124 SHELLS AND SHELL-FISH. PART I. 



pillar, its characters are more like those of a volute than 

 a Strombus. One circumstance, however, not noticed by 

 either of these writers, must be here mentioned : the 

 whole shell is covered with a thin coat of shining enamel, 

 as in some of the recent Scaphella, particularly thick 

 at the top of the outer lip. This is always apparent ; 

 while, in old ones, there is also a thick deposition on 

 the upper part of the inner lip, which spreads over all 

 the under side of the body- whorl. This, in fact, is but 

 a slighter developement of that greater thickening of 

 enamel seen in the last shell we spoke of, namely, the 

 Volutilithes rarispina ; and is precisely what might 

 be expected in any type which was to connect it with 

 the genus Scaphella. The absence of plaits on the 

 pillar of this interesting shell (which for the present we 

 shall call Scaphella strombo'ides) will not be at all incon- 

 gruous, because, in the whole of the Volutilithes, these 

 appendages are small, and frequently almost evanescent ; 

 while the detachment of the upper part of the outer 

 lip from the spire plainly shows it is the strombiform 

 type of this genus, as V. rarispina is of the last. 



(112.) Scaphella being thus connected to Volutilithes, 

 we may pass over the two chief types, represented by 

 S. undulata and fusiformis, and recall the reader's 

 attention to the next in the series, namely, Scaphella 

 papillosa, formerly alluded to. Now, there are two 

 other shells which more especially possess this kind of 

 nipple-like apex, and in the same high developement, 

 the Harpula fulminata, and the Voluta fulgetrum : the 

 question, therefore, is, to which of these is it mostly 

 allied? On this point we reply, to the latter by affinity, 

 and to the former by analogy. It thus follows that we 

 have traced the series of the volutes once more up to 

 the typical genus, which we enter again by means of 

 Voluta fulgetrum and magnifica. 



(113.) The four types of Scaphella, which are all 

 we at present know, will thus find their respective ana- 

 logies. 



