DESCRIPTION OF A NEW SPECIES OF 

 LAND SHELL FROM COLOMBIA. 



By EDGAR A. SMITH, F.Z.S. 



The British Museum is indebted to Mr. S. J. Da Costa for two 

 specimens of this very interesting species, which in several 

 respects is very similar to the Helix bogotensis of Pfeiffer. The 

 geographical distribution of the two forms is, as might be 

 expected, also different, the latter occurring in the neighbourhood 

 of Santa Fe de Bogota, and the present species to the north- 

 west, near the Cauca River. 



Labyrinthus assimilans, n. sp. (Plate IV., Figues 6-8). 



Testa depressa, orbicularis, profunde umbilicata, rufo-fusca, 

 lineis incrementi obliquis curvatis sculpta, undique plus minus 

 tenuiter granulata ; spira depresse conoidea, ad apicem obtusa ; 

 anfractus 4^ celeriter accrescentes, leviter convexiusculi, ultimus 

 ad peripheriam angulatus vel obtuse carinatus, infra medium 

 convexus, antice ad aperturam subito deflexus, pone labrum 

 contractus et scrobiculatus ; apertura transverse auriformis ; 

 peristoma continuum, album, undique solutum et expansum, 

 margine supero arcuato, intus tuberculo obtuso munito, pavietali 

 flexuoso, laminam validam prominentem emittente, basali obliquo, 

 rectiusculo, intus tuberculis duobis inaequalibus munito, dextro 

 dentibus duobus inaequalibus, in tuberculo elevato positis 

 instructo. Diam. maj. 26 millim. ; min. 22 ; alt. 12. 



Habitat : Cauca River, Colombia. 



In the form and armature of the aperture this species is 

 almost identical with L. bogotensis, Pfeiffer, but it is easily 

 distinguishable by its much smaller size and much more obtuse 

 periphery. The peristome also is not so produced or pointed in 

 front, the sinus between the tubercle within the upper margin 

 and the large double tooth within the front margin being 

 shallower and of a different form. 



