240 BULLETIN: MUSEUM OF COMPARATIVE ZOÓLOGY. 
An examination of the original specimens of Duncan in the collection of the 
Geological Society of London proved that the specimens collected by Mr. Hill 
at Catadupa are identical with the Diploria erassolamellosu of Duncan, which 
a study of Diploria crassolamellosa, Edwards and Haime, showed to be an 
entirely different species. 
Form, flat, lobed, or subglobose masses. The largest specimen examined 
(from the Institute of Jamaica collection) is 80 mm. long, 64 mm. wide, and 
51 mm thick. The series are very long, narrow, and flexuous ; one series may 
wind around over nearly the entire upper surface of the specimen. The valleys 
are elevated above the collines, — i. e. the depression between the series is 
quite deep, sometimes as much as 2 mm, The width of the series is from .5 
to 1.5 mm.; 1 mm. is a fair average; the distance between the series is from 
1.5 to3 mm, The whole upper extraserial surface of the corallum is covered 
with very fine, low, acute equal coste, with granulations on the edges. There 
are 45 to 48 costs to the centimeter. The septa correspond to the costeo in 
position and number; they are very crowded, are of the same Size, or are 
alternately slightly larger and smaller. Their upper edges but little elevated, 
falling in à convex curve to the bottom of the calicular furrow, which is very 
narrow. — Dissepiments are quite numerous. The columella is lamellar, broken 
here and there by calicinal centres. In longitudinal section it can be seen 
that the inner edges of the septa fuse by processes placed one above the other 
to the columella. 
Localities, According to Duncan, Trout Hall and Upper Clarendon. R. T. 
Hill's collection, Catadupa. A specimen from the Institute of Jamaica is from 
the District of Clarendon, Parish of Clarendon. 
Types. Museum of Comparative Zoology, Harvard University, and Insti- 
tute of Jamaica ; specimens in collection of the Geological Soci ety of London. 
temarks. It is difficult to see how Duncan ever identified this species with 
D. crassolamellosa, as Edwards and Haime state: “Largeur des vallées, 3 
millim. On compte environ 18 cloisons dans la longeur d'un centimótre." ! 
As already noted, the width of the valleys in D. conferticostata is .5 to 1.5 mm., 
and there are 45 to 48 septa to the centimeter. "The species are only ge- 
nerically related, But the Jamaican form is extremely closely related to 
Diploria flewuosissima, d’Achiardi,2 from the Eocene of San Giovanni Ila- 
rione, Italy. In fact they are so near each other that I thought at first the 
Jamaican form must be considered identical with the Italian form. Reuss? 
has published a good figure of D. flexuossissima, and made some critical notes. 
For purposes of comparison the greater part of Reuss's description is quoted : 
“ Die Oberfläche ist mit schmalen und seichten, sehr langen, vielfach gewunde- 
1 Hist. Nat. des Corall., Tom. IT. p. 405, 1857. 
? Corallarj Fossili del Terreno Nummulitico dell’ Alpi Venete, Mem. della Soc. 
Ital. di Sc. Nat., Tom. IV. No. 1, 1808, p. 26, Plate XI. Fig. 4. 
® Denksch. d. Wiener Akad. der Wissensch. (Math.-Wiss.), Bd. XXXIII. p. 11, 
Plate XXXIX. Fig. 1, 1874. 
