^^(j Mr. Home's Defcription of 



longitudinal, making a band the whole length of the body, on; 

 the edge of which the tranfverfe fibres running acrofs the back 



terminate. 



The two cartilaginous fubftances by which the animal ad- 

 heres to its fbell, are placed one on each fide of the body, and are 

 joined together upon the back of the animal at their pofterior 

 edges : they are about three-quarters of an inch long, are very 

 narrow at their anterior end, becoming broader as they go 

 backwards ; and at their pofiierior end they are the whole 

 breadth of the body of the animal. Upon their external fur- 

 face there are fix tranfverfe ridges, or narrow folds ; and along 

 their external edges, at the end or termination of each ridge, 

 is a little eminence refembling the point of a hair pencil, fo 

 that on each fide of the animal there arc fix of thefe little pro- 

 je6llng fiiuds, for the purpofe of adhering to the fides of the fhell 

 in Vv'hich the animal is inclofed. The internal i'urfiices of 

 t\\t{Q cartilages are firmly attached to the body of the animal, in- 

 their middle part, by a kind of band or ligament ; but the upper 

 and lower ends are lying looie. 



From the end of the body, between the two upper ends of 

 thefe cartilages, arifewhatl fuppofe to be the tentacula, confift- 

 inp- of two cones, each having a fpiral membrane twining round 

 it : they are clofe to each other at their bafes, and diverge as- 

 they rife up, being about an inch and a quarter in length, and 

 nearly one-fixth of an inch in thicknefs at their bafe, and gra- 

 dually diminifhing till they terminate in points. The mem- 

 branes w^iich twine round theie cones alfo take their origin 

 from the body of the animal, and make five fpiral turns and a 

 half round each, being loft in the points of the cones ; they 

 are loofe from the cone at the lowefi: fpiral turn which they 

 make, and are nearly half an inch in breadth; they are exceed- 



ingly 



