OF WESTEEN SIND. 343 



Mr. Blanford states that he has never seen the form in any other than a Miocene 

 formation, and it is evident that the specimen from the Khirthar series (a solitary one) was 

 not found in place. Moreover the species abounds in the Gaj beds and not in the Nari of 

 Sind. We may assert that the species is the most characteristic of the Miocene of Sind. 



With regard to the species Breynia carinata, we were able to correct some of the 

 descriptive parts of d'Archiac and Haime's notice of their unfortunately ill-preserved 

 specimens, in our Monograph of the Kachh Echinoidea, and Messrs. Medlicott and 

 Blanford had previously indicated the presence of minute pairs of pores within the 

 area of the internal fascicle. Since the publication of our Monograph a great number 

 of specimens have been examined from the Gaj series, and some are in a most wonderful 

 condition of preservation. We have now evidence regarding the correct shape of the 

 form in the adult stage and when half-grown, and we have proofs of the comparatively 

 slight variation in the shape and structure of this most highly specialized Spatangoid. 



The description of the species by its founders was admirable, and we could have 

 wished that they could have had our opportunity. We propose therefore giving the 

 translation of the diagnosis of MM. d'Archiac and Haime, and to add the results 

 of our examination' of good specimens. 



1. Beetnia caeinata, d'Archiac & Haime. Plate LIV, Figs. 1-9, and Plate LV, Figs. 1-8. 



The test is elongate, low, bilobed in front, narrowed behind and truncated pos- 

 teriorly ; upper surface very slightly convex. 



The measurements are — length 9 centim., breadth 7 centim., height 3 centim. ; a 

 second is 6 centim. in length. 



Actinal surface of the test almost flat, except near and in front of the anus, 

 where it presents, in the median line, an oblong and subcarinate keel. In some 

 individuals the odd interradial area is slightly raised above the anus. 



The four generative pores are small and close ; the madreporic body is indistinct, 

 oval, and elongate in the antero-posterior direction of the test. The plates which 

 surround the apical disk immediately, are surrounded by an oval-shaped non-sinuous 

 fasciole, rounded behind, and the anterior branches of which become close on the level 

 with the ends of the antero-lateral ambulacra. Those plates which belong to the 

 ambulacra within the fasciole, are perforated by very small pores in a series which 

 forms an angle with the line of the other ambulacral pairs. The large pairs of pores of 

 the petals commence at the outer edge of the internal fasciole, and are formed of large 

 pores which open into transverse grooves separated by great costse. The poriferous 

 zones are in shallow grooves, are broad and straight ; they close the petals externally. 

 The poriferous zones of the antero-lateral ambulacra are shorter than those of the 

 posterior, and those of the same ambulacra are unequal amongst themselves. In the 

 antero-lateral petals it is the anterior zone that is the shortest and which commences 

 furthest from the apical system. In the posterior petals, the anterior poriferous zone is 

 the longest. The petals are moderately broad and long, and angular externally. The 

 posterior petals are rather close and the antero-lateral are wide apart and placed almost 



