The Quarterly journal of the Geological Society of London . Vol. 54.] EATUSTA OP THE SKIDDAW SLATES. 481 Postlethwaite).. [Nat. size.] measaring together ^\ mch (2-1 ^- mm.); four stipes ot the 2nd f,,,catus, so. nov. order are developed irom these as a result of dichotomous division. These constitute the main stipes of the rhabdosoma. On each main stipe, at a distance of -^-^ inch (14-7 mm.) from the point of dichotomy, the first lateral branch is given off at an angle of about 70°; a second lateral branch at a similar angle, at a distance of ^ inch from the first (8-5 mm.);

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The Quarterly journal of the Geological Society of London . Vol. 54.] EATUSTA OP THE SKIDDAW SLATES. 481 Postlethwaite).. [Nat. size.] measaring together ^\ mch (2-1 ^- mm.); four stipes ot the 2nd f,,,catus, so. nov. order are developed irom these as a result of dichotomous division. These constitute the main stipes of the rhabdosoma. On each main stipe, at a distance of -^-^ inch (14-7 mm.) from the point of dichotomy, the first lateral branch is given off at an angle of about 70°; a second lateral branch at a similar angle, at a distance of ^ inch from the first (8-5 mm.); and a third at the same angle, and at a similar distance. There seems to be no further branching. The length of the stipes is 1| to2 inches (44 to 50 mm.), and themaximum width is -^-L-inch (1*05mm.). All details regarding the thecseare obscure, but they number twentyto the inch (eight in 10 mm.), are incontact for about half their length,and have oblique apertures. The species differs from ScMzograptus reticulatus, (1) In having three branches of the 3rd order, and situated closer together ; (2) In lateness of dev

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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology