20 
CEETACEOUS CORxVLS OE ANTHOZOA 
VIII. Genus. — STYLINA, Lamarck, 1816. 
Hist. Nat, ties Corall., tome ii, p. 23^. 
]Massive, generally semiglobose, rounded or flatly expanded coralla, in wliicli the 
eorallitcs are united by a dense costal or mural theca ; the costae arc well developed ; 
the septa entire, in six systems, the calyces usually deeply excavated, of a rounded 
circumference, with raised edges ; the columella styliform. 
D ’ Orb i guy divided this genus, as defined by Milne -Ed wards in his early 
monograph* of the AsTnmnm, into more than half a dozen distinct genera, 
taking as points of distinction either the form of the corallum or the number of 
well developed systems of septa. These characters the authors of the history of 
corals consider as unreliable for the purpose of forming new genera, and retain the 
unity of the genus Stylina in the form characterized above. This appears a very 
correct view of the facts, for a greater variability, than occurs in the form of the 
corallum, and to a large extent also in the development of the septa, among these 
compound corals, can scarcely be met with. Even the presence or absence of a colu- 
mella is not always absolutely constant, for in some calyces on one and the same 
coraUum I could discover scarcely a trace of a columella, while most of the other 
corallites had it very distinctly developed. Erom this fact it is clear that the genus 
Cyatlwphora is very closely allied to Stijlina, and I dare say instances may occiu' 
where it is impossible to separate both. 
In order to facilitate the determination of the species Milne-Edwards and 
Ilaimc have divided the genus into several groups, chiefly according to the equal 
or unequal development of the systems, and then according to the number of cycles. 
In tbc South Indian cretaceous deposits tlu’ce species have been found, one belongs 
to a group with only very few septa of the fourth cycle, while the two others are 
referable to a section of chiefly Jurassic species with regular six systems and only 
two complete cycles of septa. 
1. Sttlina multistella, Stoliezka. PI. Ill, Pigs. 1 & 2. 
Stijl. corallum subglohosum seu late explanatuin, infra suhpedicellatum cel 
concacum ; calycihus in superjlcie supera irregulariter dispositis, 4 ad 5 mm. latis, 
modlce distantihus atque elecatis, prof unde ac infundihil forme excavatis ; septis 
crassis, inltis attenuatls in duohus cyclis dispositis, crassiorihus atque tenuiorihus 
alternantibus ; columella tenui, profunde sita. 
The form of the corallum is very variable, either semiglobose with a concave 
lower side, or more or less expanded and with a flattened upper side. One ot the 
largest specimens measures 160 mm. in length, 140 in breadth, and aboiit 55 in 
thickness, the lower side being subpedieellate, the upper only very slightly convex. 
( 152 ) 
* Ann. des sc. nat., 3ine ser., vol. x. 
