MOLLUSC A 281 



(2) Pliilonesia baldivini Ancey. 



Microcystis baldwini Ancey, Bull. Soc. Malac. France, vi. (1889), p. 204. 

 Plate XII. figs. 1—5. 



Hab. 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. i a) 

 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. 2a); 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 



30 : 9 : I : 9 : 30 



39 : I : 39- 



" 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 Kaliella 

 barrakpurensis^ ; those of Sitala attegia and 5. infiila" 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 Kaliella in a few of the outermost laterals, but it 



' Land and F. W . Moll. India, i. pp. 19, 20, pi. v. fig. 11. 

 • Tom. cit. pi. VIII. figs. I (? & 2 £-, after Stoliczka. 



37—2 



