GENEEA AND GEO UPS OF THE ECHINOIDEA. 109 



coronal plates variously and more or less deeply furrowed ; 

 grooves at the angles. 



Peristome moderate, with branchial incisions ; processes of 

 perignathic girdle sleuder and closed above. Teeth keeled. 

 Spines short and slender, (Occasionally a true pit, but not under- 

 mining the test, is seen at a sutural angle, and a crenulate tubercle 

 is very rarely visible.) 



Fossil. Miocene : W. Sind, Kach, Kattywar. Pliocene : Eng- 

 land. Mekran Series : Persian Gulf. 



Becent. Caribbean Sea, Plorida ; Azores; Josephine Bank. 30 

 to 600 fathoms. • 



It has been shown, Duncan & Sladen, Pal. Ind. ser. xiv., Ecb. 

 Kachh &c. p. 64 et seq., that MM. d'Archiac and Haime were 

 misinformed regarding the Nummulitic distribution of the 

 Temnecliini of Sind, and that the forms they described in ' Les 

 Animaux foss. de I'lnde' as Temno'pleuri were Temnechini. The 

 habitat was clearly on a Miocene horizon. 



Grenus ^A.JM.A.ciB,Agassiz,1^4il,Monogr. d'Ech. viv, etfoss.,Freface 

 to Valentin, Anat. du Gen, EcJi. p. 8. Desor, 1858, Synopsis, 

 p. 108. A. Agassiz, 1872-74, Bevision, p. 471. J. Bell, 

 1880, ProG. Zool. Soc. p. 422. Duncan, 1883, Journ. Linn. 

 Soc. vol. xvi. p. 345 ; 1888, Ann. Sf Mag. Wat. Hist. ser. 6, 

 vol. i. p. 109. Ramsay, 1885, Gat. Ech. Austr. Mus. p. 47. 

 Test varying in size and shape, moderate and large, circular 

 or subpentagonal in tumid ambital region, broader than high, 

 subcorneal, globose abactinally, flatfish or tumid actinally. Co- 

 ronal plates numerous, low and broad. 



Apical system moderate or small, the basal plates uniform 

 except that bearing the madreporite, which is the largest, tuber- 

 culate around the ring, excluding or not some of the radial plates ; 

 sutures distinct. Periproctal membrane with small plates, some 

 polygonal and carrying email spiuules and small globiform 

 pedicellarige. 



Ambulacra straight ; poriferous zones broad, with small se- 

 condary tubercles ; pairs of pores biserial in close but decided 

 arcs of triplets, the . middle pair of pores being nearest the 

 ambulacro-interradial suture and in a demi-plate. The plates 

 compound, broad and low, adoral component a large primary, the 

 middle a demi-plate, the aboral a small low primary. Primary 

 tubercles crenulate and imperforate, those of the interporiferous 



