OF WESTEEN SIND. 173 



the less height, in the concavity of the actinal surface, and in the character of the 

 ambulacral petals. 



Dimensions. Length of the test 19'5 millim., breadth 17'5 millim., height 10 millim. 



Locality. In the Khirthar series of strata : — North by east of Meting. Survey- 



, G280 



number -gg-. 



Illustrations of the Species in Plate XXXI. 



Fig. 6. Abactinal view of the test: natural size. 



7. Actinal view of the test : natural size. 



8. Longitudinal profile of the test : natural size. 



9. Abactinal area, showing the ambulacral petals and apical disk : magnified. 

 10. The peristome and surrounding portions of the test : magnified. 



10. EcHiNOLAMPAS .EQUivocA, Duncan & Sladen. Plate XXXII, Figs. 1-3. 



There is a specimen of Echinolampas in the collection, which is unfortunately so 

 much crushed and damaged by weather-action that a complete description is imprac- 

 ticable. The characters, however, are sufficiently remarkable to distinguish the form 

 readily from the other members of the genus from the Khirthar series of strata, and on 

 this account we have accorded to it a specific name. The following points may be 

 noticed : — 



The test is of moderate size, subdepressed and elongately oval in marginal con- 

 tour, the breadth being seven eighths of the length. The dorsal surface is low, but 

 convex. Seen in longitudinal profile the anterior slope is a full and well-rounded curve 

 (probably emphasized in our specimen by crushing) ; and the posterior slope is gentle, 

 passing with a well-rounded sweep over the slight posterior rostration, and terminating 

 precipitously at the posterior extremity. 



The apical disk is very excentric in front, and the ambulacral rosette is compara- 

 tively small, and, owing to the shortness of the posterior petals, has a very excentric 

 appearance generally. The odd anterior ambulacrum is the shortest and narrowest ; 

 the anterior pair of petals are equal to or slightly longer than the posterior pair, 

 and are decidedly the broadest. The outline of the petals is elliptically lanceolate, 

 expanding rapidly from the apical extremity, and converging towards the outer extre- 

 mity. The poriferous zones are unequal, especially those of the anterior pair of petals, 

 in which the anterior zone is shorter by ten or eleven pairs of pores than the companion 

 zone. The posterior zone of the posterior petals is similarly shorter than its com- 

 panion ; but to what extent the condition of the specimen does not enable to be deter- 

 mined accurately. The breadth of the zone is very uniform throughout, and is only 

 very slightly broader midway than at the outer extremity. The inner pores are round 

 or faintly oval transversely, and the outer larger and transversely elongate, becommg 

 comma-shaped on the outer portion of the zone. The pores of a pair are united by a 

 well-defined conjugating furrow ; and the position of the pairs is oblique in relation to 

 the median line of the petal, the obliquity increasing towards the outer extremity of 



2a 



