Echinoidea from the Kerimba Archipelago. 41 



12. Toxopneustes pileolus, Agass. 

 A. Ag., Rev. Ech., p. 497. 



Localities. — I., Tunghi Bay, sand, mud, and shell, 5 to 18 fathoms; III., 

 Mtundo Bay, sand, shell, and coral, 6 fathoms ; VI., Kero-Nyuni Bay, 

 sand, 5 to 10 fathoms; IX., Ibo Bay, Matemo Island. 

 A large series of specimens which shows considerable variety in 

 shape ; some specimens are more globular, others are more compressed. But 

 the globular shape is not a development of age for it occurs in some small 

 and obviously young individuals. In outline the test from above is often 

 decidedly pentagonal, less often almost circular. The ambulacral areas 

 are slightly gibbous around the apical system. The actinal surface is 

 only very slightly concave. The spirally arranged bands of colour 

 mentioned by A. Agassiz (loc. cit.) are not obvious in these specimens. 

 Height (mm.) 28 26 22 20 20 17 15 11 



Diameter (mm.) 39 35 29 29 26 26 21 15 



Distribution. — Indian and Pacific Oceans. 



13. Clypeaster scutiformis, Lam. 

 A. Ag., Rev. Ech., p. 512. 



Localities. — X., Montepes Bay, sand and mud, 5 to 22 fathoms ; XIII. , Pemba 

 Bay, mud, 10 to 20 fathoms. 

 A large and a small specimen. The outline of the former is decidedly 

 pentagonal with rounded edges. The abactinal surface, from the swollen 

 border, is convex but slightly flattened again at the apex. The extremities of 

 the poriferous zones of the petals are a little concave. 



Height, 11 ram. Long, dia., 51 mm. Trans, dia., 42 mm. 

 „ 7 mm. „ „ 31 mm. ,, „ 21 mm. 



Distribution. — Japan, Formosa, Malay Archipelago generally, and Indian 

 Ocean including Bea Sea, Ceylon, Mauritius, and Ibo. 



14. Clypeaster humilis, Agass. 

 A. Ag., Rev. Ech., p. 510. 



Locality. — II., Maiyapa Bay, sand, mud, and coral, 10 fathoms. 



Several young individuals having the characteristic form of the adult. 

 Their slightly pentagonal outline gives them a strong resemblance to 

 certain species of Laganum. 



Distribution. — Western Pacific and Indian Oceans. 



