A history of British star-fishes, and other animals of the class Echinodermata . ant in a few fathoms water in Orkney andShetland. In the Irish Sea it is common in deep water, off 56 the shores of the Isle of Man. On the Irish shores and Mr. Hyndman take it by dredging in thelochs of Strangford and Belfast, and Mr. Ball in DublinBay. In texture this Ophiocoma is much more leathery thanits allies. It is a good subject in which to examine thenervous system. Surrounding the mouth, but at somedistance from it, is a white nervous cord, which seemsdouble; radiating from it are
A history of British star-fishes, and other animals of the class Echinodermata . ant in a few fathoms water in Orkney andShetland. In the Irish Sea it is common in deep water, off 56 the shores of the Isle of Man. On the Irish shores and Mr. Hyndman take it by dredging in thelochs of Strangford and Belfast, and Mr. Ball in DublinBay. In texture this Ophiocoma is much more leathery thanits allies. It is a good subject in which to examine thenervous system. Surrounding the mouth, but at somedistance from it, is a white nervous cord, which seemsdouble; radiating from it are fifteen pairs of nervousthreads, which are arranged in threes, but have not acommon origin,— indeed, there appear to be no ganglionicenlargements. Of each set of three pairs the central goesto the body between the rays, and the two lateral runup the sides of two different rays, so that each ray is pro-vided with two pairs from two different sets. This ar-rangement is very distinct and easily seen, by removing theupper surface of the disk and the enclosed stomach 000DSIR. S ISRITTLE-STAR. 57 OPHWRIDM. OPIIWRM.
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Keywords: ., bo, bookcentury1800, bookdecade1840, bookidhistoryofbritish00forb
