. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. Phyllopod Crustacea, allied to Apus and Nebalia. G case and Gh. Trilobites. Gh Gh ANNELIDA (The burrows are frequently called Fucoids, see note in Wenlock Group). Scolecites (Irregular worm-burrows in the sandy silt, crossing each other at various angles. Such burrows, filled with the excreta of the worm, are common in all rocks. (Salter, Quart. Geol. Journ. Vol. I v. p. 223). Scolecoderma antiquissimum, Salter (Trachy- derma in various
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. Phyllopod Crustacea, allied to Apus and Nebalia. G case and Gh. Trilobites. Gh Gh ANNELIDA (The burrows are frequently called Fucoids, see note in Wenlock Group). Scolecites (Irregular worm-burrows in the sandy silt, crossing each other at various angles. Such burrows, filled with the excreta of the worm, are common in all rocks. (Salter, Quart. Geol. Journ. Vol. I v. p. 223). Scolecoderma antiquissimum, Salter (Trachy- derma in various works) is a common large worm-tube in the Hollybush sandstone, which sandstone I have referred to the middle Lingula flags. Scolecoderma is the tube itself, often membranous, of the worm. Cruziana semiplicata, Salter (Mem. Geol. Surv. in. pi. 3). A curiously plaited tube, fur- rowed along the middle. The genus was very abundantly spread over the world in Cambrian times. It is rather an anomalous form. But the ridgy plaiting of the upper surface probably has reference to the double rows of lamellae covering the back of the short broad worm. CRUSTACEA Phyllopoda. Hymenocaris vermicauda, Salter (Mem. Geol. Surv. Vol. in. 1866, pi. 1, fig. 2, p. 293). A shrimp-like form, evidently allied to the living Nebalia and the Silurian Ceratiocaris. The carapace is ample and undivided. Body with 7 or 8 ? joints. Tail with 6 appendages. CRUSTACEA Trilobita. Agnostus trisectus, Salter, Decade 11, M. G. S. pi. 1, fig. 11. The centre tail-lobe is triple. Agnostus princeps, Salter (Decade 11,1. c. figs. 1—5); also Mem. Geol. Surv. Vol. in. pi. 5, fig. 1 a). (A. princeps, var. Salter, Mem. Geol. Surv. 1. c. pi. 5, fig. 16). A common Lingula flag species, with radiating striae to the limb of the head. [These must be obtained for the collection.] [Near Bangor: Ffestiniog, Dolgelly, &c. common.] Hollybush sandstone, Mal- vern. (Presented by Dr. Grindrod.) [Common near Bangor.] a. 15, Borth har
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