40 Echin. 
XIV. ECHINODERMA. 
Ludwig (210) pp. 84, 104. — Of Plutonaster subinermis (p. 116), of Penta- 
gonaster 'placenta (p. 178), of Marginaster capreensis (p. 206), of Asterina 
gibbosa (p. 241), of Palmipes membranaceus (p. 266), of P. lobianci (p. 270), 
of Ophidiaster ophidianus (p. 313), of Echinaster sepositus (p. 343); Ludwig 
(210). — Sexual differences in genital organs, esp. in Asterias rugispina ; 
Leipoldt (186). 
(e) OPIIIUROIDEA. 
(1) General accounts: — with ref. to fossils in British Museum; 
Gregory (112) p. 97. — With special reference to fossils; Zittel (356) and 
Zittel-Eastman (357). 
(5) Skeleton: — general discussion; Haeckel (116) p. 491. — Madre- 
porite of Eucladia and other palaeozoic Oph . (p. 1041); “Syngnath,” nom. 
nov., “ the united piece formed of mouth-frame and jaw, Mundeckstuck ” 
(p. 1032) ; structure of arm-skeleton, especially in Palaeozoic Oph. (p. 1029); 
ventral arm-plates absent from Furcaster (pace Stlirtz) (p. 1038) ; Gregory 
(111). 
(6) Ambulacral system : — Haeckel (116) p. 493. — Migration of 
hydropore in phylogeny; Gregory (111) p. 1041. 
(8) Gut : — H aeckel (116) p. 493. 
(12) Genital system : — Haeckel (116) p. 494. 
(f) OR I NO IDEA. 
^1) General accounts : — with special reference to fossil specimens in 
British Museum; Bather (28) p. 98. — With special reference to fossils; 
Zittel (356) and Zittel-Eastman (357). — With tabular synopsis of Meso- 
zoic and Palaeozoic genera; Koken (171) p. 273. 
(2) Base, orientation of small unfused plate ; Wachsmuth & Springer 
( 336) p. 153. 
(5) Skeleton: — general discussion ; Haeckel (116) p. 465. — Morphologi- 
cal classification of skeletal elements (p. 38), Primary plates, abactinal (p. 38), 
actinal (p. 88), Supplementary plates (p. 105), Their value in classification 
(p. 154), anals (p. 124); terminology of skeletal elements (pp. 32-37); 
Wachsmuth & Springer (336).— Skeletal elements of Uintacrinus de- 
scribed, specially arrangement of pinnules and syzygies, fixed pinnules, 
interbrachials, interdistichals, and interpinnulars, and structure of arms; 
Bather (24). — Pores in test of Crinoids compared with pore-rhombs of 
Cystidea; Haeckel (118) p. 22. — Base, mono- or di-cyclic, value in classi- 
fication (p. 154) ; Basals and infra-basals (p. 52), law of W. & Sp. (p. 59) ; 
Badials, term restricted, compound RR discussed (pp. 68-73), value of the 
latter in classification (p. 154) ; Orals and their homologies (pp. 88-99), 
value in classification (p. 155) ; Arms, term defined, free and fixed, termino- 
logy of brachials, types of branching (pp. 73-88); Wachsmuth & Springier 
(336). — Arm-branching in Taxocrinidce ; Jaekel (144) p. 45. — Pinnules, 
value in classification (p. 155), their origin discussed (p. 160); primibraclis 
or costals, value in classification (p. 154); ambulacrals of arms and 
tegmen (p. 100); food-grooves and ambulacrals, value in classification 
(p. 155); Interradials, interbrachials, and interambulacrals, structure of 
tegmen (pp. 105-124), value of tegmen in classification (p. 154); anals 
and anal tube (pp. 124-139) ; pores in anal tube of Fistulata maintained 
(p. 114, pi. vii); Wachsmuth & Springer (336). — Summit-plates of anal 
tube of Callicrinus , sub nom. Cryptodiscus ; Weller (339 & 340). — Stem, 
and appendages (pp. 38-52) ; value in classification (p. 155) ; Wachsmuth & 
Springer (336). — Structure, and gradual loss of; Bather (26) p. 298. — 
Convoluted organ of Palceozoic Grin. ; Wachsmuth & Springer (336) 
p. 142. 
