I9I3-] T. L. BoMFORD : Ophiiiroids in the Indian Museum. 



221 



those in the centre, and distinctly conical. On the radial shields 

 these conical tuberosities attain their greatest development : there 

 are three or four on each shield and they are separated by intervals ; 

 at the outer end of each shield, except on one, are two large 

 cones in contact at their bases. The outermost of these cones is 

 the larger and measures 4 mm. in height. 



Each inter-brachial space forms a semicircular bight in the disc 

 margin. The thick, but unsupported skin of this space is bounded 

 above by four or five tuberosities, not distinct from those 

 on the dorsum of the disc, and there may be a feeble indication 

 of a few small tubercles under the skin of this region. At the 

 sides of this space are the openings of the genital bursae. The 

 skin of the space forms a valve-like flap which closes the upper 

 and outer ends of these openings, reducing the aperture to a curved 

 sht, but leaves a wider piriform opening below. The length of 

 the bursal slit is 4 mm. 



The madreporite does not project into the soft inter-brachial 



ah c 



Fig. 2. — Girdle and tentacle hooks of Astrocladus dofleini, x 200. 



area, but is wholly situated on the firm skeleton of the under side 

 of the disc. It forms an almost circular area, about i"2 mm. in 

 diameter, and is slightly concave. 



The skin on the under side of the disc is also thick and 

 finely granular. 



The teeth and mouth papillae are spiniform but not so slender 

 as in the genus Astrodendrum. The arms divide at the disc margin, 

 the primary divisions being equally well developed. Each primary 

 division begins to branch at a distance of 10 mm. from the disc, 

 and the branching is unequal as in Astrocladus exigims (Lamarck). 



The dorsum of the arms is beset with tuberosities, like those 

 on the disc; there are generally two on each segment. At the 

 proximal part of the arm they form blunt cones, on bases measur- 

 ing I mm. or more. These tuberosities, diminishing in size, can 

 be traced beyond the ninth division of each arm. 



Tentacle papillae begin at the second bifurcation of the arms, 

 and form three rough rounded knobs close together. In the more 



