— 109 — 



with the numerous plates of the columella incurving in size 

 from before backwards ; though their fineness in front sug- 

 gested, at first, an alliance with Conidoi (Swainson) and Niti- 

 della, two undoubted members of the Colombelladce. 



" ' The lougitudiual dentition, however, settled the ques- 

 tion ; presenting three series of combs, on the short odonto- 

 phore of the mitres (not to be confounded with the lenghtly 

 one of the Fasclolar las) instead of the unarmed rachis and 

 foliated pleural hooks which, I must say, I expected to find, 

 as in the Golumlellce. 



" ' The denticles of the rachidian series are seven, and those 

 of the pleural plates in the present instance seventeen, of 

 which, proceeding from within outwards, the fourth is the 

 largest while the rest gradually diminish in size to the seven- 

 teenth which is very minute. The rachis is therefore similar 

 to that of Miira ejjisoopcdis, but at least the external third of 

 the latter being simple, without armature, is the distinguish- 

 ing feature. 



"' The color of the animal seems to be a deep olive; the 

 tentacula are conical and probably of considerable length when 

 extended in the living state ; the eyes are prominent at the 

 outside of the base, the oral operture is in such a place as to 

 indicate the existence of a retractile proboscis ; the foot is 

 elongated, with a lougitudiual sulcus beneath, tapering from 

 before backwards bifid behind, but diluminated in front ; the 

 syphon is prominent, with an obliquely rolled border lying 

 within that of the mantle which is very thin and doubled up- 

 on itself at an acute angle posteriosly when the body which 

 joins the suture ; and the external male organ occupies the 

 right side of the body, about midway between the two extre- 

 mities of the foot.' 



" Dr. Macdonald intends to publish those observations which 

 are of yery considerable interest, and I only wish that animals 

 o^ Bihajjhiis and of the Dihaplim Vike Conus lately found at 

 Mauritius, could also be obtained and similarly treated so 

 that their place in the system might be accurately determined. 

 " Believe me, my dear Sir David, 

 Tours very truly, 



" Signed ; H. Adams, 

 •' Sir Dayid Barclay, Baronet." 



