ERRATA. 



7. 1. 5 read for lumen is " luraina are." 

 9. " 18 " " oval ''oral." 

 12. "32 " " Fig. 5 "Figs. 8, 10 and 11." 

 U. " 20 " " Plate II flg. 2, 3, 5 " Plate II Fig. 3." 

 34. "28 " " Maccoy "M'Coy." 

 47. "22 " " Codastus "Codaster." 

 47. footnote read for ralated " related." 

 49. 1. 10 read for impossible " impossible." 

 51. 1. 13 & 15 read for canedayi " cassedayi." 

 63. " 22 read for ambulacria "ambulacra." * 



55. "18 " " plicable "plicated." 

 55. "35 " " prominent "promising." 

 59. " 18 omit comma 

 Explanation to PI. II. No. 5 add "enlarged four times." 

 " " " " 11 " " in a Codaster." 



** " PI. IV. " 6 read for pyramidalis "bipyramidalis." 



