OF WESTERN SIND. 61 



4. Plesiolampas eosteata, sp. nov. Plate XIII, Figs. 1-3. 



The test is moderately depressed, slightly longer than broad, broadly elliptical in 

 marginal outline, broadest close behind the eccentric-in-front apical system, rather 

 narrower in front than posteriorly, and having a slightly rounded-off posterior projection, 

 with a faint depression on either side of it, just posterior to the postero-lateral ambu- 

 lacra. The highest point of the test is at the apical system ; and the surface slopes 

 thence to the margin, which is slightly tumid, and least so where the test is pinched in 

 posteriorly. Actinally the surface of the test is faintly convex ; but the peristome is 

 deeply seated. The periproct is long, oval, and inframarginal, and it does not touch the 

 margin. The apical system has a large madreporic body. The ambulacra are long, 

 widely open ; and there is only the slightest tendency to a petaloid form in the postero- 

 lateral; the anterior is the shortest, and the postero-lateral are the longest. The 

 interporiferous zones are broad, and the ornamentation is irregular, there being spaces 

 where the granulation predominates over the tubercles and scrobicules. 



Height of specimen rather more than ^ inch, length 3 inches, breadth 2-j^o 

 inches. 



Locality. Eanikot series, north by east of Petiani, west of Kotri. Survey- 

 number G fif . 



Illustrations of the Sj>ecies in Plate XIII. 



Fig. 1. The test, from above. 



2. The test, side view. 



3. The periproct. 



5. Plesiolampas polygonalis, sp. nov. Plate XIII, Figs. 10, 11. 



The test is polygonal in outline, moderately tumid at the ambitus, tumid abactinally, 

 highest behind, very concave actinally. The greatest breadth is at the blunt angular 

 projection over the antero-lateral ambulacra ; and the test is narrowed rapidly behind 

 those regions, and less so in front ; it is rather truncated behind, and has a wide angle 

 in front. The apical system is slightly eccentric in front, and is over the deeply seated 

 widely transverse peristome. The periproct is inframarginal, elongated longitudinally, 

 and narrow. The ambulacra are narrow, long, open, and very faintly petaloid. 



Length l-j^ inch, breadth l^-^ inch, height i% inch. 



Locality. North-east of Petiani, west of Kotri, Ranikot series. Survey-number 



G280 

 T35- 



Illustrations of the Species in Plate XIII. 



Fig. 10. The test, from above. 



11. The test, longitudinal outline. 



Genus EOLAMPAS, gen. nov. 

 Test small, tumid, ovoid, subdepressed ; the greatest height corresponding with 

 the apical disk, and very eccentric in front ; the anterior slope rapid and precipitous, 

 the posterior subrostrate towards the extremity. 



K 



