446 PYKAMIDELLID.E. 



reflexed, and there is a rudimental denticle on the pillar-lip. 

 Axis y 1 ^, diameter ^ uncise. 



This very rare animal is an undoubted Chemnitzia, and 

 probably the first of the species that has ever been seen alive. 

 To add to the interest of this little narrative, I may state, 

 that Mrs. Gulson, who last year allowed me the honour of 

 attaching her name to this elegant shell, saw and examined 

 her namesake in a living state. 



I have searched in vain for a second example of this rare 

 animal, as I am anxious to review it ; however, I do not despair 

 of again meeting with it. 



CH. BARLEEI, Clark. 



Ch. eximia, Brit. Moll. iv. p. 278, pi. 90. f. 1 (as Rissoa eximia}. 

 Rissoa eximia, Jeffrey s. 



Bath, 17th January, 1851. 



My friend Mr. Barlee presented me some time ago with a 

 minute shell, which he considered an unpublished Rissoa, but, 

 on examination, I found it had all the conchological characters 

 of a Chemnitzia. Mr. Barlee obtained it in the Shetland 

 Islands. That the honours due to him may not be taken up 

 by some Bathyllus, I insert the following account of it. 



C. testa gracili, alba, costis circa duodecim subrectis instructa, 

 anfractibus quatuor rotundatis, quorum primus in sequentem 

 reflexus, alter duabus, tertius et ultimus striis tribus spiraliter 

 cincti. Apertura subovalis, haud continua, labium columnare 

 plica obsoleta, vel penitus abdita, latus externum sine callo. 

 Sutura linearis, distincta. Umbilicus vix notatus. Axis -j\, 

 diameter ^~ uncise. 



Hab. ad insulas Zetlandicas. 



These characters indicate, as far as conchological ones can, 

 that the animal, when observed, will prove a Chemnitzia. 

 The outer lip is without the callus of most of the Rissoa ; the 

 apex is undoubtedly reflexed, a character which is generally 

 the concomitant of the Chemnitzice. I believe no example of 

 a Rissoa with a similar apical structure is known ; we may 

 say that there is not a single essential character of the Rissoce 

 in this species. It is a congener of Chemnitzia excavata : 



