404 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvin. 



in xertical sections. Tlie rods are often connected ))y stereoplasniic 

 deposits, which oive rise to an appearance of continuous plates in 

 transverse sections (Plate xxiii, tios. i>c and Ikl).'' 



7y2)(i species. — TrocJiopJdcgiiKt tiniiihtnwUoxa (Ireo-ory, Jurassic 

 Fauna of Cutch, p. 180, pi. xxiii, ti<^s. o-io. 



Dhtrihuiion. — Jurassic, Upper Putchuni beds, Kach, India. 



Renuti'l'H. — Greg-orv says: ^'TroclioplJegum is nearer to (JycJolites 

 [than to LeptophyUia\ in which 1 tirst placed it. But the type species 

 of Cydolites is C. elJiptica Lamarck, with which the characteristic 

 species of the genus such as i\ undulata (Goldfuss), C. pohjuiorphd 

 (Goldfuss), and C. dhcoidea (Goldfuss) ag'ree in all essential particulars. 

 The main difference between Trochophlegriiannd. (JycloUtesiiiih'A.imi\\& 

 latter the septa are not subequal. In C. einpflnt, for exam[)le, afterevery 

 four or five e([ual thin sepia, there is one much thicl^er than the rest. 

 This feature is conspicuous 1)oth on the external surface and in thin 

 horizontal s(M-tions. The feature is stated in Edwards and Ilaime's 

 diagnosis of the type species and illustrated in Pratz's figures. It is true 

 that in transverse sections of Trod tophi eg ma an apparent inequality of 

 the septa is produced ])y stereoplasniic union of some lines of tral)ecu- 

 loe; but in all the Indian specimens the septa externally appear sub- 

 equal, as shown on Plate xxxiii, tig. ;3a or 4c. In Cyclolites^ more- 

 over, the calicular fossa is a deep, elongated trench, extending nearly 

 across the corallum, whereas in TrocJiojddegina it is small and circular. 

 The more lamellar aspect of the septa of Cyclollfex is illustrated by 

 Duncan's figures" of the Sind series of corals belonging to this geiuis. 

 The same character separates FrocyeJolltes Freeh, in which the septa 

 are said to develop 'ziemlich schnell zu compaeten lamellen; die Zahl 

 der otien bleil)enden'Poren ist sehr gering und auf die jiingsten Theile 

 der Septa beschninkt."" 



3. Genus CYCLOLITES Lamarck. 



1801. Ci/dolilfs Lamarck, Syst. Aniin. yans Vert., }). 369. 



Origkial generic diagnosis. — "Corallum free, orbicular or elliptical, 

 convex and lamellate above, flattened below, with concentric circular 

 lines. 



"It forms a single lamellate star." 



Type species. — Cyclolites elJipfica Lamai'ck, Hist. Nat. Aniin. sans 

 Vert., II, p. 234. 



The following species are placed in the genus: 



1. Cyclolites numismalis Lamarck. 



2. Cyclolites heinispjlixrica Lamarck. 



3. Cyclolites eUiptica Lamarck. 



« Gregory overlooked tliat Duncan, because of the imperforate septa of these corals, 

 ere(tted a new genus, Zittdofungia, for tlieni. See /AUr/ofmigia, p. 408, of tlie present 

 paper. 



