Chambers's encyclopædia; a dictionary of universal knowledge . Holoptycliius Nobilissimus (Agass.). Clashbennie, on the Firth of Tay, by Mr Noble ; itnow forms part of the British Aluseum collection,[t is a foot across by two feet and a half longwithout the tail, which is wanting. It is nearlyperfect, lying on its back, with the scales and theventral fins in their original position. The genus is peculiar to the Old Peed Sandstoneand Carboniferous Measures; eight species beingfound in the former, and nine in the latter. It hasbeen proposed to confine the name Holoptychius tothe fossils of the O
Chambers's encyclopædia; a dictionary of universal knowledge . Holoptycliius Nobilissimus (Agass.). Clashbennie, on the Firth of Tay, by Mr Noble ; itnow forms part of the British Aluseum collection,[t is a foot across by two feet and a half longwithout the tail, which is wanting. It is nearlyperfect, lying on its back, with the scales and theventral fins in their original position. The genus is peculiar to the Old Peed Sandstoneand Carboniferous Measures; eight species beingfound in the former, and nine in the latter. It hasbeen proposed to confine the name Holoptychius tothe fossils of the Old Red Sandstone, and to givethat of Rhizodus, which Owen applied to the teethremains before their connection with the fish wasknown, to the Holoptychians of the Coal Measures,which have the outer row of teeth more robust andobtuse, and the inner set longer, shai^per, and moreslender than in the older species. HOLOTHUEIA, a genus of Lcldnodermata. Holothuria:a, H. phantapus; b, buccal appendages of II. phanfapus;c, II. papulosa ; d, an isolated branch of the buccal append-ages of H. papillosa; e, II. cucumis; /, II. vittata, (q. v.), the former limits of which are now those ofa family, Holotliuridcc, divided into numerous genera. Sea-slug and Sea-cucumber are popular names ofsome of the animals of this family. The Holo-tlhuridce have not the covering of calcareous platescharacteristic of the more typical Ecldnodermata,but a soft leathery muscular integument, very-irritable, and capable of great distention and con-traction. Some of them are almost globose, some somuch elongated as to be almost worm-like ; but thesame individual is often capable of extending itselfto several times the length which it has in a state ofrepose. In locomotion, the bodj is extended and con-tracted as by the annelides, but the principal organsof locomotion, as iu star-fishes and sea-urchins, aresuckers or Avihulacra (q. v.), of whichthere are usually f
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondo, bookyear1868
