OF WESTERN SIND. 149 



As far as can be made out, the primary tubercles of the abactinal surface appear to be 

 somewhat more widely spaced than in the preceding species, and with wider granulated 

 interspaces between the scrobicules ; but only the faintest indication of their former 

 presence remains here and there, and not a trace of the ornamentation of the actinal 

 surface is preserved. 



The peristome is subcentral or only very slightly excentric in front, and sunken in 

 a well-defined depression of the actinal surface ; it is large, irregularly subpentagonal, 

 and oblique, the major axis being directed towards the right anterior interradium. 



The periproct, although large, and its length slightly greater than the larger 

 diameter of the peristome, is smaller proportionally than in any of the other species 

 described. It is subpyriform, with the contracted extremity directed towards the 

 peristome, the intervening distance being nearly equal to its own length. It is placed 

 mucli nearer to the margin of the test. 



Eemarks. This species is, perhaps, nearly related to A. dilatatus, Agassiz, but 

 appears to be well distinguished by the greater lateral expansion of the test, the more 

 excentric position of the apical disk, and the more tumid margins. The poriferous 

 zones are relatively broader, and the petals, as a whole, are perhaps narrower in the 

 Sind specimen ; the peristome also appears to be more deeply depressed, and the actinal 

 surface more strikingly pulvinate. The periproct is smaller than in any other species 

 of Amblypygus, whilst it is remarkably large in A. dilatatus ; and there is no trace 

 whatever of the furrows in which the poriferous zones of that species are sunken on 

 the actinal surface. 



Dimensions. 



millim. 



Length of the test 53-5 



Breadth of the test 55 



Height of the test 22 



From centre of apical system to anterior extremity . 23 

 » 5j posterior extremity . 30-5 



Greatest width of the poriferous zone 1-75 



Width of the interporiferous area at this place . . 3-50 

 55 ,■> at the margin . . 5-75 



Greatest width of a petal 6'75 



The proportion of length to breadth = 1 : 1-028. 



to height = 1 : 0-411. 



55 



G280 



Locality. In the Khirthar series of strata : Eohri, Upper Sind. Survey-number ^ 



Illustrations of the Species in Plate XXVII. 



Fig. 7. Abactinal view of the test: natural size. 



8. Actinal view of the test : natural size. 



9. Longitudinal profile of the test : natural size. 



X 



