Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . ae, infusoria, etc. They are widely distributed and there arenumerous British species. Fam.—Halacaridae. In the Halacaridae the buccal organs are carried on a distinctrostrum; the appendages of the first pair are either styliform orchelate, and the terminal segment of the palp is conical or styli-form. The skin is strengthened by a number of dorsal and ventralplates. These mites are chiefly marine in haljit, but a few species occurin fresh water. They do no
Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . ae, infusoria, etc. They are widely distributed and there arenumerous British species. Fam.—Halacaridae. In the Halacaridae the buccal organs are carried on a distinctrostrum; the appendages of the first pair are either styliform orchelate, and the terminal segment of the palp is conical or styli-form. The skin is strengthened by a number of dorsal and ventralplates. These mites are chiefly marine in haljit, but a few species occurin fresh water. They do not swim, but crawl on algae and marineanimals. They were first made known by Mr. Gosse, whodescribed several British species in the year 1855. A can. VAM.—B(]clli(l(«. The members oi thisliuiiily are soft-skinnedmites, witli a distinctrostrum. The first pair otappendages are in the formof pincers and tlie palpsare slender and unarmed. These mites are free-living terrestrial forms,which lead a predatorylife. There are a numberof British species. Alittle red species {Bdellalittoralis) is common onour sea-coasts. Table-casoNo. 2f).. Fig. 74. Sarcoj>tcs scabivi, the itch mite, x 100(after Cauestrini). S U B - O K D E i;, V. ASTIGMATA. In these Acari, which are closely alUed to the Prostifpiiafa, there is no trace of a respiratory system. Many of them are parasitic, otiiers are free-living and feed on animal and vegetable is to this sub-order that themite (Sarcoptcs scahici) whichis the cause of itch cheese mite (Tjjroijhjphussiro) is perhaps the most fami-liar of the non-parasitic species {GlijcijjjJiagusdomesticus) is often found inhouses. Drawings of these twospecies are shown in Table-case 26. A tuft of wool, with some oftlie flesh still attached, showingthe scab caused by a Sarcoptidmite {Psoroptes communis, r-g ovis), together with drawings . ^,, , , ,. of the mite itself, is on view Houiic-n-wte, GlycypJiagus domestiais, . X 50
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcrustacea, bookyear19
