A history of British star-fishes, and other animals of the class Echinodermata . s balls brittle-star. 35 OPIIIUMD&. BALKS BRITTLE-STAR. Ophiocoma Ballli. Thompson. Ophiocoma Dallii, Thompson, Annals of Natural History, vol. V. (April, 1840),p. 99. Specific Character.—Disk round or angular, covered with imbricated scales,two diverging broadly wedge-shaped scales at the base of each ray. Upper ray-scales fan-shaped ; lateral ray-plates, each bearing four spines, which are as longor sometimes longer than the breadth of the ray. This pretty little species, one of the many contributions
A history of British star-fishes, and other animals of the class Echinodermata . s balls brittle-star. 35 OPIIIUMD&. BALKS BRITTLE-STAR. Ophiocoma Ballli. Thompson. Ophiocoma Dallii, Thompson, Annals of Natural History, vol. V. (April, 1840),p. 99. Specific Character.—Disk round or angular, covered with imbricated scales,two diverging broadly wedge-shaped scales at the base of each ray. Upper ray-scales fan-shaped ; lateral ray-plates, each bearing four spines, which are as longor sometimes longer than the breadth of the ray. This pretty little species, one of the many contributions tothe fauna of our islands, for which we owe thanks to theindefatigable researches of Mr. Ball, was dredged by thatgentleman several years ago in Dalkey Sound on the coastof Dublin ; and was described and named after its disco-verer by Mr. Thompson in the fifth volume of that valuableperiodica], the Annals of Natural History. Several spe-cimens of the Ophiocoma Ballli were taken; the disk of thelargest was two and a half lines broad, and the rays werenearly four times as long as its breadth. The disk is ratherflat, rou
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