74 THE FOSSIL ECHINOIDEA 



equal to its length, is open distally, and has a very broad interporiferous zone. The 

 poriferous zones are equal, rather narrow, and the pores are circular in outline or 

 slightly elliptical. The pairs of pores are rather oblique, are crowded near the apex, 

 and much wider apart distally ; and the pores are conjugate. The ambulacrum is 

 broadest midway, and is flush with the test. The antero-lateral ambulacra are shorter 

 than the others, have a tendency to close, are petaloid and broad in the interporiferous 

 zone. They diverge greatly, but are not transverse, and they do not reach to the most 

 swollen part of the side of the test. The posterior ambulacra are rather close, and are 

 narrower than the antero-laterals ; they end very far from the periproct-groove, and more 

 than their own length. The poriferous zones of the ambulacra have a close resemblance. 

 There are 27 pairs of pores in the odd ambulacrum, and 25 in the others. The large 

 interporiferous zones are very characteristic. 



The peristome is beneath the apical disk. 



The periproct is in a decided groove, with a shelving process, which reaches the 

 tumid margin, and is covered at about halfway up the posterior part of the test by a 

 roof-like ridge. The periproct is longitudinal rather than transverse. 



The ornamentation of the test is that of very small tubercles or sunken areolae ; 

 and there is a fair amount of intermediate raised reticulation. 



Length f inch, breadth ^q inch, height -fij inch. 



Locality. Hills east of Lynyan, from gypseous shales, Ranikot series. Survey- 

 number G ft 6*- 



Illustrations of the Species in Plate XV. 

 Fig. 11. The test, side view: natural size. 



12. View from behind : natural size. 



13. Marginal outline, from below. 



14. The apical system: magnified. 



2. Paealampas mince, sp. nov. Plate XVII, Figs. 1-4. 



The test is small, almost hemispherical, stands on a small base beneath the over- 

 hanging tumid margins ; it is as long as broad, and slightly longer than high, broadest 

 midway between the peristome and the posterior margin, slightly truncated posteriorly, 

 and decidedly concave actinally around the peristome. The marginal outline is ellip- 

 tical, and broadest behind. The highest point superiorly is central, and is situated 

 between the posterior ambulacra. The apical system is eccentric in front and on the 

 rounded anterior slope. The peristome is more central than the apical system, and the 

 periproct is high up, circular in outline, and at the top of the posterior truncation, which 

 has a faint groove. 



' The apical system and subequal petaloid ambulacra are small ; there are four 

 generative pores, and a small central madreporic body. The anterior odd ambulacrum, 

 well developed, is nearly closed ; the pores, large and circular in outline, are conjugate ; 

 and the grooves are oblique ; and the interporiferous zone is fairly developed. The 



