TABLE OF CONTENTS. 
Page. 
I. INTRODUCTION 11 
II. METHODS 11 
1 . Soft parts ............... 1 1 
2. Skeleton ............... 12 
3. Spicules 12 
4. Graphic representation ............ 13 
5. Measuring 13 
6. Biometry ............... 16 
7. Nomenclature of the spicules ........... 17 
III. DESCRIPTION OF THE SPECIES COLLECTED BY THE ALBATROSS 19 
Hexactinellida .............. 19 
Hexasterophora .19 
Euplectellidae ............. 20 
Euplectellinae 20 
Holascus 20 
H. edwardsii (Plate 18, figs. 15-26; Plate 19, figs. 1-24; Plate 20, figs. 1-20) 21 
Holascella 29 
II. taraxacum (Plate 21, figs. 1-13; Plate 22, figs. 1-41; Plate 23, figs. 1-3) 29 
H. ancorata (Plate 23, figs. 4-25; Plate 24, figs. 1-9) .... 37 
H. euonyx (Plate 24, figs. 10-17; Plate 25, figs. 1-24) ... 44 
Caulophacidae . 47 
Caulophacus ! 47 
C. schulzei (Plate 7, figs. 20-31; Plate 8, figs. 1-29; Plate 9, figs. 1-33; 
Plate 10, figs. 1-29; Plate 11, figs. 1-17) ... 48 
C A 0 LO P H A C E L L A ............ 64 
C. tenuis (Plate 12, figs. 1-19) ......... 64 
Calycosilva 67 
C. cantharcllus helix (Plate 1, figs. 1-8, 20-24; Plate 2, figs. 3, 7—13, 15; 
Plate 3, figs. 1-5, 8-30; Plate 4, figs. 23, 24; Plate 5, 
figs. 1, 2, 4, 5, 7-9, 11-15, 18-20; Plate 6, figs. 5-21, 24- 
34; Plate 7, figs. 1-10, 12-14, 16, 17) ... 67 
C. cantharcllus simplex (Plate 1, figs. 9-19, 25-29; Plate 2, figs. 1, 2, 4-6, 14, 
16; Plate 3, figs. 6, 7; Plate 4, figs. 21, 22; Plate 5, figs. 
3, 6, 10, 16, 17; Plate 6, figs. 1-4, 22, 23; Plate 7, 
figs. 11, 15, 18) 68 
C. cantharellus megonychia (Plate 4, figs. 1-20; Plate 5, fig. 21; Plate 7, 
fig. 19) 68 
Doubtful caulophacid (Plate 32, figs. 10-12) 92 
Rossellidae 93 
Rossellinae 93 
Bathydorus 94 
B. laevis ............. 94 
B. laevis spinosissimus (Plate 14, figs. 1-32; Plate 15, figs. 1-22; Plate 16, 
figs. 1-24) 94 
Lanuginellinae 103 
Lanugonychia 103 
L. flabclluin (Plate 12, figs. 20-34; Plate 13, figs. 1-28) .... 103 
Acanthascinae ............. 112 
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