. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. ZONITES. 99 low the furrows. Tlic breadtli of the animal is vory much f^cator than in most of our species, the head broader, blunter, the eye-peduncles shorter, heavier, and very much more widely set apart. A narrow locomotive disk below. Alon{]j the side of the foot, parallel to the base, arc two furrows, rather darker in color, running upwards towards the tail, and meet- ing on its upper surface, above a mucus pore. The extremity of the tail broad and flattened, spade-like, usually curved at its point when
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. ZONITES. 99 low the furrows. Tlic breadtli of the animal is vory much f^cator than in most of our species, the head broader, blunter, the eye-peduncles shorter, heavier, and very much more widely set apart. A narrow locomotive disk below. Alon{]j the side of the foot, parallel to the base, arc two furrows, rather darker in color, running upwards towards the tail, and meet- ing on its upper surface, above a mucus pore. The extremity of the tail broad and flattened, spade-like, usually curved at its point when the animal is in mo- tion. Tlie animal is more sluo-n-ish and less sensitive CO to the touch than the other species. Its labial ten- Zonites capnodes. tacles are highly developed, being nearly as long as the lower feelers. Meas- urements of an individual in motion : Extreme length of foot 59 mill.; before shell 16 mill.; behind shell 14 mill.; of shell on back 32 mill.; of tentacles 10 mill.; breadth of head 11 mill. I was at first inclined to consider it an unnaturally developed form of fuligi- nosuSf but have since been convinced of its being distinct by large suites of spe- cimens of various stages of growtli. The shell is larger, heavier, less globose; the umbilicus is narrower; the aperture larger, and less rounded; the spire less elevated. The coarse, interrupted revolving lines are present in four out of six specimens before me. The species is very variable, and in its globose form difficult to distinguish from Z. friahilis. It is, however, always much heavier. The globose form is figured (Fig. 20). Jaw as usual in the genus. Lingual membrane broad, with numerous rows of about Qi^o—1—66 teeth. Another membrane has 70 rows of 46—1—46. Centrals long, with a long, slender, median cusp, reaching the base of attachment and bearing a long, slender point projecting beyond it. Side cusps subobsolete, but represented by the cutting points, which are greatly developed, tri
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