Proceedings of the Royal Physical Society. 



III.— Echinoidea from the Kerimba Archipelago, Portuguese East 

 Africa (Mozambique). By R. N. Rudmose Brown, D.Sc. 



(Received 12th October 1909. Read 22nd November 1909.) 



The collection of Echinoids described in the present paper was made by 

 Mr J. J. Simpson, M.A., B.Sc, on the coast of Portuguese East Africa 

 between latitudes 10° 42' S. and 12° 58' S. from September 1907 to May 1908. 

 All were gathered on a coral bottom iu depths under 20 fathoms. The 

 collection comprises 21 species, and is chiefly interesting from a dis- 

 tributional point of view, our previous knowledge of the Echinoderm fauna 

 of that particular part of the East African coast being very meagre indeed. 



The 21 species of the present collection are all forms known from the 

 tropical waters of the Indian and Pacific Oceans, with the exception perhaps 

 of Goniocidaris canaliculata, which is characteristic of the colder southern 

 circumpolar waters but has also been found at Zanzibar. Several species 

 show an extension of range. Lovenia subcarinata until recently had only 

 been recorded from Pacific waters. Mr Simpson and I found it at the 

 Mergui Archipelago in 1907, and now it is recorded from the western shores 

 of the Indian Ocean. Curiously enough the allied L. elongata does not 

 occur among these specimens nor was it found in the Mergui Archipelago, 

 although more than once it lias been recorded from the Indian Ocean. 



Chaetodiadema granulatum is one of the " Siboga " species described from 

 Dutch East Indian waters. Brissopsis luzonica is another Pacific species 

 which previously had not been recorded from the Indian Ocean. - Otherwise 

 the facies of this collection is very similar to that of the Echinoid fauna of 

 the Indian Ocean generally. The complete list of the species is as follows : — 



1. Phyllacanthus baculosus (Lain.), A. Ag. 



2. Phyllacanthus verticulata, A. Ag. 



3. Goniocidaris canaliculata, A. Ag. 



4. Echinothrix turcarum, Ret. 



5. Astropyga radiata, Gray. 



(i. Chaetodiadema granulatum Mortensen. 



7. Echinomctra hicunler, de Blainv. 



8. Echinostrephus molare, A. Ag. 

 !*. Microcypltus maculatus, Agass. 



10. Salmacis bicolor, Agass. 



1 1 . Salmacis Dussumieri, Agass. 



12. Toxopueustes pileohis, Agass. 



