68 
Rev. Canon Norman’s Revision 
Distribution . Bay of Biscay, 1 Travailleur ’ {Jeffreys)) ; off 
Azores, 450-1000 fathoms, c Challenger’ ( Watson) ; Azores, 
1287 metres (Dautzenberg) • 6 Blake,’ Stat. 43, lat. 24° 8' 
N., long. 82° 5F W., 339 fathoms {Dali). 
Fossil. Middle Pliocene of Calabria {Seguenza). 
Mr. E. A. Smith has kindly, at my request, compared the 
specimens of this species which are in the British Museum 
with the figures and description of B. Guernei , Dautzenberg, 
and has confirmed my expectation that the latter cannot be 
regarded as specifically distinct from B. semilevis. It is clear 
also, I think, that B. eburnea , Dali, is the same thing. 
Genus 2, Haminea, Leach. 
47. Haminea hydatis (Linn.). 
Var. globosa , Jeffreys. 
Genus 3. Aceea, Muller. 
48. Acera bullata , Muller. 
Var. 1. nana ) Jeffreys. Length A inch. 
Var. 2. Farrani , Norman. Length If inch. 
Aker a bullata , var. gigantea , Norman, Museum Norman- 
ianum, iv. Mollusca, 1888, no. 101. 
The variation in size in this species is most extraordinary, 
and perhaps the forms here treated as varieties should rather 
be regarded as entitled to rank as species. The full size of 
ordinary specimens may be taken as an inch ; but no speci- 
mens of var. nana , which was dredged by Jeffreys and 
myself in shallow water at Balta Sound, Shetland, exceed 
three twentieths of an inch. On the other hand Dr. Farran 
found many years ago (see Nat. Hist. Review, vol. iv. (1857) 
p. 74) the gigantic variety which I here name after him. 
The specimens were dredged near Birterbuy Bay, Ireland : 
the animal measured 3 inches long and 2^ wide, and 
weighed ounces. The shell of one of these giants, now 
in my collection, measures If inch long and an inch wide ; 
hundreds of specimens of var. nana might be placed in 
it as in a box! In 1876, in company with my friend Mr. 
David Robertson, I dredged diligently the spot carefully 
described by Farran, but without again meeting with this 
form ; but Mr. A. G. More informed me that the year before 
that just mentioned he had found a similar-sized specimen in 
a lough nearer Galway. 
