122 THE FOSSIL ECHINOIDEA 



Suhfamily TEMNOPLEUBID^. 



Genus TEMNECITINUS, Forbes, 1852. 



Test spherical or tumidly turban-shaped. Poriferous zones almost straight. Plates 

 of the ambulacral and interambulacral areas with fossettes upon their horizontal 

 sutures. Primary tubercles non-crenulate and imperforate. (Occasionally a crenulate 

 tubercle is seen.) Apical system well developed and regular. Peristome small, sunken, 

 and with very small indentations. 



In a former page (part ii. p. 36) we have remarked at length on various genera of 

 the subfamily Temncypleuridce. Furthermore, from the study of a large series of 

 specimens in various states of preservation obtained from higher beds than those 

 to which the present fragment is assigned, we have been enabled to discuss critically * 

 the group of species referred by d'Archiac and Haime to the genus Temnopleurus. 

 We have there shown that none of the forms described in the ' Animaux fossiles de 

 I'lnde ' belong to Temnopleurus, in that they are deficient in the special sutural pits 

 and the knob-and-socket jointing of the plates, which -have been demonstrated by one 

 of us f to characterize the Temnopleuridce ; in that they possess a peculiar superficial 

 ornamentation on the plates, which does not occur in the true Temnopleuri ; and in 

 that the tubercles are non-crenulate and imperforate, whilst those of Temnopleurus are 

 crenulate and perforate. On the other hand, the Indian species under notice accord 

 in every essential point with the genus Temnechinus of Forbes ; and it is gratifying that 

 the additional material at our disposal has enabled us to confirm the position taken by 

 him. 



1. Temnechinus Eousseaui, d'Archiac, sp. Plate XXII, Figs. 13 & 14. 



Temnopleurus Eousseaui, d'Archiac (1850), Hist, des progres de la Geol. t. iii. p. 257. 



■ , d'Archiac 6( Haime (1853), Beserip. An.foss. de I'Inde, p. 205, pi. xiii, flg. 10. 



There is a single fragmentary test of a small Echinoid in the collection from the 

 Khirthar series which we refer, although with much hesitation, to d'Archiac and 

 Haime's species. The fossil, unfortunately, is in such a weathered and unsatisfactory 

 state that an accurate determination is impossible. All the types of MM. d'Archiac 

 and Haime's species of Temnopleurus in the collection of the Geological Society are also 

 very badly preserved, and it is often impossible to make out the details delineated in 

 the exquisite drawings in the ' Animaux fossiles de I'Inde.' It appears to us that the 

 imagination of the artist has been guided by ink-spots placed in the cavities and other 

 marks. 



The following are the particulars of such detail as can be noted in the fragmentary 

 specimen before us : — 



' The Tertiary Fossil Echinoidea of Kachh and Kattywar ' (1883), p. 54 et seq. 

 P. Martin Duncan, Journ. Linn. Soc, Zool. vol. xvi. p. 343. 



