86 MADREPOEARIA. 



specimen was from the West Indies and not from the Red Sea, and that consequently the 

 name clavaria given by Ehrenberg could have stood.* I did not adopt the suggestion because 

 my Paris notes led me to believe that Lamarck's type specimen of clavaria 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 gi-owth and calicle structure, as seen in Klunziager's photo- 

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

 know no more of its real locality than we do of that of Lamarck's type. 



72. Porites West Indies x. 7. (P. Americana incertm sedis scptima.) (PI. XVI. fig. 4.) 

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



Description. — The corallum rises as a thick stem, about 2 cm. in diameter, which forks 

 fairly regularly and sharply, at angles of about 60°, and at from 1*5 to 2 cm. apart. The 

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

 deep. 



The calicles are very conspicuous and angular, and about 1 mm. in diameter, but not very 

 uniform 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, but lower down at a nearly uniform 

 depth below 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 pali is thus separated from the 

 wall by a clear flat-bottomed 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. 6, but the calicles are 

 entirely 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 association between the name and the shape of the specimen is obvious. 



73. Porites West Indies x. 8. {P- Americana ineertcc sedis octava.) (PI. XIII. fig. 2.) 



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



Description. — The corallum rises into thin branches, of irregular thicknesses and shapes, 

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



• See for instance Vaughan, Sammlungen des Geol. Reichs. Mus. zu Leiden, ser. ii. bd. ii. heft 1 

 (1901) p. 74. 



