CHAP. IV. SCAPIIELLA — TYPES OF FORM. 125 



Analogies of the Genus Scaphella. 



sJaphel^i!.. Analogical Characters. 



TT J , ^ (■ Shell very smooth; suture) 

 Lndtdata. ^ enamelled ; spire small. S 



Fusiformis. Sub-ventricose ; spire thick. 

 D ■,, fTip of the spire thick and 7 



Papdlosa. J ^aminiUary j 



? ? 



Inner lip thickened and gib- 

 StrornKMes.l "^1^::^.^^:^'::,^.:^'} Rarlspina. Scapha. 



r Inner lip thickened and gib- 'J 

 1 bous near the spire ; outer ( 

 \ lip angular and prominent f 

 ( alove. 3 



(114.) This is the proper place for remarking a pe- 

 culiarity in Volutilithes costaria, which we have not ob- 

 served in its allies; the apex, although pointed, has one 

 of the volutions thickened, — ?q that, in its own circle, 

 it becomes exactly what papi/Josa is among the Sca- 

 phellce. 



(115.) The peculiarly strong resemblance, however, 

 between Scaphella papillosa and Harpula fulminata, is 

 too remarkable to be termed a simple analogy. This 

 brings us to another peculiarity of the natural system, of 

 which full explanations and numerous proofs have been 

 adduced in our former volumes.* The study of the 

 different classes of the vertebrated animals, however, is 

 quite out of the province of the malacologist, and we 

 cannot suppose that he will assent to so novel a theory, 

 unless it be proved in his own particular walk. We 

 therefore lay before him, as a case in point, the aberrant 

 groups of the Volutins, — namely, Harpula^ Volutilithes, 

 and Scaphella. The series in which we have placed 

 these, commences with Harpula fulminata, and termi- 

 nates with Scaphella papillosa. Is there not sufficient 

 evidence that these two extremes meet.'' and that Sca- 

 phella papillosa is as nearly related to H. fulminata as 

 to Valuta fulgens ? If so, our series forms a circle. 

 Thus, we find the whcle family — as we began with 

 assuming — constitutes one circular group, primarily 



* Geograpliy and Classification of Animals, p. 22G. 



