A history of British star-fishes, and other animals of the class Echinodermata . FIDDLE HEART-URCHIN. 187 Genus Brissus. Klein. Generic Character.—Body cordate, convex, having two sets of ambulacra,dorsal and oral; four of the dorsal ambulacra petaloid ; a dorsal impression in-closing the ambulacra; sub-anal impression transverse, sub-inferior. FIDDLE HEART-URCHIN. Brissus lyrifer. Forbes. Specific Cliaracicr.—Body ovate ; a deep and narrow dorsal depression ; ambu-lacra deep; dorsal impression fiddle-shaped; post-oral spinous space narrow,lanceolate. The genus Brissu
A history of British star-fishes, and other animals of the class Echinodermata . FIDDLE HEART-URCHIN. 187 Genus Brissus. Klein. Generic Character.—Body cordate, convex, having two sets of ambulacra,dorsal and oral; four of the dorsal ambulacra petaloid ; a dorsal impression in-closing the ambulacra; sub-anal impression transverse, sub-inferior. FIDDLE HEART-URCHIN. Brissus lyrifer. Forbes. Specific Cliaracicr.—Body ovate ; a deep and narrow dorsal depression ; ambu-lacra deep; dorsal impression fiddle-shaped; post-oral spinous space narrow,lanceolate. The genus Brissus connects the genus Spatangus withAmphidotus. It has the form of the latter with the 188 SPATANGACE^E. post-anal impression of the former, and a dorsal impressionpeculiar to itself. One British species, which I have calledthe Fiddle Heart-Urchin, on account of the peculiar shapeof the dorsal impression, belongs to it. The Brissus lyriferI cannot find described or figured in any author on thissubject. It is a very handsome and remarkable species,having a red body, with pale yellowish white spines, andthe dorsal and post-a
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