ADDENDA ET CORRIGENDA. 133 



almost all Cretaceous Asteroids, and in (|uitc young forms of the order " Crypto- 

 zonia," the margin of the disc and arms is l)ordered by specially prominent ])lates 

 — the " Marginalia." The abactinal series are called " Su[)ero-marginalia," ami the 

 actinal series the " Infero-marginalia." 



Prirmirij Inlcr-md'udvi. — See Ceiitrah'. 



liadiuliti. — The abactinal series of plates along a uiajnr radius are called the 

 radialia. 



Rddins. — A line drawn from the central point of the disc to an extremity of 

 the arm is called the " Majur railing," R. A line drawn from the central point of 

 the disc to a point half-way between two radii is called the " Minor radius" r. 

 This is sometimes called an " Ihter-radins." 



Spiiie-pils. — Depressions in a plate for the articulation of spines (see p. 113). 



Ventro-1 ate r alia . — The plates on the actinal surfaL'c uf the Asteroid excluding 

 the infero-marginalia and the adanil)iilacralia. In lln' inter-radial regions these 

 plates are often rliomboidal. A typical view of an isulateil plate of this descrip- 

 tion is given (PI. XXIN, tig. I). 



ADDENDA ET COmUOENDA. 



Page 24, line 19, for Schiihe read G. F. Schulze. 



Rage 2G, Localitij, etc., for Upper White Chalk near Norwich read llnni Clinlk, 

 Wed Norfolk, the precise localitij unknown. 



Page G7, line 11, for Goniaster compactus read Gouiaster (Goniodiscns) coiiipactii.-<, 

 and omit all reference to Forbes, 18-i8. 



Page G9, line 15, for Stellaster comptoni read Gouiaster {Stella. '<ter) Comptoui. 



Page 71, line -i, for Stellaister eleyaiis read Goniaster (Stellaster) cleijans. 



Page 89, line 8 from end, for Bourijiietiicrinns read UoHnjucticrinus. 



Page 90, last line, for Upper Greensand read Lower Chalk. 



Page 95, line ^{, for Sladen read Forbes. 



Page 95, line 1:3, for (p. 8,9) read (/;. 89, PL XAF, .//.'/• ^)- 



Page 101, line 9 from end, the first reference should read Oniii i;.\, I.innarrk, 

 ISOl. Sijsteme des Animaiuv sans Vertebres, p. 350. Tlic date of the reference 

 given is 181f). 



Page 102, line 12, for iSil read tSIO. 



20 



