OF WESTEEN SIND. 355 



surface. There is no doubt about the presence of two fascioles, a well-developed 

 subanal and a peripetalous, which passes from the extremity of each posterior petal to 

 the end of the antero-lateral with a very slight departui^e from a perfectly direct line. 

 The fasciole turns sharply round the antero-lateral petal and takes an oblique direction 

 towards the anterior part of the odd ambulacrum ; it then suddenly turns at right 

 angles, passes outwards for a short distance, and again turns toward the odd ambulacrum 

 and crosses it. The fasciole crosses the broad and low surface of the odd-interradium 

 just behind the ends of the posterior ambulacra. 



There is no sulcus or notch for the anterior ambulacrum at the margin of the 

 test, and there is only a very faint depression on the abactinal surface close to the 

 apical system for the narrow and ill-developed ambulacrum. The margins are well 

 rounded in the most perfect specimen, and the actinal surface is convex and marked 

 with a long, narrow, downward-projecting plastron. The posterior lip of the mouth 

 projects downwards and is well arched, being at a lower level than the rest of the 

 margin of the peristome. The antero-lateral ambulacra are at a very wide angle, 

 are long, narrow, slightly bent with the convexity forwards, and the grooves are shallow. 

 This shallow condition is seen in a specimen which has not been crushed : but those 

 forms which have been compressed irregularly always present rather swollen interradia 

 and as a consequence deepish actinal grooves. 



The interporiferous areas are very narrow and slightly granulated and the poriferous 

 zones are wide. The pairs are close and numerous and there is a narrow costa forming 

 a ridge between the successive pairs. The pores are rather wide apart and conjugate, 

 elliptical and in rather deep grooves. A fine granulation is on the costae and inter- 

 mediate parts. 



The posterior ambulacra are longer than the antero-lateral, are in shallow and 

 rather sinuous grooves, which end remotely from the posterior edge of the test, and are 

 close together at the apical system, forming an acute angle there. 



The apical system is not perfectly preserved ; but it can be seen that there are 

 two large posterior basals perforated by large pores and separated by the prolongation 

 backwards of the madreporite. This body is large and pear-shaped and is continuous 

 with a small plate which appears to have a small generative pore. The posterior radials 

 are very small. Considering the dimensions of the tests, the apical systems of the 

 different specimens are small. 



The interradia are moderately tumid, the posterior most so. 



There are sparely distributed small tubercles on the interradia restricted to within 

 the fasciole, except in the anterior region. The tubercles are variable in size ; but all 

 are small and some have a shallow, narrow scrobicule, others and most have not. The 

 tubercles, which are placed without order, are perforate and crenulate ; a mass of minute 

 granules covers the abactinal part of the test. 



The ambulacra on either side of the plastron actinally, are narrow and very long 

 before they become broad near the subanal region. The antero-lateral form triangular 

 spaces, with large ear-shaped or acutely ovate peripodia, well developed and rising above 

 the common surface. The same shaped peripodia are seen in the anterior ambulacrum, 



