﻿A NEW SPECIES OF AMPHIDROMUS 



By PAUL BARTSCH 



The United States National Museum recently received nine speci- 

 mens of an undescribed species of Ampliidromus (Xo. 177,911), 

 from Air. G. A. Goss, Waterbury, Conn. The specimens were col- 

 lected by Messrs. Goss and A. D. Dodge on their recent trip to 

 Mount Kin Baloo, Xorth Borneo, at an altitude of 13,000 feet. The 

 species is named in honor of the donor. 



AMPHIDROMUS GOSSI new species 



Specific diagnosis. — Shell sinistral, ovate-conic, imperforate, early 

 whorls flesh-color with a brown tip. later whorls green with yellow 

 axial stripes ; aperture, outer lip, columella, and umbilical region 

 rose-purple. 



Description of the type. — Xuclear whorls one and three-fourths, 

 well rounded, the first half volution dark chestnut-brown, smooth, 

 the rest flesh-colored, showing, when viewed under high magnifica- 

 tion, weak incremental lines and many somewhat triangular papillae 

 the apices of which point forward. Post-nuclear whorls four, pol- 

 ished, marked only by incremental lines and exceedingly fine micro- 

 scopic spiral striations. The coloration is quite complex ; the first 

 two volutions are encircled by a moderately broad, pale greenish- 

 yellow band at the summit and another between the sutures a little 

 anterior to the middle ; in addition to these there are irregular, alter- 

 nating, axial stripes of greenish-yellow and light chestnut-brown, 

 the first fusing with the spiral bands while the latter are interrupted 

 and enclosed by them. On the third whorl the middle spiral band 

 disappears, the yellow coloration becomes more intense (canary 

 yellow), and the brown of the previous whorls gives place to a pale 

 bice green ; on this whorl the yellow axial stripes fork, or split up, 

 on the posterior half between the sutures, the divisions fusing with 

 the narrow spiral band at the summit. The last whorl is marked by 

 irregular yellow and green axial stripes, the green being one and 

 a half times to twice as broad as the yellow ; the yellow axial stripes 

 terminate about half way between the periphery and the umbilical 

 region, leaving a plain green band, which is edged anteriorly by a 

 narrow yellow spiral zone which separates the green from the pur- 

 ple-colored umbilical region. Aperture moderately large, dark rose- 



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