54 THE FOSSIL ECHINOIDEA 



1. 1 Phtlloclypeus, sp. Plate XII, Fig. 8. 



A very fragmentary specimen of a large Echinoid is from the gypseous shales from 

 the hills east of Lynyan in the Ranikot series. 



The marginal outline is oval and broadest in front, the margins are slightly tumid, 

 and the upper part is rather low and conical, the sides being convex. The apex is nearly 

 central. The remnants of the ambulacra shovs' that they were widely open, the pori- 

 ferous zones being moderately broad, ending in a point close to the margin. The ridges, 

 between the conjugate pores, are coarsely granular (one row), and the poriferous zone 

 is narrower than the interporiferous area. 



The most interesting part of the test is around the peristome, where a phyllode is 

 preserved. The pores are evidently doubled in several instances, and the bourrelets do 

 not appear to have been large. 



There is then some doubt about this specimen belonging to the Conoclypeidse, and 

 we are disposed to place it with de Loriol's genus Phylloclypeus. 



Height of specimen 2 inches ; breadth 3-^- inches ; length 4J inches. 



Survey-number G fff*- 



Illustration of the Species in Plate XII. 

 Fig. 8. The phyllode : magnified. 



Genus PLESIOLAMPAS. 



Plesiolampas, Duncan Sf Sladen, Foss. Echin. of Sind, Pal. Indiea, series xiv. p. 9 (1882). 



1. Plesiolampas placenta, sp. nov. Plate XIII, Figs. 4-9, and Plate XIV, Fig. 1. 



The test is considerably depressed, slightly longer than broad, with a squarely oval 

 marginal outline. Abactinally the slope from the, slightly eccentric in front, apical 

 system is not quite so decided anteriorly as posteriorly ; the margins are tumid, and in 

 front more so than behind, where there is no rostration. Actinally the peristome is 

 deeply seated in a concavity and is slightly in front of the centre, and the test is 

 swollen around it to the margins, but less so posteriorly. The periproct is entirely 

 inframarginal, reaches close to the edge, and is elongate oval. 



The apical system is small and compact, the madreporic body is central and 

 minutely granular on the surface. There are four generative pores, and the front 

 pair are closer together than, the hind ones. The ocular plates and pores are 

 small. 



The ambulacra are subequal, the posterior being the longest, rather wide, slightly 

 petaloid, widely open, and extend to a short distance from the margin. The interporiferous 

 zones are broad, slightly raised, and are widest about midway, and the poriferous zones 

 of each ambulacrum are equal ; the pairs of pores are numerous, oblique, conjugate, the 

 outer pore being elongate and the inner subcircular, and the costal ridges have a 

 row of minute granules on them. 



