Echinoidea from the Kerimba Archipelago. 43 



The measurements of this fine specimen are worth recording. 

 Height, 13 mm. Long, dia., 158 mm. Trans, dia., 147 mm. 



Post, petals, 29 mm. Odd petal, 34 mm. Width, porif. zone, 5 mm. 

 Width, inter, porif. zone, 5 - 5 mm. Anus from edge of test, 37 mm. 



Mouth from anterior edge, 76 mm. 



Distribution. — Indian Ocean, especially the west, Amboina, Philippines, 

 and Straits of Macassar. 



18. Maretia planulata, Gray. 

 A. Ag., Rev. Ech., p. 570. 



Localities. — III., Mtundo Bay, sand, shell, and coral, 6 fathoms ; VI., 



Kero-Nyuni Bay, sand, 5 to 10 fathoms ; X., Montepes Bay, sand and 



mud, 5 to 22 fathoms. 



A series of seven specimens of various ages. All the specimens 



seem to be a little flatter than is usual in this species. The slight anterior 



ambital grove, never at all prominent, is practically indistinguishable in 



the largest specimens. The variations in colour (in spirit specimens) 



common in this species are not noticeable. A uniform straw colour 



prevails, except in one specimen, in which the lateral petals on one side 



show a certain amount of violet brown coloration, and the same colour 



appears on the primary tubercles. The primary spines in this case are 



banded with faint violet brown. 



Height, 16 mm. Long, dia., 68 mm. Trans, dia., 54 mm. 

 „ 12 mm. „ „ 46 mm. „ „ 37 mm. 



Distribution. — Western Pacific through the Indian Ocean to Zanzibar. 



19. Lovenia subcarinata, Gray. 

 A. Ag., Rev. Ech., p. 577. 



Localities. — VI., Kero-Nyuni Bay, sand, 5 to 10 fathoms ; XIII., Pemba 

 Bay, mud, 10 to 20 fathoms. 



Several fine specimens. 



The specific characters which distinguish this species from L. elongata 

 in young specimens — the sub-triangular actinostome, the outward slope 

 from the anal system to the abactinal surface, and the triangular actinal 

 plastron — are maintained in the older ones. More mature specimens show 

 no departure from the small number of primary tubercles on the abactinal 

 surface in the anterior half of the posterio-lateral interambulacra. 



