CLARK: BRITTLE-STARS. 329 



e' Disk with scales, spotted or variegated; arm-spines 6 or 7. 

 / Middle arm-spines smallest, at least on base of arm. 



g Arm-spines 6; upper arm-plates thin, squarish, a little wider 



than long; disk with more or less bright orange .... hartmeyeri 



g' Arm-spines 7 or 8; upper arm-plates thick, rounded, not 



wider than long ; no orange aranea 



f Middle arm-spines not smaller than upper. 



g Arm-spines 6, very slender, acute; radial shields and scales 

 adjoining their proximal ends, white, thus forming a pair 

 of conspicuous white streaks on disk in each radius . polysticta 

 g' Arm-spines 7, less slender, obtuse; radial shields not con- 

 spicuously white pantherina 



Ophiopsila annulosa. 



Ophianoplus annulosa Sars, 1857. Nyt. mag. naturvid., 10, p. 23. 

 Ophiopsila annulosa Liitken, 1859. Add. ad hist. Oph., pt. 2, p. 136. 



This large species (disk 11 mm. across) is known from the western 

 Mediterranean Sea and from the southwestern coasts of Great Britain. 

 It is perhaps the adult of 0. aranea but nothing is as yet known of its 

 growth-changes . 



Ophiopsila fulva. 



Lyman, 1878. Bull. M. C. Z., 6, p. 227. 



The unique holotype of this species was taken off Havana, Cuba, in 

 175 fms. No authentic specimens have been collected since, so far 

 as published records show. 



Ophiopsila polyacantha. 



H. L. Clark, 1915. Mem. M. C. Z., 25, p. 297. 



The unique holotype of this species was taken by the Siboga in 

 33 fms. on Borneo Bank, in the Dutch East Indies. 



Ophiopsila paucispina. 



Koehler, 1907. Bull, sci., 41, p. 314. 



The only known specimen of this species is in the Paris Museum. 

 It was taken at Fernao Veloso Bay, Mozambique. 



