316 TROCHIDZ. 
hic et illic sparsis, notata ; sutura simplex ; apertura subrotunda, 
integra, superne in canalem brevissimam desinens; umbilicus 
inconspicuus, margine columnari paululum obtectus. 
Longitudo et latitudo circa 3 uncie. 
The animal at first view exhibits the general characters of 
Trochus serpuloides ; the only differences between the two are, 
that in the now Trochus Cutlerianus the cilia of the tentacula 
and vibracula are less close-set, the curved auricles of the foot 
much flatter and broader, the foot both anteally and posteally 
more rounded, and the eye-prominences may almost be called 
very short pedicles. The animal is infinitely more active, 
exhibiting a much greater rapidity of locomotion. Operculum 
corneous, with three or four lax spiral volutions. 
I have done myself the honour to attach to this new and 
elegant object the name of a lady residing at Budleigh Sal- 
terton, Devon, whose services in the various branches of natural 
history have been of great value: her retiring disposition 
would have declined, if she had known it, even this small 
tribute of consideration, and mention of qualifications of no 
ordinary stamp. 
T. nrtens, Philippi et nobis. 
T. pusillus, nonnull. 
———., Brit. Moll. ii. p. 534, pl. 73. f. 3, 4. 
The same difficulty in distinguishing the specialties of this 
species from those of the two preceding ones exists. I can 
only say, that the tentacula and vibracula may not be so long 
in proportion, the foot shorter, broader, and more rounded in 
front and behind, with the curved auricles more free or less 
attached to the anterior line of the foot, beg only amalga- 
mated with it by a broadish central lobe of union, than in 
either of the others; the eye-pedicles may also be more pro- 
nounced than in 7. serpuloides, but less so than in 7. Cut- 
lerianus. I never saw three animals so similar, malacologi- 
cally, with the hard parts so decidedly differmg in most re- 
spects. I may say that this species has four lateral vibracula, 
and it is possible the other two may have the same number. 
In these very minute beings, from their continual change of 
