234 PARTULA, RAIATEA AND TAHAA. 



received from Hartman. It measures, length 23.7, diam. 13, 

 aperture 12.2 mm., has the shape of radiata, but the tooth 

 within the outer lip is less developed. There is no parietal 

 tooth. The base of the last whorl and a band below the 

 suture, ascending the spire are chestnut, leaving a rather wide 

 pale buff zone. The surface is not quite so dull as in 

 radiata. Whether this form is identical with Garrett's 

 Vairahi microstoma remains uncertain. The discussion be- 

 tween Hartman and Garrett about the identity of Pease's 

 microstoma is academic, since Pease never described the form. 

 It was first described (by accident, and quite unrecognizably) 

 from Hartman 's collection, by H. H. Smith, as cited above. 



According to Garrett, specimens which he regards as hybrids 

 between P. radiata and P. fab a are of common occurrence. 



34. P. LUGUBRIS Pease. PI. 19, figs. 1 to 7. 



The shell is moderately or narrowly umbilicate, ovate, thin, 

 rather dull, finely marked with growth-lines which are more 

 or less distinctly decussated by the spiral lines. Spire 

 straightly conic. Whorls slightly more than 5, moderately 

 convex. Aperture ovate, the lip only slightly or narrowly 

 expanded, a little thickened within, usually flesh-colored, 

 thinner near the upper insertion. Oolumella dilated above, 

 not calloused or nodulous. Parietal wall covered with a very 

 thin transparent glaze, toothless. .Coloration various: 



a. Pale honey yellow or corneous, darkening to brown at 

 the apex, lip white. 



b. Similar, but with a narrow brown periferal band. 



c. Reddish-chestnut throughout, of dark or light shade. 



d. Chestnut, with a narrow or wide median light band . 

 Length 19.5, diam 11 mm. (Specimen from Pease). 

 Length 18, diam. 10.2 mm. (Specimen from Pease). 

 Length 17.2, diam. 9.8 mm. 



Hapai valley, on the west coast of Raiatea ; also the adjacent 

 Vaiau valley, where the form ovalis is found. Terrestrial. 



Partula lugubris PEASE, Proc. Zool. Soc., 1864, p. 672; 

 1871, p. 473. PFEIFFER, Mon. Hel., vi, p. 158. SCHMELTZ, 



