114 



SHELLS AND SHELL-FISH. 



without any variation in the order in which each divi- 

 sion respectively stands in regard to affinity, then all 

 the verification that analogies can possibly give, will have 

 been attained. 



Analogies of the Suh-generic Types in the Genus 



VoLUTA. 



Typical Species. 

 V. Neptuni. 

 V. hnperialis. 

 V. Scapha. 

 v. angulata. 



V. magnrfica. 



Analogical Characters. 



fVentricose; egg-shaped; spire7 

 X very short, or none. 3 



Sub-ventricose ; spire more pro- '^ 

 duced ; the body-whorl and >• 

 spire coronated. J 



f Upper angle of the outer lip ad- 7 

 \ vancing up the first spiral whorl. 5 



C Spire with the apex acute, and not \ 

 X papillary. j 



r Columella lip thin and much 

 ■< spread; shell sub-fusiform 

 C spire short. 



'\ 



Genera of the 

 Volutincc Sw. or 

 VoLUTA Lam. 



Cymhiola. 



Harpula. 



Volutilithes. 



Scaphella. 



Four out of the five analogies of this table are so clear 

 and definite, that they scarcely require further illustra- 

 tion. We thus see how impej-ialis represents the bat 

 volutes ; angulata, again, puts on the pointed spire of 

 Volutilithes i while magnifica connects Scaphella with 

 the melons. The analogy between Scapha and Harpula 

 (the heavy tuberculated species of the latter being the 

 true types), although less apparent on a cursory view, 

 is still very remarkable. The strong resemblance which 

 V. Scapha bears to a Stromhus, must, indeed, strike the 

 most casual observer ; but, we confess, it was some time 

 before we discovered the singular character so prevalent 

 in all the HarpulcF, or music volutes, where the outer 

 lip is extended up the first spiral whorl, — a structure so 

 universal among the StrombidcE, or wing-shells, and 

 which is not found in any other group of the volutes. 

 To put this analogy, however, in a clearer light, we shall 

 now compare the types with the great circle of the Zoo- 

 phaga. 



