282 ECHINODERMATA— ECHINOZOA phylum iv 



Stirechinus Desor. Both areas with two rows of large, plain, primary 

 tubercles situated on raised keel-like projections. Pliocene ; Europe. 



Glyptechimis de Loriol. Cretaceous. Tripneustes Agassiz. • Miocene and 

 Eecent. 



Hypeclunus Desor. Tertiary. Tozopneustes Agassiz. Recent. Boletia 

 Desor. Recent. 



Family 2. Temnopleuridae Desor. 



Ambitus circular. Pits, or sculpturing in coronal plates dorsalhj. Amhulacral 

 plates at the mid-zone composed of three elements each. Oculars usually all exsert. 

 Cretaceous to Recent. 



Glyphocyphus Haime. Test small, depressed spheroidal. Amh narrow, 

 straight, with two vertical rows of small, perforate, crenulate, primary 

 tubercles, and numerous miliaries. I Amh broad, with two rows of primaries 

 somewhat larger than those of the Amh. Transverse and median sutures 

 grooved. Oculars all insert. Cretaceous and Eocene. 



Dictyopleurus Duncan and Sladen. Eocene ; Asia, Europe and Egypt. 

 Paradoxechinus Laube. Miocene ; Australia. Echinocyphus Cotteau, and Zeuglo- 

 pleurus Gregory. Cretaceous ; Europe. 



Temnopleurus Ag. Transverse sutures of all plates grooved and pitted. 

 Apical system small, compact, slightly projecting. Tertiary and Recent. 



Temnechinus Forbes. Test small, subglobose, depressed abactinally. 

 Both areas with two vertical rows of plain primaries. Apical system 

 prominent, compact, the sutures between the plates more or less grooved. 

 Late Tertiary and Recent. 



Salmacis Ag. Eocene, Pliocene and Recent. Alicrocyphus, Amhlyjmeustes, 

 and Holopneusfes Agassiz. Recent. 



Family 3. Strongylocentrotidae Gregory. 



Amhitus circular. No pits or sculpturing in the coronal plates. Amhulacral 

 plates at the mid-zone composed of from four to ten elements each, rarely (some 

 Echinostrephus) of three elements each. Ocidars all exsert or hecoming insert in the 

 sequence I, V, IV, II. Tertiary to Recent. 



^-=_,,_^___ r— , Strongylocentrotus Brandt (Figs. 371, E ; 372-3, 



'^T^s^^j^) ^ — -\ ^v, 396). Test symmetrical and polyporous. ^-^//ift straight, 



broad at the ambitus and peristome, and with broad 



poriferous areas. Pore-pairs in oblique arcs or almost 



transverse series of from four to ten pairs, and crowded 



actinally. Interporiferous areas Avith two vertical 



Fiu. 396. rows of plain imperforate primary tubercles; secondaries 



strongylocentrotus drobach- and miliaries also present. lAmb with two rows of 



Jound Sm?) piate""*''^^' ^°'"' Primary, and four or more of secondary tubercles. 



Late Tertiary and Recent. 

 Sphaerechinus Desoi\ Amh straight, wide. Pore-pairs in arcs or oblique 

 lines of four to eight pairs, polyserial actinally. Interporiferous areas with 

 two to six vertical rows of plain, imperforate primaries, and horizontal rows 

 of secondary tubercles and miliaries. lAmh with two to twelve vertical rows 

 of primaries. Pliocene and Recent. 



Eurypueustes and Aeolopneustes Duncan and Sladen. Eocene ; Asia. 



