274 APPENDIX. 



views of species are not so utterly at variance with our own im- 

 pressions. His guesses at truth (for they are no more, inasmuch 

 as he had rarely the advantage of seeing the types, but only 

 certain shells belonging to Mr. Barlee, which he considered such) 

 coincide oftentimes with our own conjectures ; our rule, however, 

 has ever been to admit all published species as veritable ones, 

 unless we could discover direct proofs to the contrary. Mr. 

 Jeffreys' monograph of the group, served as a basis for our own, 

 because we knew of the extreme pains lavished by that most 

 truthful naturalist upon his subject, and we determined not to 

 repudiate any of his supposed species upon slight grounds of 

 dissent. We shall now enumerate the changes determined upon 

 by him ; but neither acquiesce in nor dissent from conclusions 

 at which we are sometimes a little astonished. 



Ch. formosa is ascribed as a variety to rufa proper. 



Ch. rufescens is considered a variety of scalaris. 



Ch. clathrata is regarded as a variety of indistincta. 



0. conspicua, and not improbably 0. striolata, are supposed to 

 be forms of acuta, to which the 0. turrita of Hanley (unidentata, 

 var. turrita of the present work) is also referred. The name 

 turrita, be it remarked, was published long before acuta, 



0. chibia, alba, nitida, Rissoides, Etdimoides, and glabrata ? 

 are all called C pallida, and we are declared to have stated that 

 Montagu's type of Turbo pallidus was not positively his own 

 specimen. 



0. truncatvla is said to be an adult nivosa. 



Evlvmella affinis is stated to be specifically identical with E. 

 acicula. 



In the descriptions of the animals of Odostomic, cited from 

 Mr. Clark, the " mcntum " is often described as a muzzle. 



Mr. Clark holds with Mr. Jeffreys that these three groups con- 

 stitute but a single genus. We have considered them distinct, 

 but are ready to degrade them to the rank of sub-divisions, 

 should future researches on their organization and distribution 

 both geographical and chronological, support the belief in their 

 unity as a natural alliance. Mr. Alder would keep Odostomia 

 and Chenmitzia apart, but unite Eulimella with the latter. 



