SCHIZASTER. 609 



ciole the tubercles .are larger adjoining the petals. The anterior part of the 

 peripetalous fasciole seems to vary considerably in large specimens; we find 

 sometimes two crescent-shaped areas, one above the other, or traces only of 

 the second area. There are also more or less distinct narrow intrapetalous 

 branches of the peripetalous fasciole, extending into the two anterior inter- 

 ainbulacral spaces. The interporiferous space is covered by indistinct mili- 

 aries ; the spines are short, cylindrical, at least those of the abactinal part 

 of the test. The color of the dry tests is violet or grayish-violet. The ante- 

 rior groove is covered by minute miliaries ; the edge of the groove is flanked 

 by distant tubercles, somewhat larger than those of the abactinal part of 

 the test ; the j^hyllodes round the mouth are wanting ; only the two anterior 

 actinal ambulacra form indistinct triangles, formed by the large pores diverg- 

 ing from the actinostome. 



Length Length I)ist. Dist. 



Long. Trans. Ant Pair Post. Pair Mouth Ant. Apical Syst. 



Diain. Diam. Height. Anib. Pet. Amb. Pet. Edge. Ant. Eilge. 



65.5 59. 49.5 23. 18.5 9.2 23. 



60. 53. 43.2 21.4 17. 9. 24. 



52. 49. 40. 21. 15. 7. 20. 



China. 



SCHIZASTER. 



Schizaster Agass., 1836, Prod. 

 (See Part II. p. 363.) 



Schizaster canaliferus 



Echinus lacunosus Linn., 1 758, Syst. Nat. 665. 



! Schizaster canaliferus, Agass., 184 7, C. R Ann. Sc. Nat, VHI. p. 20. 



PL XXIIF. f. is; PL XXXIII. f. 7. 



Outline heart-shaped ; anterior extremity deeply indented at the edge by 

 the broad, deep groove of the odd ambulacrum. The outline of the test. 

 seen from above, is angular, slightly indented in the median anterior lateral 

 ambulacral lines, broadest about opposite the central part of the test. The 

 apical system is posterior, about one third the length of the test from the 

 posterior edge. Seen in profile, the test rises rapidly from the anterior 

 edge, attaining its greatest height at the vertex placed behind the apical 

 system, thence the test curves rapidly to the upper edge of the posterior 

 truncated extremity. The sides of the test are nearly vertical, high, rounded 



