154 



OPHIOTHRIX ORSTEDII. 



Oplliothrix rOSUla Forbes. 



Stella scolopexdroides ; Rosula scolupendroides Linck. De Stel. Mar., p. 52, PI. XXVI. 



Fig. 42. 1733. 

 Asterias fragilis O. F. Muller. Zool. Dan., p. 28, PI. XCVm. 1789. 

 Ophiura fragilis et O. tricolor Lamk. Hist. Anim. s. Vert., 11. p. 546. 1816. 

 Ophiocoma rosula Forbes. Brit. Starfishes, p. GO. 1841. 

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

 Ophiothrix fragilis, 0. ecJiinata, O. tricolor, et 0. Ferussacii Mull. & Trosch. Sj-st. Asteriden, 



pp. 110-112. 1842. 



LIST OF SPECIMENS. 



OpMotlirix Orstedii LutkexX. 



Ophiothrix Orstedii LiJTKEX. A'idensk. Meddelelser. Jan., 1856. 

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



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

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



Description of a Specimen. — Diameter of disk, 8""°- ; outer edge of 

 mouth-shield to outer corner of opposite mouth-slit, 3.6""- ; 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-papilla^, to 

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

 papilloe 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 papilla? 

 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 



