OF KACHH AND KATTYWAK. 47 



A large tuberculation of prominent bosses and large mamelons, placed on flat 

 scrobicules surrounded by slightly raised divisional deformed circles, exists actinally. It 

 is largest on either side of the posterior ambulacra behind the mouth, smaller in 

 front, and diminishes towards the margin, over which it merges into the minute tuber- 

 culation of the abactinal surface. The plastron, long and not very broad, and the ambu- 

 lacra on either side are bare until close to the projecting point beneath the truncation 

 for the periproct. A short triangular process of tubercles extends in front of this point, 

 and merges into the ornamentation of the subanal plastron, which is environed by 

 a subanal fascicle. 



An exceedingly faint fasciole is peripetalous and bounds the great tubercles. (The 

 anus and the test close by are crushed.^ 



Length 46 millim., breadth 37 millim., height 9 millim. (crushed). 



Locality. One mile east of Goir, near Narainsir. Nummulitic series of Kachh. 

 Survey-number C 043 B. 



Illustration of the Species in Plate XII. 

 Fig. 2. Abactinal view : natural size. 



2. EusPATANGUs KOSTEATUS, d'ArcMac. Plate VII, Figs. 1-8. 



This species is described by MM. d'Archiac and Haime *, and the types are in 

 the museum of the Geological Society of London. The condition of the specimens was 

 not sufficiently good to enable a reliable diagnosis, and the figures given by those authors 

 are restorations. The peculiar abortion of the inner pairs of pores of the anterior 

 poriferous zone of the antero-lateral ambulacra, which is seen in the specimens lately 

 collected, is not visible in the old types, and there is no trace of a fasciole in these 

 last. The shape and the position of the great tubercles enable Euspatangus rostratus 

 to be recognized ; but of course the generic position of the form is open to doubt, and 

 we have considered it in our remarks on the fauna. 



A considerable number of specimens of different sizes is amongst the collection 

 from Kachh, and some of them are very perfect in their condition. Some are identical 

 in shape with the types of d'Archiac and Haime, and others are more bilobed or 

 notched in front than the original type. 



MM. d'Archiac and Haime give the following diagnosis : — 



Body elongate, suboval ; subbilobed in front, rather attenuated behind, and trun- 

 cated at the extremity ; rather thickened behind. Ambulacral petals tolerably well 

 closed, rather sharp-pointed, moderately broad, and rather long. Poriferous zones 

 rather narrow, costulate. Anterior ambulacrum only slightly depressed in front, with 

 indistinct pores. The lateral interradia are broader than the anterior, and the posterior 

 is narrow and swollen behind ; it is smooth like the ambulacra, but the others are 

 covered with large tubercles unequal in size and sunken in shallow fossettes. The 

 peripetalous fasciole appears to be submarginal. The periproct is marginal, suboval, 

 and angular above, higher than broad. Inferior aspect nearly plane, but swollen in 



* Op. cit. p. 218, plate xv, fig. 3. 



