THE STONY CORALS OF THE PORTO RICAN WATERS. 
319 
EXPLANATION OF PLATES. 
Plate I : 
Figs. 1, la, Paracyathus deflippii Duchassaing&Michelotti. Fig. 1, upright view of corallum; height, 
7 mm. Fig. ia, calicular view ; greater diameter of calice, 6.5 mm. , 
Figs. 2, 2a, Deltocyathus Ualicus (Michelotti) , var. calcar Pourtales. Copied from Lindstrom. [Acti- 
nology of the Atlantic Ocean, pi. i, fig. 13, and pi. ii , fig. 14.] Fig. 2, view of base. 
Fig. 2 a, calicular view. Lindstrom does not give the size of the specimen or indicate 
the magnification of his figures; judging from his text, the diameter is probably 8 mm. 
(exclusive of the horns). 
Figs. 3, 3a, Axhelia mirabilis (Duchassaing & Michelotti) . Fig. 3, general view of a branch ; greatest 
length, 45 mm. Fig. 3a, view of a calice; greater diameter, 2 mm. The surface of the 
coenenchyma is covered with elongate granules, which show a decided tendency to he 
arranged in striae. 
Fig. 4, Axlielia asperula (M.-Edw. & H. ). Several calices enlarged; distance between columellar 
styles of the two calices farthest apart, 2.5 mm. ; figure enlarged 8 times. The septal 
margins are exsert and on the tips of the branches the calicular margins are fre- 
quently considerably elevated. 
Figs. 5, 5 a, Oculina diffusa Lam., var. Fig. 5, general view of a branch; greatest length, 70 mm. 
Fig. 5a, calicular view of a corallite; greater diameter, 3 mm. 
Figs. 6, 6a, 6 b, Astrangia solitaria (Le Sueur)? var. portoricemis var. nov. Fig. 6, upright view of 
a single corallite; height, 13.5 mm. Fig. 6a, costge and exsert portion of several septa 
enlarged. Fig. 66, calicular view; greater diameter of calice, 7 mm. 
Figs. 7, 7a, 76, “FHaseris” crispa Pourtales. Fig. 7, upright view of corallum; diameter, 9 mm. 
Fig. 7 a, 1] systems of septa, seen from above, enlarged; the Arabic figures 1 and 2 
denote septa of the first and second cycles, respectively. Fig. 76, view of the base. 
Plate II: 
Figs. 1, la, 16, le, Oyathoceras portoricemis, sp. nov. Fig. 1, upright view of corallum; height, 22 mm. 
Fig. la, calicular view; greater diameter, 10 mm. Fig. 16, profile of a large septum. 
Fig. lc, costae and exsert portions of several septa enlarged. 
Figs. 2, 2a, 26, Aslrangia astreiformis M.-Edw. & H. Fig. 2, general view of a corallum; greatest 
distance across, 21.5 mm.; calicular view of a corallite; greater diameter, 5 mm. 
Fig. 26, costae enlarged; the costae usually are more granulate and the septal margins 
are alternately more and less exsert. 
Figs. 3, 3a, Cladocora arbuscula (Le Sueur). Fig. 3, general view of a portion of a corallum; 
greatest length, 33.5 mm. Fig. 3a, calicular view of a corallite; greater diameter of 
calice, 3.5 mm. (of corallite 4.5 mm.). 
Figs. 4, 4a, 46, Porites porites forma divaricata. Le Sueur. Fig. 4, general view of a corallum; greatest 
length, 39 mm. Fig. 4a, two calices enlarged, distance across the two, 4 mm. ; the letter 
. a corresponds to letter a in fig. 46; this calice possesses 5 pali and no columellar 
tubercle; the septal arrangement and the mode of occurrence of pali are diagram- 
matically represented by fig. 46; the other calice possesses 5 pali and a columellar 
tubercle; between the pali and the wall on several septa are prominent septal granules, 
so it is not easy to distinguish the pali and columellar tubercle in the figure; the 
septal arrangement is the same in both calices. 
Plate III: Meandrina mseandntes (Linn. ) ? Young. View from above; greatest length, 79 mm. 
Plate IV : 
Fig. 1, Meandrina rnseandrites (Linn.) ? Young. Upright view of corallum; greatest length, 79 mm. 
Figs. 2, 3, Manicina areolata ( Linn. ) . Fig. 2, calicular view. Fig. 3, upright view ; greatest transverse 
measurement, 57 mm, 
Plate Y: Meandrina danse (M.-Edw. & H.). Figures from photographs of the types' in the Museum 
d’Histoire Naturelle, Paris. 
Plate VI: Orbicella acropora (Linn.) var. General view of a corallum; 18.7 cm. high. 
Plate VII: Orbicell acropora (Linn.) var. Calices enlarged; usual diameter of calices about 4.5 mm. ; 
enlarged about 5 times. 
Plate VIII: Favia fra, gum (Esper). Lower figure, view of a corallum from side; upper figure, view 
from above, more enlarged; greater transverse diameter of specimen, 2.85 cm. 
Plate IX: Platygyra viridis (Le Sueur). General view of a large head; height, 35 cm. 
Plate X: Platygyra viridis (Le Sueur). Valleys enlarged. 
Plate XI: Platygyra viridis (Le Sueur). Portion of valleys represented by pi. x more highly enlarged. 
Plate XII: Platygyra viridis (Le Sueur). Meandiiform valleys enlarged. 
Plate XIII: Platygyra viridis (Le Sueur). Portion of the valleys represented by pi. xn more highly 
magnified. 
