100 MADREPORARIA. 
82. Porites Sandwich Islands @2, (P. Hawaiensis secunda.) 
[Sandwich Islands, coll. Wilkes Expedition, 1838-42 ; 2 ] 
Syn. Porites compressa Dana, Zooph. (1848) p. 553, pl. liii. figs. 5, 5a, 8. 
1 Porites compressa Quelch, Chall. Rep. xvi. p. 180. 
Description.—The corallum consists of erect sublamellate ridges fusing below almost into 
solid masses, but with their free-growing edges broken up into hatchet-shaped sections and 
lobes (lobed above or lobato-ramose). The lobes are compressed, from 12 to 16 mm. broad, 
sometimes much broader, 12 mm. high, and 7:5-10 mm. thick; not at all clavate. The living 
layer is 4 to 5 em. deep. 
The calicles are 1 mm. in diameter, neatly polygonal, quite shallow, plano-conical, about 
0:25 mm. deep, and septa acute and very thin; corallum firm. 
The clumps are 15 cm. and more across, and 10 em. high. 
From the figure of an enlarged calicle we gather (1) that the septa are also very irregularly 
united together: (2) that some six large interseptal loculi can be traced; (3) that there are 
granular pali at the meeting points of the septa; (4) an obscure central tubercle ; and (5) that 
the flattened surface of the intervening wall has no specially noticeable feature, and is merely 
granular. 
The shallow calicles, with their very thin irregularly fused septa with inconspicuous pali, 
suggest that this coral has a strong family likeness to other Hawaiian forms, viz. P. Sandwich 
Islands 5,6 and 7, Unfortunately no specimens in the National Collection from the locality 
have anything approaching the growth-form described and figured. 
Mr. Quelch proposed to identify the specimen called in this Catalogue Porites Sandwich 
Islands 7 with Dana’s type. While it is quite possible that the calicles were closely similar, it 
seems to me that, as we are compelled to adopt some method of grouping, however uncertain, 
we are in the case of these Sandwich Island Porites obliged to divide them according to growth- 
form. Without transition forms we cannot say that No. 7 (see Pl. XII. fig. 6) could also grow 
like No. 2. The three Porites which the British Museum possess from this locality all show 
very distinct growth-forms. 
83. Porites Sandwich Islands (93. (P. Hawaiensis tertia.) 
[Sandwich Islands, coll. Wilkes Expedition, 1838-42 ; 2 ] 
Syn. Porites lobata Dana, Zooph, (1848) p. 562, pl. lv. figs. 1, la, 6. 
Description.—According to Dana’s figure the corallum rises in smooth columns, fused 
together, and with the tops divided into rounded lobes. The living layer is at least 8 cm. deep, 
but in the text Dana says that it grows in deeply divided glomerate forms, not spheroidal, 
and sometimes rising into broad lamellar lobes or plates. The mass below often consists of 
broad, compressed, coalescing plates, 2°5 to 7°6 cm. thick. 
