230 PARTULA, RAIATEA AND TAHAA. 



nut-brown ; occasionally with a broad yellowish horn-color 

 band ; very rarely yellowish horn-color with a chestnut band. 



Length 18, diam. 12.5 mm. (Pease). 



Tahaa : The metropolis of this well-defined species is in a 

 large valley called Haamene, on the east coast of Tahaa, where 

 they are found in prodigious numbers on the foliage of low 

 bushes. It has not spread any to the southward, but, on the 

 other hand, ranges in considerable numbers through all the 

 valleys, except Faa-apa, the home of bilineata, as far as 

 Murifanna on the northwest coast, where it is found asso- 

 ciated with P. virginea. (Garrett}. 



Partula umbilicata PEASE, Amer. Jour. Conch., ii, 1866, p. 

 200 ; 1867, p. 81, pi. 1, fig. 7 ; Proc. Zool. Soc., 1871, p. 474.- 

 BINNEY, Proc. Acad. Nat. Sci. Phil., 1875, pp. 245, 247, pi. 19, 

 fig. 7 (anatomy). SCHMELTZ, Cat. Mus. Godeff., iv, p. 71. 

 PPEIFFER, Mon. Hel., viii, p. 207. HARTMAN, Cat. Part., p. 

 8 (with woodcut) ; Obs. Gen. Part., Bull. Mus. Comp. Zool., 

 ix, p. 188. GARRETT, Journ. A. N. S. Phila., ix, 1884, p. 61. 



P. umbilicata unites characters of the auriculata and the 

 rustica groups in some degree, though nearer rustica, of which 

 it might be called a very large and obese edition. The outer 

 lip is a little narrower in its upper fourth than in P. thalia, 

 and there is a distinct callus, often dentiform, superposed 

 upon the columella. The parietal tooth varies from small to 

 well developed, and seems to be invariably present. There 

 is often an indistinct appearance of several angles in the out- 

 line of the outer lip, which is moderately expanded, and 

 cream-white behind, white on the face. The whole surface 

 generally shows spiral strias. Umbilicus much wider than 

 in P. thalia. The last whorl is typically well inflated, but 

 I have seen specimens with a strong peripheral angle, from 

 retention of a juvenile character in the adult stage. 



Color various; the commonest pattern before me is chest- 

 nut, fading to yellowish-white below the last suture, gradu- 

 ally shading to purplish-black at the apex ; but sometimes the 

 whole shell is straw-color. In fig. 11 it shows one of the 

 common color-patterns of the faba group. Figs. 13, 14 rep- 



