THE NAUTILUS. 127 



I have tried hard to find out just what shell Dr. Gould described, 

 have compared shells with the original type and have collected over 

 every foot of ground in the vicinity of Lake Beresford, where the 

 types were found. The original is a wedge-shaped, pitchy-black, 

 ray less and very. solid shell and in but one particular, resembles my 

 handsomely rayed, oval, thinnish shell, with a light chestnut epider- 

 mis. The single point of resemblance is the nacre, which in both is 

 brilliantly copper colored and iridescent. The type shell at Albany 

 is truncated anteriorly, and very abruptly so, according to my fig- 

 ures which are most faithful representations of the different views 

 of Dr. Gould's type specimen, and the dorsal margin is much more 

 strongly arched than in any of my U. fryanns. I will add that my 

 shell was not described from a small representation, but I have 

 fully a half bushel as near alike as two pins ; and I will add 

 further that no man can find my shell in Lake Beresford or in that 

 vicinity. Neither can it be said that they have become extinct 

 there as no vestige of them occurs on Hontoon Island, at the 

 entrance to Lake Beresford, where there is a perpendicular cut or 

 €nbankment, fully fifteen feet high, through a mass of Unios. 



True it is that U.fryanus can be connected by intermediate forms 

 with U. eorriscus Gd. So also I can just as perfectly connect Mr. 

 Simpson's U. suhluridus, which he has just described from Florida, 

 with any one of a half dozen Florida species. 



SLUGS INJURING COFFEE. 



BY T. D. A. COCKERELL. 



Mr. Walter W. Wynne, of Brokenhurst, Mandeville, Jamaica, 

 sends me some slugs which injure his coflTee trees, together with the 

 following interesting notes: "I first noticed this pest in 1888; it 

 was brought to my notice by seeing numbers of brown leaves on 

 the trees, all at the ends of the primaries. I was very much afraid 

 the leaf disease had come here ; however, on examination I found 

 the new growth was, in every case, barked, and after some search 

 found it was done by the slug. Since the discovery I have hardly 

 left oflT my ' picking gang,' which turns over the rocks and stones, 

 dead tree-trunks, etc., where the beasts lurk in daytime ; I have also 

 put heaps of lime at the tree roots, which helps to keep them away 



