PARTULA, TAHITI. 187 



more strigated, as well as exhibiting one to three transverse 

 reddish chestnut bands. The lip is always white, and the, 

 parietal tooth is very seldom 'absent. The inosculation with 

 otakeitana is so complete that it cannot be even separated as 

 a well-marked variety." It was thus described: Partula 

 lignaria Pease in Proc. Zool. Soc. 1864, p. 671. " P. t. ovata, 

 solidiuscula, dextrorsa, anguste umbilicata, sub lente minu- 

 tissime transversim striata, irregulariter longitudinaliter 

 striata; anfr. 5, plano-convexis, sutura impressa; apertura 

 rotunda to-ovata, edentata, labro rotundatim incrassato; cas- 

 taneo-fusco irregulariter longitudinaliter strigata, interdum 

 omnino ruf o-f usca. Long. 18, diam. 10 mill. ' ' 



"Var. &. Fascia unica nigro-fusca cingulata, seu omnino 

 flavide fusca." 



Grarrett's note on this imperfectly differentiated race is 

 given above. The figures are from shells collected by him, 

 showing several color-patterns. In certain examples a more 

 or less conspicuous nodule appears on the face of the colu- 

 mella near its insertion, fig. 4, much as in P. auriculata and 

 nodosa. 



Dr. Mayer found lignaria streaked without spiral bands, 

 and also with one dark peripheral band in Tipaerui valley. 

 All were dextral. In a few there is an additional subsutural 

 band. 



In Hamuta and Pirge Valleys, a form with sutural, peri- 

 pheral and umbilical bands was found, constituting 3 to 4 

 per cent of the Partula taken. It occurred with streaked 

 iignaria. In Pirae, all are sinistral; in Hamuta (between 

 Pirge and Tipaerui) both dextral and sinistral individuals were 

 found. 



11&. P. o. AFFINIS Pease. PI. 25, figs. 5, 6, 9. 



"Shell elongately ovate, rather solid, compressly umbili- 

 <jate, dextral, finely, roughly and irregularly striated lon- 

 gitudinally, transversely very minutely striate, suture im- 

 pressed, sometimes faintly marginated; lip narrowly thick- 

 ened, occasionally connected with the eolumella by a thin 



