316 TKOCHIDJE. 



hie et illic sparsis, notata ; sutura simplex ; apertura subrotunda, 

 integra, superne in canalem brevissimam desinens; umbilicus 

 inconspicuus, margine columnari paululum obtectus. 

 Longitude et latitude circa ^ uncise. 



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. NITENS, Philippi et nobis. 



T. pusillus, nonnull. 



, Brit. Moll. ii. p. 534, pi. 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, being 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 T. serpuloides, but less so than in T. Cut- 

 lerianus. I never saw three animals so similar, malacologi- 

 cally, with the hard parts so decidedly differing 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 



