TIIE NAUTILUS. 135 



B. armifera and contracta, the shells of many specimens, especially 

 of penlodon, are covered with mucus and dirt, often completely, and 

 frequently forming a somewhat irregular ridge along the middle of 

 the whorls. This is not accidental, but evidently done by the animal 

 on purpose, probably for additional protection against drought. 



DESCRIPTION OF NEW SPECIES OF ACHATINELLIDAE FROM THE 

 HAWAIIAN ISLANDS. 



BY D. D. BALDWIN. 



Partulina cooperi, n. sp. 



Shell dextral, very minutely perforated, rather thin, acuminately 

 ovate conic, apex acute; surface shining, striated with fine growth-lines 

 and under a strong lens exhibiting very close and minute decussating 

 spiral stria?, which extend to the apex. Color light yellowish-brown, 

 sometimes dark reddish-brown, variously banded; the constant charac- 

 ters being a white band at the periphery, a black line traversing the 

 suture, with two white lines one above and one below the suture, all 

 three lines extending to the tip of the apex. Whorls 6, somewhat 

 convex, narrowly margined above, suture well impressed. Aperture 

 oblique, oval, white within. Peristome brown, acute, slightly, thick- 

 ened within, basal and columellar margins narrowly reflexed. Col- 

 umella terminating in a strong, flexuous tubercle, tinged with red- 

 dish-brown. 



Length, 17; diam. 9^ mm. 



Hana, East Maui. 



Named in honor of Mr. G. 0. Cooper of Hana, to whom we are 

 indebted for the discovery of both this and the following species. 



Par tulina fid 'vi cans, n. sp. 



Shell dextral or sinistral, very minutely perforated, rather thin, 

 acuminately ovate conic, apex subacute ; surface shining, marked 

 with delicate incremental striae, nuder a lens exhibiting extremely 

 close, minute decussating spiral stria?; unclear whorls faintly cross- 

 lined. Color very light yellow, or sometimes white with one or two 

 light yellowish transverse lines ; a conspicuous dark band near the 

 apex. Whorls 6, somewhat convex, narrowly margined above ; 



