86 PLACOSTYLUS, SOLOMON IS. 



margin arcuate, columellar margin dilated. Columella thickened, 

 white, obliquely folded. Alt. 60, diam. 25 mill. (Mouss.). 



Makito, San Christoval /., Solomon group, on palms (Rietman). 



Bulimus palmarum Mouss., Journ. de Conchy]., 1869, p. 62, pi. 

 4, f. 5. PFR., Monogr., viii, p. 28. Placostylus palmarum Mouss., 

 KOBELT, Conchyl. Cab., p. 41, and var. minor, p. 42, pi. 9, f. 6-9. 



P. palmarum differs from P. macgillivrayi in having the lip 

 strongly reflexed, less thickened within, and in the less developed 

 parietal and columellar folds. It may prove to be a variety of that 

 species. The var. minor of Kobelt differs from palmarum chiefly in 

 the narrower lip, and might as properly, perhaps, be referred to P. 

 macgillivrayi. 



Var. MINOR Kobelt. PI. 36, figs. 33, 34. - 



The shell varies from greenish-yellow with olive streaks to a tawny 

 yellow with chestnut streaks, the spire fleshy or red, in one shell 

 white; a light subsutural band in all. The sculpture consists of 

 growth-wrinkles and an excessively fine, dense spiral striation, obso- 

 lete in places, and some very shallow spiral sulci, rather inconspicu- 

 ous. Whorls fully 5^-, the first often amputated ; the suture not rising 

 at its termination. Aperture bluish-white or livid within, becoming 

 yellowish or brownish within the lip ; peristome flesh-colored or 

 fleshy-brown (in one shell white), the outer lip hardly expanded 

 above, becoming well expanded below, or even narrowly reflexed. 

 Columella brown, with a white callus superposed on the fold; parietal 

 callus a mere transparent film, in adults usually bearing a small, low 

 white tubercle above the columellar fold. 



Length 50, diam. 23, longest axis of aperture 29 mill. 



Length 45, diam. 21, longest axis of aperture 25 mill. 



Besides its smaller size and paler color, this form differs from 

 typical palmarum in the decidedly less reflexed peristome. It differs 

 from P. macgillivrayi in being thinner, without the callous thicken- 

 ing of lip and columella so pronounced in that species. I have 

 seen over twenty specimens in the collections of the Academy, the 

 National Museum and Mr. John Ford, showing it to be reasonably 

 constant. 



Mr. Hedley informs me that Brazier regards it as a dwarf mac- 

 gillivrayi^ and gives the locality Savu, Solomon group. 



