.defined in the present material than in that of Peluzzari. At any rate both 

 the fossils are lyrate in outline and in most of the essential points, such 

 as the aspect of the area, the surface sculpture and the form of the beak, they 

 are sufficiently resemblant to make the identification quite reasonable. 



This variety differs from S/>. disjitnctus var. siib-arcldaci in possessing a 

 less distinctly triangular, or rather a lineal, area, and a smaller delthyrium 

 there. The hinge-line also is not equal to the maximum breadth of the shell 

 itself in the last mentioned form. 



The outline of the present variety separates it at once from Sp. disjiinctiis 

 var. vcrne2iili, which has some affinity to the former. The latter is much 

 more transverse than the former, with quite well developed pointed alar 

 expansions. 



B) Spirifer disjunetus Sew. cfr. var. gortani Pellizzari. 



PI. XXIV., Fig. 5. 



1902. S_pirifcr vernciiili, Martelli (pars) : — op. cit., figs, i and 2. 

 19 1 3. Spirifer disjunetus vds. gortani, Pellizzari : — loc. cit. 



" La forma in esame si distingue nettamente della a contorno lirato per 

 la globulosita della conchiglia e la grandezza e curvatura dell'apice. L'area 

 e concava, subtriangolare, a limiti natti e salienti, di larghezza pari a 5 volte 

 I'altezza, con apertura triangolare equilatera amplissima ; si presenta sottil- 

 mente striata per lungo e per traverso. L'apice della valva ventrale e molto 

 grande e elevato, cost da dominare dall'alto l'area e l'apice della valva dorsale. 

 II seno ampio fin dall'apice, e meglio delimitate che il lobo. Riporto qui le 

 dimensioni del mio esemplare, e insieme quelle dell'esemplare figurato dal de 

 Verneuil.',' 

 Dimensions : — 



Length. Width (Hinge-line). Thickness. Height of Area. 



22 mm. 22 mm. 18 mm. 9 mm. 



Remarks : — According to the diagnosis of Pellizzari this form is chara- 

 •cterized among other points by having its beak strongly curved. Besides, it 

 is a form very globular in habitus. These two points are not, strictly speaking, 



