PARTULA, RAIATEA AND TAHAA. 221 



Length 21, diam. 12 mm. 



Var. a. Uniform chestnut-brown ; rare. 



Var. &. Base and sutural band chestnut-brown; somewhat 

 rare. 



Var. c. With a broad, median, chestnut-brown band ; rather 

 rare. 



This species is restricted to Toloa and Hapai valleys on 

 the west coast of Baiatea, where it is abundant on foliage 

 (Garrett). 



Partula imperforata Pease MS., GARRETT, Journ. Acad. Nat, 

 Sci. Phila. ix, 1884, p. 54, pi. 3, f. 53. Partula raiatensis 

 GARRETT (as var. of imperforata), t. c. pp. 54, 55. Partula 

 recta Pease MSS., 1863, not P. recta Pease, 1868. 



"Like all the species, they differ some in size, shape, and 

 some have the spire more abbreviated than others. The type, 

 which inhabits Hapai valley, is nearly always imperforated 

 and may be distinguished from the imperforate formosa by 

 its smaller size, gibbous columella and parietal tooth. Car- 

 penter confused it with dentifera, an allied species confined 

 to the opposite side of the island" (Garrett). 



Garrett 's description, slightly modified, is given above. 

 His figured cotype and two others of the same lot are illus- 

 trated, pi. 20, figs. 13-15. The length varies commonly from 

 19 to 21 mm., diam. usually 11 mm. It differs from P. 

 dentifera by the smaller tooth in the outer lip, by having a 

 more or less distinct oblong callus lump on the columella 

 near its insertion, and a small parietal tooth (sometimes ab- 

 sent) ; the face of the lip is less thickened than in dentifera. 

 It is a less evolved race than dentifera. 



Typical imperforata is confined to Hapai valley. The 

 valley Toloa is inhabited by a weakly individualized local race 

 which has been called raiatensis Garrett (pi. 20, figs. 16, 17) 

 and recta Pse. (in coll. 1863) not P. recta Pse. 1868. Gar- 

 rett writes: "After a careful study of about 2000 specimens 

 of the two species, I have annexed the Toloa with the Hapai 

 shell. The only difference between the two is that raiatensis 

 is usually lighter-colored, seldom imperforate, and the apex is 



