318 bulletin: museum of comparative zoology. 



My attention was first attracted to this variety while dredging at 

 the Tortugas. Two specimens were taken in one haul and their very 

 deep uniform color and relatively short arms led to the impression that 

 they were something new. Later examination showed that the short 

 arms were due to the fact that all were regenerating, and this youthful 

 portion has the white stripe so characteristic of 0. angulata. The 

 material in the M. C. Z. contains two specimens of 0. angulata from 

 Cuba which agree completely with the Tortugas specimens and the 

 larger of these I have selected as the type of the variety. The disk 

 is 9 mm. in diameter and the arms are about 40 mm. long. The disk 

 is covered with numerous bifid and trifid stumps as in typical 0. 

 angvlaia, the relatively small radial shields being more or less bare. 

 The color is uniformly deep purplish red, except that orally the mouth- 

 frames and bases of the arms are yellowish white. The color is not 

 so dark as in the Tortugas specimens but this may be the result of 

 longer preservation. At the very tips of the arms faint indications 

 of the dorsal stripe can be detected. In the smaller Cuban specimen 

 (disk-diameter, 5 mm.) one arm is regenerating and this and the tips 

 of the other arms are reddish white. 



This is a very well-marked variety and will be easily recognized 

 either in life or in museum material, but it is obviously only a color- 

 form and no doubt intergradations with typical 0. angulata occur. 

 The Tortugas specimens were found in 6-8 fms. of water on a bottom 

 covered with sponges. 



Ophiothrix angulata var. phlogina, var. nov. 

 4>\6yivos = flaming, in reference to the brilliant color. 



Holotype — M. C. Z. 4,220 and 8 Paratypes, M. C. Z. 4,221. Flor- 

 ida: Dry Tortugas, June, 1917. on bottom rich in sponges, 6-8 fms. 

 Carnegie Expedition. H. L. Clark coll. 



As in the case of the preceding form, my attention was attracted 

 to this beautiful variety while dredging at the Tortugas. It is rather 

 common there between Loggerhead and Garden Keys in 6-8 fms. on 

 a bottom where sponges abound. The specimens taken were all small, 

 the largest having the disk only 5-6 mm. across and the arms 20-25 

 mm. long. In the holotype, the entire upper surface was a brilliant 

 red-orange while the under arm-plates and mouth-frames were yel- 

 lowish. In most of the paratypes, the tips of the arms are more or 

 less banded and intergradation with var. poecila is brought about by 



