300 
Holothvria jJoridana and Holotlmria atra 
EXPLANATION OF PLATES. 
Plate I. Colour variation in the young of H. floridana Pourtal^s (112 — 93) and of the adult (160 — 156) 
and young (166 — 167) of II. atra Jiiger. The amhulacral appendages (pedicels and papillae) and 
the regions of the body are represented in a diagrammatic form for each individual of the 
statistical series as numbered in the column to the left. The appendages under D are dorsal and 
under V, ventral. The stalk and usually expanded terminal end of each appendage and the 
various regions of the surface of the body show the average colouration and its distribution for the 
respective parts. The colours, "browns," "creams," "grays," black and white, are given as 
they occur in dots, spots and blotches upon the general background, or else as uniform for the 
whole body, or its different regions. The plate does not always give exactly the colour effects of 
the original water-colours as described in the text. The predominant tint in 160 — 167 is seal- 
brown rather than violet-brown. The violet tone also has modified the grays and creams in 
112 — 93. In 112, 92, and the ventral region of 91, the tint should be clove-brown. 
Pi,.vTE II. Colour variation in the adult of Hololhitria floridana Pourtal6s. General explanation as 
given for Plate I. The original colours resemble those in Plate I as qualified in the above explana- 
tion. The colour values are not fully reproduced in the half-tone for the dark shades are browns 
that range from seal, Vandyke, sepia, and other tints, to clove-brown and black instead of having 
the uniformity represented. 
Plate III. Papilla, pedicel and their calcareous spicules. 
Figs. 10, 11, 13, 17—22 from H. floridana ; 1—9, 12, 14—16 from H. atra. 
Figs. 1, 3, 5—13 dorsal ; 2, 4, 14 — 22 ventral. 
Figs. 1—9, x 55A ; 10—22, x 260. 
Fig. 1. Papilla with supporting rods and type E end-plate. 
Fig. 2. Pedicel with supporting rods, sucker, and type A end-plate in profile. 
Fig. 3. Type A, end-plate. 
Fig. 4. Type A end-plate with larger holes toward the centre. 
Fig. 5. Type B eud-plate. 
Fig. 6. Type C end-plate. 
Fig. 7. Type C end-plate with larger, irregular holes. 
Fig. 8. Type D end-plate. 
Fig. 9. Type E end-plate. 
Figs. 10 — 12. Variation types of dorsal supporting rods. 
Fig. 10. Nearly straight with ends spinous. 
Fig. 11. Arcuate with spinous ends branched. 
Fig. 12. Expanded ends spinous, branched and perforated. 
Fig. 13. Rare dorsal supporting rosette. 
Fig. 14. Ventral supporting plate. 
Figs. 1.5, 16. Ventral supporting rosettes with broadly branched perforated ends. 
Figs. 17 — 22. Series of ventral supporting rods, nearly straight with more or less expanded, branched 
and perforated ends (Figs. 20 — 22) leading through connecting links (Figs. 18, 19) to the perforated 
plate (Fig. 17) characteristic of the body-wall. 
Plate IV. Calcareous spicules of the body-wall ; their form, size, development and variation. 
Figs. 28—45, 47, 49, 50, 53, 55—60, 62—66, 68—70, 73, from H. floridana; 23— 27 f., 46, 48, 51, 52, 
54, 61, 67, 71, 72, 74, from H. atra. 
Figs. 24, 28—36, 38, 42—45, 47—51, 53—66, 68—70, 73, dorsal; 23, 25—27 f., 37, 39—41, 46, 52, 
67, 71, 72, 74, ventral. All figures x 260. 
Figs. 23—26 rosettes ; 26—27 f. rosettes with holes and perforated plates of H. atra. 
Figs. 28 — 33, 35 rosettes and developmental stages of perforated plates ; 34, 36 — 41 perforated plates 
of //. floridana ; 37, developmental Type a ; 38, developmental Type h ; 38a, Type h, incomplete 
