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OPIilOTHRIX ORSTEDII. 



Ophiothrix rOSUla Forbes. 



Stella scolopendroides ; liosula scolopendroides LijfCK. De Stel. Mar., p. 52, PI. XXVI. 



Fig. 42. 1733. 

 Asterias fracjilis O. F. Muller. Zool. Dan., p. 28, PI. XCVIII. 1789. 

 Ophiura fragilis et O. tricolor Lamk. Hist. Anim. s. Vert., II. p. 546. 1816. 

 OpJiiocoma rosula Forbes. Brit. Starfishes, p. 60. 1841. 

 Ophiothrix rosula FoRBES. Linn. Trans., XIX. p. 151. 1842. 

 Ophiothrix fragilis, 0. echinala, 0. tricolor, et 0. Fe'russacii Mull. & Trosch. Syst. Asteriden, 



pp. 110-112. 1842. 



LIST OF SPECIMENS. 



Whence obtaiaed. 



143 

 417 

 392 



3fuseum of Comparative Zoology. 



North Europe. 

 Oresund. 



St. Va-est-la-Hougue, 



France. 

 Cette, France. 

 Oran, Algeria. 



Prof. Sars, 1832. Alcoholic 

 University Museum, 



Copenhagen. " 



Jardin des Plantes. " 



T. Lyman. 



Jardin des Plantes. " 



Ophiothrix Orstedii Lutken. 



Ophiothrix Orstedii Lijtken. Vidensk. Meddelelser. Jan., 1856. 

 Ophiothrix Orstedii Lutken. Addit. ad Hist. Oph., p. 149. 



Special Marks. — Bluish or greenish, with cross lines of white on 

 arms, above. Spines on disk slender and rather long. 



Description of a Sp)eciinen. — Diameter of disk, 8""- ; outer edge of 

 mouth-shield to outer corner of opiDOsite mouth-slit, S.G""' ; width of 

 arm without spines, 2.7""°- ; length of arm about 58"""- ; distance from 

 outer edge of mouth-shield to the points of the tooth-papillae, to 

 that between the corners of the mouth-slits as 1.6 : 1.6. Tooth- 

 papillce arranged in six horizontal rows, three in each row, except the 

 lowest one, which has usually only two ; they have the appearance of 

 a bundle of small spines, soldered compactly side by side ; the papillas 

 on the sides of each row project towards the centre of the mouth more 

 than the middle one does. Teeth five, the highest small and somewhat 

 pointed ; lowest evidently made of soldered tooth-papilla?. The mouth- 

 shields are closely soldered with the surrounding parts, so that it is 



