24 Records of the Indian Museum. |Vou. XI, 1915.] 
T. investigatorts. The reduced oxyasters are scattered in the main 
body of the sponge, while the amphiasters are collected in small 
groups and associated with films of horny substance in the inte- 
rior. They also appear, therefore, to have been arranged in the 
same manner as their homologues in T. investigatoris. 
Type.—A microscopic preparation mounted in Canada balsam. 
No. Z.E.V. 6639/7. Ind. Mus. 
Locality.—King Id., Mergui Archipelago; in dead coral (J. 
Anderson). 
The form of the amphiaster is unlike that of any other species 
in the genus, for the ‘‘ nodules” of these spicules, even when they 
are smooth as in Thoosa armata, are usually short, stout and 
rounded. It is clear, however, that their form in TJ. laeviaster 
does not depart very widely from the generic type and is really 
nearer that of the normal amphiaster of T. radiata (Topsent, 1887, 
pl. vii, fig. rz) than that of the homologous spicule of T. armata. 
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