BIOLOGY, (ii, A, iii : B, i, a — h.) Echin. 38 
ture ; Mortensen (195) p. 42. — Ambulacra! plates, jaw- 
apparatus, Palaeodiscus ; Spencer (264). — Tubercles, crenela- 
tion and perforation, classificatory value ; Mortensen (195) 
p. 42. — Fascioles, migration and modification*; Bather (18) 
p. 298 : Agassiz (3) p. 179 : de Meijere (57) p. 165, 241. 
Pedicellariae, — origin from radioles ; Haller (11 1a) p. 126. — 
Tetradactylous, origin of ; Mortensen (194). — Origin of globi- 
ferae (p. 33), no Ech. pedicellariae derived from or homologous 
with radioles (p. 39) ; Mortensen (195). — In many spp. ; de 
Meijere (57) passim, main results p. 244-248. — In Toxo- 
pneustes pileolus ; Herdman (120) p. 140. — Podia, giant with 
large disc, their skeleton described, in Micropyga ; de Meijere 
(57) p. 60, 243. 
6. Hydrocoel &c. : — See last entry. 
7, 8. Vacant. 
9. Nervous System : — See n, b, i, a, 9. 
10 y 11. Vacant. 
12. Generative System : — Vide n, f, iii. — Chemical constitu- 
tion of ovum in Strongylocentrotus ; Bertolo (26). 
d. ASTEROID E A. 
1. General Account ; Delage (54) p. 32-63, pis. xi-xvii. 
2-1/. Vacant. 
5. Skeletal Anatomy : — Pedicellariae may in some cases be 
transformed radioles, and in so far are not homologous with 
Ech. pedicellariae ; Mortensen (195) p. 39. 
6-12. Vacant. 
e. OP HI U ROIDEA . 
1. General Account; Delage (54) p. 106-136, pis. xviii-xxv. 
2-1/. Vacant. 
5 k 10. Musculature and arm-skeleton, Ophi.oglypha ; Uexkuell (274). 
6-8. Vacant. 
9. Nervous System : — See ii, b, i, a, 9. 
10. Mesodermal tissues (exc. skeletal): — Vide e, 5. 
11. Vacant. 
12. Vide ii, f, iii. — Gonads in arms of Astroschema ferox ; Koehler 
(143) p. 163. 
f. GRINOIDEA. 
1. General Account: — As type of Pelmatozoa, based on 
Antedon bifida ; Delage (54) p. 339-364, pis. xli-1. — Of 
Class [applicable only to recent forms]; Hamann (112) p. 1415. 
2-1/ . Vacant. 
6. SkolotoU :— Cirrals, syzygies, gonital pinnules in Antedon 
Grieg (107) p. 24. — IBB in a Senonian Isocr.y first discovery in 
the genus ; Jaekel (139) [but see Bigot, 1899]. — Stem, BB., 
and union of Br. in Bathycr. ; Grieg (107) p. 8. — Loboliths, — 
nature and function ; Fric (88) : Structure in Camarocr. ; 
Schuchert (249) : explained by hollow roots of various Crin. y 
perhaps contained gonads ; Jaekel (132). 
6-11. Vacant. 
12. Gonads: — Metacr. ; Sperry (265) : Antedon hir&uta ; Andersson 
(10). 
g. CYSTIDEA. 
1. General Account ; Delage (54) p. 403-405. 
5. Skeletal anatomy : — Plates of subvective groove in Agelacr. 
and Lepidodiscus ; Spencer (264). 
h. BLAST0IDEA. 
General Account ; Delage (54) p. 396-400. 
