350 REPORT ON ALBATROSS MOLLUSCA — rDALL. 



the oral teutacles of the Lcpetida', or the much smaller lappet of Acnicea. 

 When not feeding or seeking food, these lappets would seem to be ap- 

 plied to the sides of the foot below the epipodium. The oral disk is 

 entire, but is slightly indented in the median line below a farrow run- 

 ning up toward tbe mouth. 



The cephalic tentacles are very stout and large, very elongate, coni- 

 cal, with moderately pointed tips. They are situated above, and not,, 

 as in most Trochidce. on either side of the muzzle. Their inner bases are 

 connate; and there is no inter-tentacular "veil," or any tubercular 

 traces thereof. 



The eyes are large, strongly pigmented, ovoid, and sessile on the 

 outer bases of the tentacles, or perhaps I should say, just by the outer- 

 bases. They are not pedunculated or elevated on pedicels in any of 

 the specimens examined, and I am quite confident that this is not 

 caused by contraction due to alcohol, but is normal to the species. 



Theepipodial apparatus is complicated, and exhibits a certain amount 

 of variation between different individuals in the situation and number 

 of its processes. In the males, it is subjected to a remarkable modifi- 

 cation forsexual purposes. The epipodiumbegius immediately behind the 

 eye and a trifle below it. In the females it is produced into a large 

 broadly linguiform process, half as long as the cephalic tentacles and 

 fringed with close-set, uniform, small, pointed papillae or filaments. 

 This process exists in the males on the left side. The posterior margin 

 then curves in toward the side of the foot; it becomes quite narrow and 

 shows two lateral teutacles of moderate size ; then a vacant space; then 

 at the front end of the operculum two or three filaments, small, but 

 larger than any in the vacant space; then another but larger one ; and 

 finally another, which is behind the middle of the operculum, and is the 

 last on that side. The epipodial line is continued to the end of the 

 foot, the dorsal surface above it being transversely rugose and with a 

 linear median furrow. On the other (right) side we find a small, a 

 large, two subequal small, and another large filament, followed by a 

 slight gap, and then a still larger tentacular process. The flap, which 

 corresponds to the fringed process on the left side, is remarkably modi- 

 fied in the male. 



Behind and close to the right eye is a small tubular, longitudinally 

 striate, cylindrical verge, not exceeding (in alcohol) two millimeters in 

 length. Below it the epipodial flap is enormously produced, and its 

 front edge is rolled upward and backward upon itself, forming a tube 

 into the proximal opening of which the end of the verge may project. 



The flap is rolled so that it makes nearly two layers, and thus a very 

 capable cyliuder, which, when unrolled and released, will immediately 

 coil itself up again. This cylinder is of subequal diameter throughout, 

 and is as long as, and somewhat stouter than, the cephalic tentacles. 

 Externally, near its base, it is nearly smooth ; further out, it is spirally 

 striate j near its extremity, it becomes thicker and rather deeply ex- 



