OF WESTEEN SIND. 229 



the four petals, and their pores within its area differ from those without and may 

 disappear. 



1. Beetnia carinata, d'Archiac & Haime. 



There is a single badly preserved, crushed, and almost unrecognizable specimen of 

 this species included amongst the collection of Khirthar Echini from Sind, respecting 

 which, however, we have grave doubts, on account of the nature of its matrix, as to the 

 accuracy of its being referred to the Khirthar series of strata. The fossil probably 

 belongs to a higher horizon, and was included in the collection under notice by mistake. 

 As Breynia carinata occurs in higher beds in Sind, and is there found in a perfect state 

 of preservation, we reserve any further remarks upon the species until a subsequent 

 fasciculus, when dealing with the form from its authenticated horizon. We have pre- 

 viously noticed the species when describing the Echinoidea from Kachh. The present 

 example is wholly unfitted for illustration, and almost worthless in a morphological 

 point of view. 



Locality. Accredited (probably by mistake) to the Khirthar series of strata. 

 West side of Bhago-Thoro Hill, south of Sehwan. Survey-number ^?- 



Genus MACROPNEUSTES, Agassiz, 1847. 



Test of large or medium size, more or less inflated, cordiform ; anteal sulcus scarcely 

 perceptible, except at the ambitus. 



Ambulacral summit subcentral or excentric in front. Apical disk compact ; four 

 generative plates, with the central madreporiform body narrow and elongate. Odd 

 anterior ambulacrum different from the others, formed of simple and very small pores. 

 Paired ambulacra petaloid, elongate, sometimes more or less excavated, the posterior 

 pair usually rather longer than the anterior. 



Peristome bilabiate, excentric in front, 



Periproct at the summit of the posterior extremity. 



Tubercles very unequal, the large ones isolated, prominent, and confined to the 

 abactinal surface, the general tuberculation of the test being small and crowded. 



One fasciole, peripetalous, which does not always limit the large tubercles. 



1, Maceopneustes speciosus, Duncan & Sladen. Plate XXXVIII, Figs. 1-5. 



Test of large size. Marginal contour elongately oval, slightly indented anteriorly, 

 rather more contracted and less fully rounded posteriorly. The greatest breadth is 

 median, and is a little more than four fifths of the length, or in the proportion of 

 0-83 : 1. The abactinal surface is depressed, with its curvature regularly convex, 

 springing from the comparatively thin, abruptly rounded margins, uniformly all round 

 the test. The greatest height of the test is excentric posteriorly, but not to a very great 

 degree ; consequently when the low dorsal convex curve is seen in longitudinal profile 

 the posterior slope is shorter and rather more inclined than the anterior ; the greatest 

 height is exactly two fifths of the length. The actinal surface is almost flat. 



2h 



