176 I. Kill's CORONA. 



This group is still unknown anatomically. In shell-characters il 

 B< 'ins more nearly allied lo ffemtbulimus than to other known sub- 

 genera of 1 h-tlmln-iiitv, agreeing with that group in the vertically 

 wrinkled nepionic shell, tlie deeply excised inner lip, and the truncate 

 columella. It differs from Hemibulimus in the brighter coloration, 

 and heavily calloused columella. The structure of the columella i> 

 remarkably like some species of Mrtortlnilicns, a group distinguished 

 by its pitted apical sculpture, and thick outer lip. 



A liters, 1'feilfer, Shuttleworth, von Martens and others have in- 

 cluded a greater or less number of incongruous species in (.'nrona. 

 Excluding these, the siibgenus consists of a group of very closely 

 allie<l forms, which when full geographic series are collected and 

 studied may prove to he varying races of a single species. Cousin 

 has taken this view (Hull. Xool. Soc. France, vii, iSN'.t, p. 11)3); 

 but the obvious errors of fact and crudities of judgment every\vh< pe 

 apparent in his *' Fauna Malacologique de la Republic de 1'Eipiateur," 

 and particularly so in his paragraphs upon (.'oruiitt reyiim, do not 

 recommend his views to us. 



The distribution of several of the forms is involved in obscurity. 

 L. rri/'i/ft, with its variety tf>r<iisin/ni.<, is known to be a species of 

 the ii], per Ama/on,in Eastern Peru and Ecuador, and western Hraxil, 

 L. iin-isiis inhabits the forests ea.-t ot the Cordillera in Holivia, and 

 apparently occurs also in the province of Hahia and in ( Juiana. Tin- 

 is a wide range, and the identity of the Guiana shells with those of 

 Holivia is not absolutely certain. Of L. perversus I have an appar- 

 ently authentic specimen from Demerara; but no habitat is yet 

 known for the typical L. n'i/>nn. 



When the \\ide gaps in distribution indicated above are narrowed, 

 and large series from single localities are collected, the number of 

 >pecies and their limits mav become clear to us. Meantime ihese 

 are open questions ; and in declining to "lump "them I should not 

 be understood as holding the opinion that the forms are distinct 

 specie-; I merely de.sjn- io leave the .subject iii convenient order for 

 tho.se \\lio come alter. To this end the several forms ha\e been dis- 

 ci imiiiated and the whole literature rearranged. Should the group 

 be- reduced to a single >pecies, the name JI, rnrs/is S\\ains., will take 

 precedence over rei/i/iii For. for the whole a^emblage. 



There are several names similar to Cum/in, and of earlier date, in 

 n-e in /oology. If tin- niollu>can group-name be considered pre- 

 occupied by any of them, it may be called J't 



