28 THE FOSSIL ECHINOIDEA 



canthus, and to diflfer from the last mentioned. The ambulacra are broad, and there 

 are two small railiaries, in vertical series, in the interporiferous zone of one side, and 

 also a very minute third series. The number of pairs of tentaculiferous pores, in rela- 

 tion to an interradial plate, is probably about 10 or 12. The bosses of the interradial 

 plates are vs'ell-developed, surmounted by a small mamelon, with a constricted neck, 

 and rather depressed top, which is perforate. Crenulation is on the groove around the 

 base of the mamelon. There is a row of small tubercles, about 16 in number, around 

 the scrobicular circle, which is barely sunken, and beyond there are numerous smaller 

 rounded tubercles, gradually diminishing to the size of miliaries close to the sutural 

 edges. The scrobicules are separated from the upper and lower sutural edges by the 

 single row of larger tubercles. 



The locality of this species is in the Eanikot series, north by east of Petiani. 

 Survey-number G yfy. 



Illustrations of the Species in Plate V. 



Fig. 11. Phyllacanthus Sindensis, a portion of the test : natural size. 

 12. A plate : magnified. 



Were there any pits within the scrobicular circles of these specimens, their alliance 

 with the genus Porocidaris would of course be certain ; but there are none. 



3. Phyllacanthus, sp. Plate V, Figs. 4, 5. 



A very much worn specimen from the Eanikot series shows very indistinct remains 

 of furrows close to the scrobicular circle, and converging towards the base of the boss. 

 The ambulacra are moderately broad, the pores are conjugate, and the boss is crenulate 

 at its groove around the small perforate mamelon. The scrobicule is moderately 

 sunken, and is surrounded by a row of small secondaries, and beyond it are many irre- 

 gularly placed and smaller rounded miliaries. It is impossible to determine the 

 species, and, indeed, there may be some doubt about the genus, for so many of the 

 Eanikot fossils are slightly sand-scrubbed, and it is amongst the number. 



Locality. Eanikot series, north by east of Petiani. Survey-number G yf f . 



Illustrations of the Species in Plate V. 



Fig. 4. Phyllacanthus, sp., a part of the test : natural size. 

 5. A plate: magnified. 



Family SALENIAB^, Desor. 



Genus SALENIA, Agassiz. 



Small swollen Urchins with a small peristome, barely marked with cuts. The 

 ambulacra are flexuous, and composed of narrow, simple poriferous plates, ornamented 

 only with small, closely placed granules. The interambulacral tubercles are very large, 

 crenulate and imperforate. The apical disk is compact and has an undulating 



