106 



are not in the specimens, although they are hollow, and 

 to all appearance perfect. 



Found with the last in decomposed Limestone, from 

 the general wreck of which they have escaped by being 

 composed of silex. 



SPIRIFER Walcotti. 

 TAB. CCCLXXVIL— P«o . 2. 

 Spec. Char. Suborbicular, gibbose with one 

 large, rounded, elevated fold iu the middle, 

 and four smaller ones on each side. 



Hear pointed, incurved, the hinge line is shorter than 

 the width of the shell ; both valves are equally gibbose 

 and smooth, the smaller one is shorter than wide ; the 

 area between the beaks is rather rounded, but furnished 

 with a triangular foramen. 



Found many years ago by Walcott, at Camerton, 

 about six miles and a half from Bath, on the road to 

 Wells, and represented by him in his work upon the 

 Petrifactions found near Bath,^^s. 33. Walcott observes 

 of similar shells, " that those found on the upper Bristol 

 road near Bath, are smaller ; their shell thin ; white ; 

 a triangular hole between the beak of the lower valve, 

 and the hinge ; and have the body Jig. 33. A. B. within 

 them ; it consists of two hollow cones joined to each 

 other by part of their base and to one of the valves, but 

 not so close as to prevent the animal, or part of it, from 

 retreating into them : the surfaces of them are beautifully 

 covered with circular rows of small pyramids of spar." 

 Thus it appears that he was the discoverer of the spiral 

 appendages long before they were used as a generic 

 character, although he did not clearly see their spiral 

 form : he also observed the triangular foramen, and it is 

 much to be regretted that he did not figure the shells as 

 well as their contents, as tiiey probably were a different 

 species from the one before us. 



The 3 upper ligures are from a specimen in M. de la 

 Beche's cabinet found in the Lias of Keynsham ; the 

 other two were given me by the Rev. Robert Plumtree, 

 who collected them at Pyrton Passage, near Berkley, 

 Gloucestershire ; they are rather compressed. 



