On Cyrioma; a new genus of Fossil Echinida. 179 



served only the grey kind. Capt. P. P. King, in his account 

 of the survey of the intertropical coasts of Australia, says 

 that he met with a fleet of proas in the Bay of Coepang, 

 and learnt from the Raja in charge of them that a fleet of 

 200 annually leave Macassar for this fishery in January 

 during the western monsoon, coasting from island to island, 

 and having fished till the monsoon breaks up they return, 

 steering north-west, which brings them to some part of 

 Timor, from whence they retrace their steps to Macassar, 

 where Chinese traders purchase their cargoes. Capt. King 

 calculated that each proa carried 100 piculs of Trepang, 

 worth 500 dollars. 



On the Tenasserim coast, where these animals are thrown 

 up by the sea, and may be had in great abundance without 

 diving, Capt. Lloyd informs me he observed two kinds — 

 namely, a white and a dark brown sort ; the first is consider- 

 ed of most value. It is worthy of remark, that they are not 

 found in such numbers as to attract notice so high in the 

 Bay as Arracan, perhaps from the absence of sand and coral 

 rocks. In the harbour of Trincomalee, I have been informed, 

 they are numerous, are taken by divers, and yield some trade, 

 the particulars and extent of which nothing appears to be 

 known. Of the whole order of Echinodermata I have been 

 only able to collect information regarding the existence of ten 

 or twelve species in the Bay of Bengal ; namely, 3 species of 

 Echini, 1 Echinometra, 1 Echinarachnius, 1 species of Scut- 

 tella, 1 Echinolampas, and 2 species of Holothuria. There 

 are probably many more, but these are all I have been able 

 to discover in the shops, bazars, and collections, public and 

 private in Calcutta. 



Figs. 1, 2, 3, plate III, Echinus concretus, spheroidal, 

 depressed, and flat at the base, verucose pustules in vertical 

 series of 15 to 18, a large one on the centre of each plate, 

 and a smaller one at either extremity of the obliterated 

 junction of adjacent plates. Figs 1, 2, represent the manner 

 in which the diameter of the testa varies in different indivi- 



2 T? 



