EXPLANATION OF THE PLATES. 
Puates L.-XII., XIV.-XX., anp XXII-XXXIV.—Collotypic reproductions of photographs 
taken by Mr. Murray (of Messrs. Morgan & Kidd); except where they show the growth- 
form, they are magnifications (x 5) of portions of the surfaces in order to show the finer 
structure of the calicles. 
Puates XIII., XXI., anD XXX V.—Lithographic reproductions from drawings of the specimens, 
by Mr, A. T. Hollick, to illustrate the growth-forms alone, without regard to relative 
sizes ; the approximate reductions in each case are given in the following descriptions. 
PLATE I. 
FIG. 
1 and 2. Upper and lower calicles of P. Society Islands 1; for growth-form, ef. Pl. XIII. fig. 1. 
3 and 4, From specimen d of P. Society Islands 3. 
5. From specimen g of the same ; for growth-form, cf. Pl. X. fig. 5. 
6. »  . Samoa 1; for growth-form, cf. Pl. XIII. fig. 2. 
The » &. Tonga Islands 2; for growth-form, cf, Pl. XIII. fig. 3. 
8. » WL. Tonga Islands 3. 
9.  ,, P. Tonga Islands 4; for growth-form, cf. Pl. XIII. fig. 4. 
PLATE II. 
1. From the top of P. Tonga Islands 5; for growth-form, ef. Pl. XIII. fig. 5. 
2. »  L. Tonga Islands 6; for growth-form, cf. Pl. XIII. fig. 6. 
3. and 4. From the top and bottom respectively of P. Tonga Islands 7. 
5 and 6. » £. Tonga Islands 8; for growth-form, cf. Pl. X. fig. 6. 
7. From P. Tonga Islands 9; for growth-form, cf. Pl. X. fig. 7. 
8. »  L. Tonga Islands 10; 5 4s Pl XT fig: 1. 
9.  ; LL. Fy Islands 7. 
PLATE III. 
1 and 2. From specimen a of P. Fiji Islands 2; for growth-form, cf. Pl. XI. fig. 3. 
3. From specimen 6 of the same. 
ys, iyo ee x 
5. »  P. Fiji Islands 8; for growth-form, cf. Pl. XIII. fig. 7. 
6 and 7. From top and projecting edge of P. Fiji Islands 4; for growth-form, cf. Pl, XIII, 
fig. 8 diagram. 
8. From P. Fiji Islands 6; for growth-form, cf. Pl. XIII. fig. 9. 
9. Top calicles of P. Fiji Islands 7; for growth-form, cf, Pl. XIII. fig. 8 diagram. 
