MOLLUSCA 281 
(2) Philonesia baldwint Ancey. 
Microcystis baldwint Ancey, Bull. Soc. Malac. France, vi. (1889), p. 204. 
Plate XII. figs. 1—5. 
Has. Oahu and west part of Maui (Ancey); Head of Panoa Valley, Nuuanu, and 
Honolulu Mts. (Perkins). 
“The animal is brown; spotted and splashed with pure white (Plate XII. fig. 1 @) 
on the integument which covers the branchial chamber and visceral sac, these markings 
shew clearly through the transparent shell and give it a very pretty, mottled ap- 
pearance. The extremity of the foot is truncated; with a mucous gland. In the 
specimen examined the foot (Plate XII. fig. 2) is very much contracted, but there is 
every indication that a small lobe overhangs the mucous gland. The foot, which is 
regularly segmented, has a central area (Plate XII. fig. 2@); the pallial margin appears 
unusually broad, but this is deceptive and due to the extreme lateral contraction under- 
gone; the two grooves above are similarly widened. The mantle edge has a well- 
developed, tongue-like, right shell lobe near the respiratory orifice, with an indistinct, 
narrow, left shell lobe. The right dorsal lobe is black and well developed, the left 
paler and moderately broad. Tentacles black. 
‘Plainly seen through the shell were four embryonic shells, lying one behind the 
other in the uterus, in various stages of development. The enveloping integument is 
transparent and so thin that the small shells, being comparatively heavy bodies, very 
readily break away, and the spermatophore adjacent was not made out. 
“The odontophore has a formula of 
“ The basal plates of the central teeth are quadrate in outline. The central tooth is 
tricuspid, the side cusps basal, blunt; the central point with convex sides. The 
median teeth have a blunt cusp only on the outer basal side, the ninth tooth is a 
narrower basal plate and is intermediate in form, the next eighteen being curved and 
bicuspid ; the most interesting character is seen at this part of the row, for all the 
succeeding and outermost teeth are tricuspid, occasionally with even four points. The 
radula is remarkable for the similarity of the outermost teeth to those of Kalella 
barrakpurensis’; those of Sztala attegia and S. znfula* should also be compared, in 
which latter the pectiniform teeth are seen on the whole length of the row. The 
present shell shows an approach to Aadze//a in a few of the outermost laterals, but it 
* Land and F. W. Moll. India, 1. pp. 19, 20, pl. v. fig. rr. 
* Tom. cit. pl. vir. figs. re & 2¢, after Stoliczka. 
