THE NAUTILUS. 47 



U. triangularis Lea. Southern part of the State. 



U. undidatus Bar. An abundant species in suitable localities in 

 the southern part of the State. Dr. De Camp sends me a specimen 

 which I think should be referred to this species, labelled U. airo- 

 costatus with the following note : "This I found in Black Lake, 

 Ottawa county, I think plicatus and latecostahis distinct; but would 

 hardly say this of atrocostatus were it not for finding it only in the 

 still water of the lake, while the other almost universally inhabits 

 rivers with current." 



U. ventricosus Bar. Very abundant all over the State and 

 extremely variable. In many localities it attains a large size. 

 Detroit river specimens are small and with comparatively thin 

 shells. 



U. verrucosus Bar. Southern part of the State. 



( To de conclnded.') 



GOULD'S TYPES OF NASSA AND COLUMBELLA. 



BY W. B. MARSHALL. 



Tryon has expressed the belief that the types of several species 

 of Nassa and Columbella described by Dr. A. A. Gould were 

 destroyed in the Chicago fire. 



Among others he mentions the following : — Nassa beata, Loo 

 Choo Is. ; Nassa opiata, Sydney, N. S. W. ; Nassa spurca, St. 

 Simon's Bay; Columbella minuscula, Ousima; Columbella zonata, 

 Kagosima. 



Referi-ing to the types of Nassa, Tryon said " Most of the above 

 are from the collections of the North Pacific (U. S.) Exploring 

 Expedition ; they have not been figured and the type specimens 

 were destroyed in the great Chicago fire. Some of them might be 

 identified with other described species, but it is better not to do so. 

 I think, under the circumstances.^ 



In a note under his description of Columbella (Seminella') minus- 

 cula, Tryon said " Unknown to me. The types of this, the preced- 

 ing and following species described by Gould are believed to have 

 been destroyed at Chicago by fire.'-" 



The types of the five species mentioned above were not destroyed. 

 They are now in the collection of the New York State Museum at 

 Albany and are represented as follows : — 



' Manual of Conchology, (I) iv, p. 63. 

 ^ Ibid. V, p. 171. 



