DEXAMTNE TENUICOENIS. 



241 



he therefore described it as wanting. We were only ac- 

 quainted with this species from the description and figure 

 of Rathke, until it was recently sent to us by the Rev. 

 A. M. Norman, who, in company with Mr. Jeffreys, took 

 it between the tide-marks at Lerwick, in the Shetlands. 

 We are, however, much inclined to consider it as only 

 a variety of Montagu's species, and it will be for future 

 observation to determine whether the absence of a small 

 denticle, and other peculiarities noticed above, are of 

 specific importance. 



The accompanying vignette represents a cutter and 

 steamer : the former probably with some naturalist on a 

 dredging expedition. 



