OF KACITH AND KATTYWAR. 23 



The dimensions of the Kachh species and Hchinolampas Fraasi are as follows : — 



The height of the species from Kachh is in excess, and it is narrower than Echino- 

 lampas Fraasi. 



The interporiferous zone is broader in the African form, in which, moreover, there 

 is a tendency to closing of the ambulacra. The anterior part of the test slopes 

 diflferently in the two species, and the basal level differs. The alliance is very close, and 

 the species are representative. 



3. EcHiNOLAMPAS Feddbni, Duncan & Sladen. Plate I, Figs. 8-11 ; Plate III, Fig. 2. 



The test is tall, subhelmet-shaped, longer than broad and broader than high ; 

 roundly oval actinally, and rounded at the margins, so that it stands on a smaller area 

 than the ambitus. 



The abactinal surface curves gradually to the apex, which is slightly excentric in 

 front and a little anterior to the highest point of the test. The slope in front is sharp 

 and precipitous, and that behind is more gradual, and the anterior profile is hemi- 

 spherical, with a flatness about the flanks. 



The actinal surface is rounded in front, and more broadly so behind ; is well curved 

 at the sides also. It is tumid anteriorly to the subcentral peristome, faintly projecting 

 and subkeeled between the peristome and the submarginal transverse periproct, and 

 concave on a line with the sides of the peristome. The margins are well rounded 

 and form no sharp angles, and the most dependent portions of the test on which it rests 

 are in front of the peristome and between it and the periproct. 



The apical system is small, and there are four large generative pores and a depres- 

 sion over the position of the fifth. The front pair are closer together than the posterior ; 

 and the madreporiform body is central and large. The ocular plates and pores are very 

 small. 



The ambulacra are subequal in length and breadth ; the interporiferous zones are 

 slightly above the level of the test, except near the apex, where some tumidity of the 

 interradials occurs ; and the poriferous zones, unequal in length in the same ambulacrum, 

 are either very slightly sunken or oblique. The ambulacra reach near to the margin, 

 but are separated from the lowest point of it by a sensible space ; they are widely open, 

 and show only the faintest approach to closure. The poriferous zones at their broadest 

 part are much narrower than the interporiferous areas there, and these last have a 

 faint longitudinal groove. The anterior odd ambulacrum is straight, increases in width 

 to midway to the margin, and then remains of the same dimensions until lower down. 



