122 PEOF. p. M. Duncan's eeyision oe the 



Peristome small, sunken, polygonal ; braneliial incisions well 

 developed, witli everted edges. 



Perignathic girdle with high ridges and high oblique pro- 

 cesses forming a tall arch. Jaws tall ; foramen large, tall, closed 

 above ; teeth keeled. Buccal membrane with ten plates with 

 tentacles and pedicellarise. Spines short, sharp, cylindrical, taper- 

 ing, longitudinally striated. 



Fossil. Late Tertiary and (?) Miocene : Europe and America, 

 Java. 



Recent. European seas, world-wide; shallow, to 45 fathoms 

 or more. 



G-enus Sph^rechintis, Besor, 1858, Synopsis, p. 134. A. Agassiz, 

 1873, Bevision, p. 451. Rmnann, 1886, Sonder-Aidr. mis d. 

 Sitzungsb. d. Jenaiscli. Oes.fur Med. und Naturw. 



Test moderate or large, globular, spheroidal, or depressed, 

 flat actinally. Coronal plates numerous, low and broad. 



Apical system prominent ; periproct large, plated ; basal plates 

 forming with all or some of the radial plates a rather narrow 

 ring, carrying secondary tubercles and miliaries, those on the 

 plate with the madreporite most numerous. 



Ambulacra straight, wide; pairs of pores in arcs or oblique 

 lines of from four to eight pairs, with small tubercles or gra- 

 nules interposing or separating the series ; pairs poly serial acti- 

 nally ; iiiterporiferous areas with two to six vertical rows of plain 

 imperforate primary tubercles, slightly smaller than or equal to 

 those of the interradia. 



Interradia broad, with from two to twelve vertical rows of 

 primaries plain and imperforate, large, with horizontal rows of 

 secondary tubercles and miliaries. 



Peristome small, decagonal, with deep, long branchial incisions ; 

 buccal membrane with plates, in relation with the ambulacra, and 

 carrying pedicellarise and large tentacles. Perigaathic girdle 

 slender, with low stout ridges and slender processes and a large 

 arch. Spines stout, short, crowded. " G-lobifera " pedicellarise 

 present and large. 



Fossil. Pliocene : Europe. 



Recent. Mediterranean, Canaries, Australia, Mauritius, New 

 Zealand, Japan, and the China seas. 



