28 



small Bpecimen of M. macrospira collected by Mr. D. Boyle at Elora in 

 1880, and presented by bim to the Museum of the Sui-vey. It consists 

 of three or three and a half whorls and has most of the test beautifully 

 presei-ved. When perfect the type of the species figured by Prof Hall 

 must have had one volution more than the larger of the two specimens 

 represented on plate 4. 



Prom the two additional specimens figured, taken in connection with 

 the type, it would appear that the shell must have consisted of about 

 nine ventricose whorls, which increase rather rapidly in breadth in 

 proportion to the total length, which latter may be roughly estimated 

 at rather more than twice the greatest breadth of the body-whorl. The 

 band or spiral carina, though distinct and well marked, is broad, 

 rounded and not very prominent. On the earlier whorls of large 

 individuals the band is obsolete : on the lower whorls of the spire it is 

 subcentral, while on the outer half of the body whorl it is placed above 

 the middle. The later whorls of the spire are more swollen and in- 

 flated below the band than they are above it. The surface markings 

 consist of fine transverse striations, which are insinuated convexly 

 backwards towards and to the band. 



MXJRCHISQNIA SOLUTA. (N. Sp.) 

 Plate 4, figs. 8 and 8a. 



Shell elongated, slender, consisting of a spirally twisted calcareous 

 tube which is nearly circular in transverse section, and which increases 

 very slowly in diameter ; whorls moderately numerous, free, discon- 

 nected and widely separated from the commencement, but very closely 

 and compactly coiled laterally ; last volution and last but one bearing 

 a rounded and rather broad but not very prominent band or keel a 

 little above the middle ; aperture expanded on the columellar side ; 

 surface markings unknown. 



Gait, Eev. Andrew Bell, 1846-50. Hespeler, T. C. Weston, 186Y : 

 one fragment. Elora, D. Boyle, 1880, and J. Townsend, three speci- 

 mens. Durham, J. Townsend : four specimens. 



All the specimens of this peculiar shell that have come under the 

 writer' s notice are casts which are imperfect either at one extremity or at 

 the other. In the laigest and finest example in the Survey collection, 

 which is figured on plate 4 (figure 8), and which has the body whorl 

 and the two preceding volutions preserved,' the diameter of the cast of 

 the shelly tube immediately behind the expansion of the aperture is seven- 

 teen millimetres, and that of its broken termination above, between 



