26 MARSHALL: ALTERATIONS IN ‘BRITISH CONCHOLOGY.’ 
and adopted by the late Mr, Gay in 858, but the var. 
dumastt agrees more nearly with Linne’s description.’— 
Jeffreys, ‘Lightning’ Report. 
It is now generally conceded that P. septemradiatus 
Mull. is a variety only of the type, the type being what 
English collectors have hitherto called var. dumasii Payr. 
The latter should therefore be called P. fes-lutre J.., and 
the former P. fes-lutre var. septemradiatus Miill. 
Lima elliptica var. leviuscula Jeff. The author fell into 
an error in making this a variety. He observes that 
‘although evidently immature, it differs from the young of 
the typical form in being destitute of ribs.’ These speci- 
mens are about a line in length, and are dredged in very 
fine sand in deep water. But if compared with adult 
examples from similar ground and depth, it will be observed 
that the region of the umbones in the adult is quite smooth, 
and the shell generally thinner and less strongly ribbed 
than those from shallower water. I have specimens from 
the Minch, 70 fathoms; the Sound of Sleat, 85 fathoms ; 
and other localities in the Hebrides, with the umbonal area 
perfectly smooth, clearly indicating that this variety is the 
young stage of a thinner form. The very young of Z. 
loscombii are also smooth. 
Leda pygmeea Miinst. Philippi assigned his Vucula tenuts 
to the WV. pygmea of Von Miinster, but that is a different 
species, and fossil, so that Phillipi’s name ¢enw7s should 
stand for this species. (See ‘ Lightning’ Report, p. 577) 
Both names are inappropriate to the species, and especially 
that of evs, as there is not only some confusion between 
the genera Wucula and Leda, but there is already a well- 
known Mucula tenuis. 
Mr. Edgar Smith has substituted Wuculana for Leda 
on account of the priority of the former by some years, 
and Dr. Morch agrees with him. Mr. Dall, on the 
other hand, claims Miculana for a group only of Leda, 
JE@iy Villy, Jans eos. 
