228 



ECHINODERMA OF THE INDIAN MuSKUM, PART VII. 



median concavity (in lateral view) ; no trace of dorsal spines or of overlap ; the 

 cirri become somewhat compressed in the distal two-thirds and therefore appear 

 very slightly broader in lateral view ; opposing spine represented by a slight 

 tubercle, terminally situated, which may be obsolete. 



Scattered calcareous granules are present along the disk ambulacra, and 

 sinf'le perisomic interradial plates may be present between the TBr, as in Antedoii 

 bifida. 



Fig. 42. — Mastigomelta microp 

 Lateral view of the type. 



Radials even with the edge of the centrodursal ; IBr, very short, five or six 

 times as broad as long, of uniform height, not quite in apposition basally, the 

 lateral edges diverging distally ; I Br, triangular, about half again as broad as 

 long, the anterior angle somewhat produced, the proximal border as long as the 

 proximal edge of tlie I Br,. 



Ten arms, ])robal)]y about sO mm. long, tlieii' structure being the same as 

 tli.tse of .1/. /lii//(/l/fi:m. The distal intersyzygial interval is three oblique muscu- 

 lar articulations. 



