Sfi MADREPOKARIA. 



spocinii'ii was fiDin the West Indies and not from the I!ed Sea, and tliat consequently the 

 name clavuria given by Ehienberg could have stood.* I did not adopt the suggestion because 

 my Paris notes led me to believe that Lamarck's type specimen of davaria is a very different 

 kind of coral, certainly as to growth-form (see p. 81). I now, however, recognise that the 

 habit of the specimen, both as to growth and calicle structure, as seen in Klunzinger's jjhoto- 

 graphs, make it nearly certain that it did come from the West Indies. We, unfortunately, 

 kiidW un more of its real locality than we do of that iil' Lamarck '.s type. 



72. Porites West Indies t, 7. (P. Ammcana inccrfcc stdis scptima.) (PI. XVI. fig. 4.) 

 [" Les Mers d'Ami'rique, coll. Lamarck " ; Paris Museum.] 



Desm-iplion. — Tlic corallum rises as a thick stem, aliout 2 cm. in diameter, which forks 

 fiiirly regularly and sharply, at angles oi' al lout 60°, and at from 1 • 5 to 2 cm. apart. The 

 terminiils are about 1*5 cm. long, tapering and flattening. The living layer is at least 5 cm. 

 deep. 



The ealicles are very conspicuous and angular, and aljout 1 mm. in diameter, but not very 

 uniliirm in size. The walls are everywhere raised as a thin, sharp network. At the edges of 

 the walls the septa appear as slight, granular projections, liut lower down at a nearly uniform 

 depth lielow the wall-edges they run out as wedge or tongue-shaped flakes, the tips of which 

 sometimes fuse, but generally swell into pali. The ring of pall is thus separated from the 

 wall by a clear flat-liottomed trough ; and is distinct and conspicuous even to the naked eye. 

 It is often complete, the lateral principals being large. The fossa is large and conspicuous, 

 sometimes with a very minute central tubercle. 



The coral is another of the Paris Porites furcata (No. Z 187 m). A first glance at the 

 figure with its sharp tapering terminals suggests P. West Indies x. 5, but the ealicles are 

 entii'ely different, as indeed is the growth-form also, when closely examined. 



Whether this is one of Lamarck's original furcata or not, it is now impossible to say. 

 The ass<iciation Ijetween the name and the shape of the specimen is (jbvious. 



73. Porites West Indies .'. 8. {P. Amrrirutut incerta- sedis octava.) (PI. XIII. fig. 2.) 



[West Indies, coll. Michelin ; Paris Museum.] 



DescrijAion. — The corallum rises into tliin liranelu!S, of irregular thicknes.ses and sliapes, 

 though chiefly cylindrical. They fork at angles of about 30°, but slowly and not regularly. 



* See for instance Vaughan, Sammlungen des Geol. Reichs. Mu.s. zu Leiden, ser. ii. bd. ii. heft 1 

 (1901) |). 7-t. 



