68 University of Texas Bulletin 



giccras to the Pronoritcs, then to the Sicanites and at last to the Med- 

 licottia stage. 



In 1904, Noetling^ showed that Karpinsky's group of M. Wynnei 

 cannot be regarded as a simple group of Medlicottia, but that it has 

 to be considered as a different genus, to which he gave the name of 

 Episagcceras, and in which he included a species M. Dalailamae de- 

 scribed by Diener and considered by him as being of Triassic age, 

 while Noetling regards it as Permian; and a new species, Episageceras 

 latidorsatnm, from the lower Triassic of the Salt Range. Noetling 

 also indicates that Medlicottia artiensis Gruenewaldt differs essen- 

 tially from the real Medlicottia, which resemble the type species M. 

 priuias Waag., on account of its sculpture as well as the form of the 

 suture. Medlicottia Schopcni Gemm. should be entirely separated from 

 the genus, according to Karpinsky as well as Noetling. 



So Noetling would regard as belonging to Medlicottia only the fol- 

 lowing species: 



Medlicottia primas Waag. 

 Medlicottia Orbignyana Vern. 

 Medlicottia iifrons Gemm. 

 Medlicottia Marcoui Gemm. 

 Medlicottia Trautsclioldi Gemm. 

 Noetling gives a very detailed diagnosis of the genus Medlicottia 

 (including only the six species mentioned above) which we do not 

 reproduce here. The most important characters are the following: 

 Shell discoidal, very involute, flattened on the flanks, narrow venter 

 with two lateral keels and a deep median furrow, sometimes crossed 

 by numerous transverse plications. Umbilicus very small in the adult 

 specimens, but wider in the younger whorls. Sculpture consisting 

 apparently only of sigmoidal lines of growth. 



The suture consists of a very narrow, deep, bifid or trifid siphonal 

 lobe, with parallel sides, a series (up to twelve) of rudimentary ad- 

 ventive lobes, an adventive lobe, two lateral lobes and up to ten aux- 

 iliary lobes. All the lobes are bifid with exception of the rudimentary 

 adventive lobes and the last auxiliary lobes which are pointed or 

 rounded. 



There is an external saddle divided into two unequal parts by the 

 adventive lobe. The part nearest to the sipho is high, narrow and 



'Fr. Noetling, Medlioottia u. Episageceras. 



