OF WESTERN SIND. 237 



There is a good deal of variation in the length, and consequently in the marginal contour 

 of this species, some examples, which are usually young, being much more elongate 

 than others, which are more regularly oval. There is a single specimen of a wide well- 

 rounded form (with survey-number -joo")' which perhaps shows this in a greater degree 

 than usual ; we do not, however, see any reason to recognize it as a nominal variety. 



Memarks. The general facies of this species is very unlike that of typical Euspa- 

 tangi, and we can fully appreciate the doubt expressed by d'Archiac and Haime 

 when referring their single, small, and poorly preserved specimen to that genus. The 

 character of the tuberculation and the form of the test are in much closer accord with 

 Macropneustes, and we should have so placed it with very little hesitation, were it not 

 for the presence of the well-developed subanal fascicle. We cannot dispel the impres- 

 sion that the differences which at present separate Macropneustes, Euspatangus, and 

 Pervpneustes are exceedingly artificial ; and although we are by no means prepared to 

 admit the desirability of uniting all the forms comprised within these three divisions 

 under one genus, we are far from being satisfied with their present distinction by means 

 of empirical adherence to a specific formula based on one or two characters only. A 

 larger series of better-preserved specimens of the various species in each of the groups 

 named than at present exists, is necessary before the question can be approached with 

 much pjospect of success. 



A form whose general facies bears much resemblance to the Sindian species was 

 described and figured by de Loriol, under the name of Macropneustes Lefehvrei, in his 

 Monograph on the Nummulitic Echini from Egypt * ; better-preserved specimens are 

 again figured and described in his recently published work on the Eocene Echinoidea 

 from Egypt and the Libyan Desert f . The only bar to the generic alliance of the two 

 species appears to be the presence of the subanal fascicle. The absence of the subanal 

 fascicle in M. Lefehvrei is especially remarked upon by M. de Loriol, who also observes 

 that its presence would place the species in Euspafangus. Euspatangus avellana might 

 well be taken as the fulfilment of the supposition in point. In the drawing given of 

 the Lybian example of M. Lefehvrei there appears to be a tantalizing naked band 

 shown by the artist in op. cit. pi. xi. fig. 2 d, which simulates a fasciole in a remarkable 

 manner, both in outline and position. 



Dimensions. 



a. h. e. d. e. f. 



millim. millim. miUim. milliin. millim. miUim. 



Length of the test . . 38 32 21 21-5 12 11 



Breadth of the test . 32-5 27 17 18-5 10-5 10 



Height of the test . . 22 19-5 11-6 11-25 8 5-75 



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Localities. In the Khirthar series of strata : — 

 i. Karra range, south of Trak. Survey-number -^^^ 

 ii. Gagar hill, east side of the Surjana range. Survey -number -yj^ 

 * Op. cit. p. 75, pi. ix. figs. 7-9. t Ojp. cit. p. 50, pi. xi. figs. 2, 3. 



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