86 



it is found at prefent in a recent or living flate, we ?.i^ 

 ignorant. 



Spinulosus. Shell with three extremely globofe nrticulations, of a pale 

 Tab. 19. f.5. chefnut colour, covered with fpines ; the luperior bulb a 



trifle elongated to form the fyphon : the fpines all incline to 



the pofterior end. 



Since the figure referred to was engraved, we have been 

 favoured with a drawing of a fpecimen in the poHefrion of 

 Mr. Henry Boys that is fubarcuated, and rather taper, with 

 eight joints not fo ventricofe, and appears to be rather tu- 

 berculated than fpined. Length one tenth of an inch. 



It is probable this is a more matured fliell than the one 

 figured, for there is little doubt but the number of chambers 

 in moft of this clafs of Ihells increafes with age. Ours was 

 difcovered in the Boyfian cabinet, mixed with iN'aiitilus radi- 

 cula ; and it muft be admitted, there is fo much funilitude to 

 fome of the numerous variety of that species, that the prin- 

 cipal diftindlion confifls in colour, and the fpinous, or tuber- 

 culated appearance of this. 



BicARiXATUs. Shell fub-cylindric, arcuated, with eleven fub-globofe, 

 bicarinated articulations, or furniflied with a flight longitu- 

 dinal rib along the arc, and another on the oppofite fide : 

 the larger end is tenninated by a produced fyphon ; the 



joints 



