154 AMERICAN JOURNAL 



columella callous, slightly reflexed, -white ; peristome thin, sim- 

 ple, acute. Yellowish above and encircled by a single reddish 

 brown band, base of a pale greenish color. 



Remarks. — The above species is of the type inhabiting Pit- 

 cairn's Island, which has not been known before from any other 

 part of Polynesia. 



Helix congrua, Pse. Plate 12, figs. 3, 4. 



Description. — T. elevato interclum deprdsso-conica, solida, 

 crassa, anguste umbilicata, longitudinaliter tenuiter striata ; 

 spira obtusa ; anfr. 6-7, planulato-convexis, ultimo ad periphe- 

 riam acute angulato, basi planulato vel subconcavo ; sutura vix 

 impressa ; labro incrassato, apertura angulato lunaris ; omnino 

 straminea, aut fascia lata unica rufescente-fusca cingulata. 



Dimensions. — Diam. 9, alt. 10 mill, aut. diam. 11, alt. 8 mill. 



Hab. — Insl. Ponape. 



Shell elevately, sometimes depressly conical, solid, thick, 

 narrowly umbilicate, finely longitudinally striate ; spire obtuse ; 

 whorls 6-7, flatly convex, the last sharply angulate at periphery, 

 base flat or very slightly concave ; suture but faintly impressed ; 

 lip simple, somewhat thickened ; aperture angulately lunate ; 

 color wholly yellow or frequently encircled by a single broad 

 band of reddish brown. 



Reynarhs. — The above species is closely allied to nigritella, 

 Pfr., inhabiting the same Island. The latter is of trochiform 

 shape, base convex, and the type is of a dark reddish brown or 

 black, a variety not uncommon is yellowish, with a reddish brown 

 band following next beneath the suture. The species described 

 above is much more elevated and may be distinguished by the 

 peculiar character of its base, which is plane and even some- 

 times slightly concave. The majority of the specimens are 

 wholly yellow, but it occurs banded with reddish brown and very 

 rarely wholly of light flesh color. The locality given by Dr. 

 Pfeiffer is incorrect. It has only been found at Ponape (Ascen- 

 sion Island) near the Carolines in Western Polynesia. 



Vitrina subviridis, Pse. Plate 12, fig. 5. 



Description. — T. tenuissima, fragilis, pellucida, nitida, laevi- 

 gata, vitrea, suborbicularis, subviridis, spira vix elevata, obtusa ; 

 anfr. 4, planulato-convexis, ultimo late rotundato ; sutura dis- 

 tincta, impressa ; apertura vix obliqua, ovali-rotundata. 



Dimensions. — Diam. 10, alt. 7 mill. 

 Hab. — Insl. Marquesas. 



