi). a. Maxillary palpi wi
. Cassell's natural history. Animals; Animal behavior. THE 161 the membranous lung-sacs; some zoologists .also believe that inspiration is caused by a similar jigency. The true trachcie, when present, are analogous to those of the Insects and Myriopods, open like them by stigmata, and ramify tliroughout the body. The great diversity of organisation presented by the members of this order renders their division i into families exceedingly clear and distinct, and we may recognise with facility the following five groups :â T.âResEJration by lung-sacs [Pcdipalpi). a. Maxillary palpi with nippers; stigmata four pairs; terminal segments of abdomen forming a slender tail, with a sting at the end ........ Family 1. Scorpionice. b. Maxillary palpi with imperfect nippers, or simple; two pairs of stigmata; no caudal sting . . . â 2.âPhkynid-b. II.âRespiration by tracheae [Adclarthrosomata). a. Cephalothorax not segmented : * MaxiUary palpi with nippers ..... â 3.âC';. t Maxillary palpi simple ..... â 4.âPiiALANGiinjii. b. C'enhalothorax divided into four segments .... â 5.â FAMILY I.â The species of this famOy are exceedingly uniform in their structure. They consist of a rather broad anterior part, composed of the cephalothorax and seven distinct segments following it, at the hiirder extremity of which come live narrower segments fonnini;- a sort, uf tull, teiniiuated by a bulbous piece having a short but sharp point. At the front â \ve see a pair of jointed organs having regular nippers, like the so-called claws of a Crab or Lobstei, and behind these foui pairs of amb\ilatoiy limbs. The type is so interesting and im portant,however, th it we must describe its structure a little moie particularly. The upper sui face of the cephalo thorax is covei-ed by a shield-like horny plate, upon which from three to siv pairs of simple eyes are to be seen, a pair of extra size being placed close to the middle line of the shield, w
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