344 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



about twice as wide as that on the spire. In addition to this, the 

 whorls are vermiculated by diaphanous zigzag lines on both the upper 

 and lower surfaces. On the lower surface this element seems confined 

 between the peripheral and median basal dark zones. The peristome 

 is white. The dark bands show on the inside of the outer lip. Nu- 

 clear whorls 1.3, marked by fine lines of growth and microscopic spiral 

 striations. The postnuclear whorls are slightly rounded and marked 

 by rather coarse incremental lines and microscopic spiral striations. 

 Both of these elements extend upon the base. In addition to this, 

 the anterior half of the whorls between summit and suture and the 

 equivalent basal portion are rather strongly malleated. The succeed- 

 ing turns fall below the keeled periphery of the preceding turn, but 

 in such a way as to form an almost continuous slope. The aperture 

 is oval. The peristome is somewhat inbent on the posterior half, 

 while that of the inner lip is expanded and reflected and on the parietal 

 wall covers about one-third of the umbilicus. 



Type.— The type, U.S.N.M. No. 256118, was collected by myself 

 on a hillside on the west side of Mansalay Bay. It has 4.6 whorls, 

 and measures: Height, 11 mm; greater diameter, 25.9 mm; lesser 

 diameter, 21 mm. 



Remarks. — This race suggests closely Obba gallinula pagbilaoensis 

 Bartsch, from which it differs in being a little more lenticular; that 

 is, a little less inflated and smaller. 



OBBA LISTEEI (Gray) 



Martin Lister in his "Historiae sive Synopsis Methodicae Conchyli- 

 orum et Tabularum Anatomicarum," published in 1770, figures on 

 Tabula 66 the underside of a shell that is not quite adult, which may 

 well represent this species. 



John Edward Gray, in "A List and Description of Shells not Taken 

 Notice of by Lamarck," published in 1825 in the Annals of Philosophy 

 (new ser., vol. 9, p. 412), has the line, "C. Listeri. List. t. 66, fa. 64, 

 Mus. Brit.," which, translated, means that he here names the shell 

 which Lister figured as cited above Caracolla listeri. 



In 1841, W. J. Broderip published in the Proceedings of the Zoo- 

 logical Society of London (pp. 37, 38) a description of the shell and 

 a discussion of its relationship: 

 Helix (Carocolla) Listeri. Car. testa complanatd, umbilicatd; anfractibus 4, 



lineis incrementi creberrimh striatis, ultimo maximo acuto; albido-fusca maculis 



brunneis guttata*, et brcnnco uni-fasciatd; peritremate deorsum flexo auriculari, 



albido; labii unidentati margine acuto, antice lanceolato. 

 Long. y s ; lat. 1% poll. 



Hab. ad Albay insulae Luzon, truncis arborum haerens. 

 Legit H. Cuming in sylvis. 



Mr. Cuming had named this species Car. Gallina, but as it is designated as 

 Car. Listeri on the boards of the British Museum, and as Lister appears to have 

 been the first who figured it, but apparently from an imperfect shell, the latter 

 name is retained. 



