196 LUCAPINELLA. 



papillae. The basal margins of the shell are nearly level, not ele- 

 vated at the ends as much as in Megatebenmis, etc. The inside cal- 

 lus-rim of the perforation is not at all truncate posteriorly, as it is 

 in Glyphis, and it further differs from that genus in having the sum- 

 mit rather behind than in front of the middle. The type is " Clypi- 

 della " callomarginata Cpr. of California. 



Adam's figure of the animal of Clypidella (Gen. Rec. Moll., pi. 

 51, fig. 3) was probably drawn from a species of this genus, not from 

 the true Clypidella pmtiila, which has been carefully examined by 

 Dr. Paul Fischer, and found to be entirely different. 



In an alcoholic specimen of L. callomarginata examined by me, 

 the edge of the shell is scarcely covered by the mantle, but slender, 

 rather distant processes extend up over it. The edge of the mantle 

 is thick, finely granulose, its lower edge somewhat iuflexed and 

 papillose. Just under the mantle-edge, and concealed by it, is the 

 row of epipodial papillae, extending all the way around the foot. 

 The. foot itself is fleshy, higher behind, very minutely granulose, 

 somewhat wrinkled, of an oval shape. The rostrum is short ; the 

 tentacles very short and stumpy, eyes on low inconspicuous swell- 

 ings at their outer bases. Dorsal pore with papillose processes. 



Fig. 4 of pi. 61, side view of animal in shell, double natural size. 



Fig. 5 side view of head (the mantle turned upward), showing 

 the short blunt tentacle and the beginning of the epipodial row of 

 papillae. 



Fig. 2 fore part of foot and head, seen from beneath. The 

 broad mantle is seen over the oral disk, and the tentacles on each 

 side of it. 



Fig. 3 enlarged view of the dorsal pore from above, the shell 

 removed. The oval boundary-line corresponds to the outline of the 

 internal callus around the hole in the shell. 



L. CALLOMARGINATA Carpenter. PI. 44, figs. 3, 4, 5 ; pi. 61, figs. 



1-5. 



Shell oblong, a trifle narrower in front, rather depressed, the sub- 

 central summit occupied by a rather large fissure, shaped like the 

 shell and from one-fourth to one-fifth the shell's length. Surface 

 having radiating riblets and concentric growth-laminae, which are 

 elevated into imbricating scales on the ribs ; color gray or white, 

 radiated with black. 



The form is oblong, sides subparallel or somewhat convex. The 

 front slope of the cone is a trifle convex, the lateral slopes straight 



