174 PHYLLOBRANCHIA. TURBONIDZ. 
testaceous ; the middle groove fuscous brown, the whorls trans- 
versely banded with red. Height one inch. 
Inhabits the Irish seas; is very rare. 
Genus 75. MoOntTAGUA. 
Testa obtusé conica. Apertura integra. Peritrema incras- 
satum. Umbilicus in senioribus clausus, in junioribus apertus. 
Operculum tenue, corneum. Animal incognitum. 
The shell is obtusely conie ; its aperture entire ; its peritreme 
thickened ; the umbilicus is closed in adult shells, but open in 
young shells. The operculum is thin and horny. Animal 
unknown. 
MonTaGua DANMONIENSIS. 
M. testa anfractibus lineis spiralibus, tenuibus, glabris, elevatis, 
sculptis ; interstitiis obliqué et tenué elevato-lineatis. 
Habitat in mari Danmoniensi et Cornubiensi. Testze linez 
elevate, griseze. Mus. Montagu et nost.in Mus. Brit. Alt. 
% unc. 
Shell with its whorls with narrow, smooth, elevated, spiral 
lines ; the interstices with oblique and slightly elevated lines ; 
all the elevated lines grey. Height two-eighths of an inch. 
Inhabits the sea on the southern coasts of Devon and Corn- 
wall. 
This species was discovered by Mr. Montagu a short time 
before his death. Mr. Cranch has found it in the Kingsbridge 
estuary, the Plymouth Sound, and in Falmouth Harbour. 
Genus 76. NEPTHEUSA. 
Trochus Auctorum. 
Testa moderatim elevata. Apertura rotundata. Umbilicus 
peritremate clausus. Anfractus subtumidi. Animal incog- 
nitum. 
Shell moderately elevated. Aperture rounded. Umbilicus 
closed by the peritreme. Whorlssubtumid. Animal unknown. 
ore. 
