342 PKOCKEDINGS OF THE MALACOLOGICAL SOCIEXr, 



and more swollen ; the tubercles are, however, very similar in both 

 forms, but smaller and rounder in S. nodi/era. Stefanescu hus 

 recorded the occurrence of Septa Apennhiica (Sassi) and S. Grasi 

 ( Bellardi) in the Tortonian beds of South- Western Roumania (Bahna, 

 Verciorova, etc.), but these species are in no way related to the 

 present shell, being of much smaller size and bearing an entirely 

 different ornamentation. There is no doubt that the horizon of this 

 shell may be given as Tortonian, since a microscopical examination 

 of the matrix discloses the presence of a nullipore structure of the 

 genus Lithothamnium, a marine alga which largely constitutes the so- 

 called ' Leithakalk ' of the Vienna Basin, and which is characteristic 

 of the Tortonian division of the Miocene system. Such Miocene rocks 

 have already been recorded from near Slanic, in the neighbourhood of 

 Bustenari, by Dr. Pilide,' who recognized the occurrence of similar 

 nullipores in the limestone, accompanied by a number of marine shells, 

 thus enabling him to correlate the deposits with the ' Leithakalk ' of 

 Austria. The specimen is of a brownish-black colour, having been 

 found in association with petroleum. 



The generic name of Septa here adopted for this shell was founded 

 by Perry in 1811 (" Conchology, or the Natural History of Shells," 

 pi. xiv, explanation) for a number of species belonging to Cymatium 

 of Bolten and Triton of De Montfort. As De Montfort's Triton was 

 previously occupied by Linnteus for another animal, Dr. W. H. Dall 

 lias selected Septa to take its place, recognizing Septa ruhicunda of 

 Perry as the type, which is said to be equivalent to Triton nodifenun 

 of Lamarck. Septa will also include the second part of Schumacher's 

 Lampusia, of which the type is Murex tritonts, Linnaeus. For fuller 

 information on this subject the student shoiild consult Dr. Dall's 

 pamphlet entitled " An Historical and Systematic Review of the Frog- 

 Shells and Tritons," published August 6th, 1904, in the Smithsonian 

 Miscellaneous Collections, vol. xlvii, Pub. No. 1467, p. 114. 

 Valenciennesia Rotjmaniensis, n.sp. 



Shell orbicular, pileiform, fragile ; apical region posterior, elevated, 

 inflated ; surface depressed beyond the apical area to anterior margin ; 

 sculpture entirely concentric, possessing numerous equidistant, deep 

 sulcations margined hj rounded or bluntly-edged, elevated, regular 

 ridges (about 24), except towards anterior region, where the sulcations 

 are shallower, and the ridges become merged together and less definite. 



Height 58, width 46, convexity of apictd region 12 mm. 



Locality — Near Bustenari, Roumania. 



Formation. — Miocene (Pontian). 



This species is intermediate Ijetween V. Fauli of Hoernes '^ and 

 V. annulata of Reuss.^ From the former it differs in its much smaller 



^ C. D. Pilide, " Ueber das Neo^en-Becken nordlich voa Ploesci (Walachei) : " 



Jahrb. k.k. Geol. Reichs., vol. xxvii (1877), pp. 134, 135. 

 2 Rudolf Hoernes, " Ein Beitrag zur Keutniss der Neogeu- Fauna von Siid-Steier- 



mark und Croatieu-Cougerieu- (Valenciennesien-) Schichteu von Knegiuec " : 



Jahrb. k.k. Geol. Reiclis., vol. xxv (lS7o), p. 72, pi. iii, fig. 1. 

 * A. E. lleuss, " Neue Fundorte von Valenciennesia anntdata" : Sitz. k. Akad. 



Wiss. Wien, vol. Ivii (1868), pp. 92-102, pi. iii, figs. 1-3. 



