52 THE TERTIARY FOSSIL ECHINOIDEA 



are to be seen*. An almost exactly corresponding portion is in the collection from the 

 Arenaceous series of Kachh ; but the triple row of small tubercles on one half of an 

 ambulacrum within the non-conjugate poriferous zone is visible. The portion of the 

 test has many resemblances to a part of a Goniocidaris ; but under the unsatisfactory 

 circumstances we leave the form as MM. d'Archiac and Haime placed it. The great 

 characteristic is the height of the test. 



Locality. Arenaceous series near Warsar, north of Jakao. Survey-number C 068. 



Illustrations of the Species in Plate VIII. 



Fig. 7. Part of a test: natural size. 



8. Part of an ambulacrum : magnified. 



Genus GONIOCIDARIS, Desor, 1846. 

 The coronal plates are more numerous than in the other genera of Cidaridse, and 

 the sutures of the plates are sunken, forming deep impressions along the vertical median 

 line and also along the horizontal margins of the plates. Pits exist at the junction of 

 the horizontal and vertical lines. The tubercles are perforate and non-crenulate. The 

 ambulacra are narrow. The spines are cylindrical, and their surface is covered with 

 ascending spines ; they are often flaring and cupped at the extremity. 



V The Arenaceous Miocene Tertiaries of Kachh contain plates and spines of a species 

 of Goniocidaris ; and a closely allied or identical species is found in the white limestone 

 of the Mekran coast. But in this last instance the spines are much larger than in the 

 Kachh deposit. The form approaches Goniocidaris tubaria, Lamk., sp., from the 

 Australian and Tasmanian seas ; and it has the scrobicular circle elliptical and the boss 

 and mamelon not very large. There are about eight primary tubercles, and there are 

 several rows of small miliaries outside the row of secondaries around the scrobicular 

 circle. The interporiferous area has six small tubercles in a transverse row (three on 

 each plate). 



1. GoiTiociDAKis AFFiNis, Buncan & Sladen. Plate VIII, Fig. 9. 



The interambulacral plates are broader than high, and slope up to the slightly 

 sunken scrobicule, which covers much space. The boss is a broad, short, truncated cone, 

 with a groove at its top, at the base of the large perforate mamelon. A row of 

 secondaries surrounds the scrobicule, and is composed of separated tubercles with rather 

 long mamelons, a miliary or a row of three intervening. Beyond this row, towards 

 the median groove, is a second, of smaller tubercles, and it is less defined ; and still nearer 

 the edge of the plate is a row of miliaries, a second existing on the large plates. There is 

 only the row of large secondaries on the upper and lower part of the plate, but on the 

 lower edge there is an ill-defined row of small miliaries also. 



The transverse grooves between the plates are linear, rather deep, and the median 

 is well defined; but the pitting at the angles is very slight. The ambulacra are undu- 



• Op. cit. p. 196, pi. xiii, fig. 2. 



