48 Proceedings of the Royal Physical Society. 



Archaster angulatus, M. and T. 



This typically shallow-water species is represented in the collection by 

 four specimens of different size, all captured in the same haul of the dredge, 

 in Mtundo Bay, between the islands of Wamizi and Kifuki. 

 Their measurements a are as follows : — 



72-58 r=10 



22=55 r = 9-5 



22 = 36 r = 7 



72 = 27 to 29 r=Q 

 R therefore varies from 4 - 8r to 5"8r. 

 In the first and largest specimen one arm has evidently been regenerated. 

 This is the first record, as far as we can discover, from the extreme 

 western side of the Indian Ocean. 



Locality. — Station III., Mtundo Bay (Wamizi Island to Kifuki Island). 

 Previously recorded from — West Australia ; Freemantle ; Port Darwin ; 

 Torres Strait; New Guinea; Philippines; Fiji Is.; Mauritius. 



Astropecten Hemprichii, M. and T. 



Several specimens of various ages and slightly different in superficial 

 appearance represent this species. They were obtained in three separate 

 localities, viz., Tunghi Bay, Mtundo Bay, and Montepes Bay. They agree 

 exactly with those of the same species in the British Museum, collected 

 by H.M.S. " Alert " on the Mozambique Coast. One specimen has been 

 regenerating three arms from the disc. 



Localities. — Station I., Tunghi Bay; Station III., Mtundo Bay (Wamizi 

 Is. to Kifuki Is.); Station X., Montepes Bay. 



Previously recorded from — Mozambique Coast ; Red Sea ; Mauritius ; 

 Ceylon ; Tuticorin ; Mergui Archipelago. 



Astropecten polyacanthus, M. and T. 



In the specimens, which we have identified with this species, the first 

 supero-marginal plate is strongly armed with a vertical spine. The second 

 supero-marginal on each side of the median interradial line is devoid of 

 a spine, while the remainder have the same structure as the first. 



Sladen draws attention to a specimen in which this characteristic absence 

 is not pronounced. 



This species is fairly abundant on the coast, and its distribution is 



1 All measurements are in millimetres. 



