A History of British Star-Fishes, And Other Animals of the Class Echinodermata
A History of British Star-Fishes, And Other Animals of the Class Echinodermata
Edward Forbes
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Fleming, Brit. An. p. 487. Couch, Cornish Fauna. Hogg, Stockton-on-Tees* Asteriaa dathrata, Penn. Brit. Zool. IV. p. 61, No. 55, {Junior.) SteHloma rvhensy Agaz. Prod. Forbes, Wem. Mem. VIII. p. 121. g2 Digitized by Google 84 uBASTsm^. The Oommon Orossfish has generally five rays, occa- sionally six, and not unfrequently as few as four. The rays are rounded, and taper gradually to a point. They are commonly about three and a half times as long as the disk is broad, and the breadth of each is so...mewhat less than a third of its length. Both disk and rays are reti- culated, and at the angles of the reticulations arise conical blunt spines, the bases of which are surrounded by circles of thickly-studded spinules. The spines generally form a more or less regular keel on the upper surface of each ray, and sometimes an irregular circle round the disk. In the spaces between the reticulations are numerous small, cleft, pincer-shaped, flattened, pedunculated spinules. Beneath, the avenues taper according to the shape of the rays, and are not so contracted at their origins as in the next species.
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