26 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Doctor Pilsbry, in the Manual of Conchology (p. 144), makes the 

 following statement : 



Basilan. — The Steore Expedition also collected examples of chloris on Basilian 

 Island (figs. 32, 35, 36-3S), where Semper did not find it. They are identical 

 in form with Samboanga shells, hut vary in color as follows: (a) Color of the 

 typical yellow tint, hut rapidly fading to white on the spire (pi. 50, fig. 35). 

 (b) Pale citron or greenish-yellow, the spire white (fig. 37). (c) Similar to 

 color-var. pallidulus, hut with a slightly darker sutural border and no white 

 band, (d) Pure white throughout, color-var. purissimus (fig. 32). (e) Pale 

 yellow or rufous, with oblique reddish-brown streaks on the spire or through- 

 out, the suture narrowly marked with the same, color-var. calista (fig. 36). 

 (/) Brilliant rose-pink, with white subsutural band and darker sutural line to 

 the apex, color-var. rosa (fig. 38). 



From a very careful examination of these shells I am led to be- 

 lieve that a mix-up has occurred in handling collections and that two 

 of the specimens referred to, namely, those represented by figures 35 

 and 37, are true chloris which I am inclined to believe came from 

 Zamboanga, Mindanao. This is all the more probable since Professor 

 Steere's expedition also collected in this place. The other three 

 are sufficiently distinct to merit separation. They belong to the in- 

 flata group. I have listed them under the name Amphidromus 

 calista Pilsbry. 



AMPHIDROMUS SULUENSIS. new species. 



Plate 1, fig. 5 ; plate 11, figs. 5, 7-9 ; plate 12, figs. 7 and 9. 



Shell elongate-ovate, dextral or sinistral, sulphur yellow, with occa- 

 sional, bluish gray varicial streaks. Aperture and peristome white. 

 Whorls rather inflated, appressed at the summit, marked by very 

 fine lines of growth and rather conspicuous varices; sutures moder- 

 ately constricted. Aperture small, broadly oval; outer lip reflected 

 and thickened; inner lip somewhat twisted and reflected over the 

 umbilicus, which is covered in almost all the specimens, broadly ex- 

 panded at its insertion, where it joins the thick parietal callus. 



The type (Cat. No. 99564, U.S.N.M.) and five specimens bear the 

 label " Islands of the Sulu Sea." The type has 6.5 whorls and meas- 

 ures — length, 45.5 mm.; diameter, 23.8 mm. The following speci- 

 mens were examined: 



1 Type. 



