13IOLOGY. 
Ech. 35 
(4) Dorsal organ of Batkycrinus carpenter* , connected with genital 
rachis (pp. 16 & 17), gonads in pinnules of Batkycrinus carpenteri (pp. 9 
& 18) ; Danielssen (61). 
(5) Sacculi ; Perrier (213) p. 826. 
(6) Colour of Balhycrinus carpenteri ; Danielssen (61) p. 22. For 
colour, see also under, B, ii, c, & D, y, c, 3, 
(g) CYSTIDEA : — General discussion ; Teisseyre (259). 
Relation of Cyslidea to the “ cystid-stage ” of Antedon ; Seeliger 
(241) p. 417. ’ 
(h) BLASTOIDEA : — General discussion ; Teisseyre (259). 
Ambulacra strongly bent in Mesoblastns australis (p. 211), hydrospire 
sacs and large deltoids in Tricoelocrinus obliquatus (p. 213); Etheridge 
(76). 
(ii) Variation. 
(a) In form ; — Doprossed Echinus esculentus ; Scott (238) p. 49. — 
Depressed var. of Echinus esculentus, also one higher than usual, and 
pentagonal in shape through flattening of interambulacra ; Scott (239). — 
Form of cup in Pisocrinus pilula (p. 28), in Cyathocrinus visbycensis 
(p. 131) ; Bather (11). — Outline and size in Granatocrinus mutabilis ; 
Rowley (228) p. 307. — Swelling of arms in Cribrella praestans ; 
Alcock (6) p. 1 12.— Proportional measurements, Asterias torquata ; 
Meissner (179) p. 184, — Variation in size of individual rays congenital 
and not due to regeneration, in Astronyx loveni ; Smith (251). — Length 
of rays in Goniaster pfirygianus ; Scott (238) p. 49. — Arms of Acan- 
thaster echinites (p. 387), Echinaster eridanella (p. 391), Luidia maculaia 
(p. 380), Pentaceropsis obtusatus (p. 381) ; Loriol(154). 
(b) In form and surface characters : — Form or external ornament in 
Echinocyamus affinis, E. subcaudatus, Thagaster wetterlei, Rhabdocidaris 
poueclii , Coelopleurus tournoueri , Echinopsis elegans, Maretia grignonensis, 
Euspatangus croizieri ; Cotteau (44). — Outline, and in size and arrange- 
ment of tubercles in Holectypus planatus ; Clark (36) p. 58. — Supple- 
mentary plates and measurements of Astropecten aster ; Marciiisio (162). 
— Proportions of radii, supero-marginals, spines, and papularia in Pon- 
taster tenuispinis ; Bell (15). — Size and number of supero-marginals in 
Metopaster parlcinsoni (p. 36), and in Mitraster hunteri (p. 62), and M, 
rugatus (p. 66) ; Sladen (248). — Surface characters of Pentaceros turrilus 
(p. 380), measurements and surface characters of Ophiocoma erinaceus 
(p. 410), pedicellariae and spines of Archasler typicus (p. 378), spines of 
Pentaceropsis obtusatus (p. 381); Loriol (154). — Spines in Ophiacantha 
abyssicola ;, Grieg (106) p. 24. — Length and colour of spines in Stron- 
gylocentrotus droebachiensis ; Ganong (91) p. 57; Petersen (216) p. 41. — 
In spicules of Synapta digitata (? senile) ; Marenzeller (164) p. 18. — 
Spicules and colours in Holothurioidea ; Herouard (121) p. 131. — Form 
and colour of Echinus esculentus ; Lindsay (149) p. 347. 
