TROCHUS. 771 



Trochus, No. 76, and No. 77. Schroeter Einl. i. p. 709. 

 Trochus, No. 18, and No. ly. Schreihers Conch, i. p. 



244, and p. 245. 

 Chemnitz, v. p. 107. 1. 171. f. 1668 and 1669. 



Inhabits 



Chemnitz has here again described together two shells which 

 have a different appearance, and which have been arranged 

 separately both by Schroeter and Schreibers ; the above 

 specific character is taken from Gmelin, and I regret my 

 inability to mend it ; the figures are about eight lines long 

 and ten broad, and the former has been quoted by Ulysses 

 for his T. ardens (p. 469. t. 8. f. 9.)> but he notwithstand- 

 ing allows that there is an " essential difference." 



L^vis. 27. Shell depressed, brown, with the whirls 

 smooth, and obsoletely striated transversely; 

 base rather convex, and the umbilicus funnel- 

 shaped and white. 



Trochus laevis. Chemnitz, v. p. 108. 1. 171. f. I67O. 



Trochus Ifevigatus. Gmelin, p. 3573. Schreibers Conch. 

 i. p. 245. 



Trochus, No. 78. Schroeter Einl. i. p. 709. 



Inhabits 



Shell about six lines long, and eight broad, of an uniform pale 



brown colour, and Chemnitz says the umbilicus is sinuated. 



CROENLANDicus. 28. Shell somewhat turban- 

 shaped, flesh-coloured, with the whirls con- 

 vex, and very finely striated transversely ; 

 base convex, and the aperture sub-orbicular. 



Trochus Groenlandicus. Chemnitz, v. p. 108. t. 171. f- 

 1671. Gmelin, p. 3574. 



Trochus, No. 79. Schroeter Einl. 1. p. 7 10. 

 Inhabits the coasts of Greenland. Chemnitz. 

 Shell about seven lines long and eight broad, of a pale dull 



flesh-colour, and the inside pearly ; the base is convex, and 



the umbilicus large and deep. 



CRUCiATUs. 29. Shell convex, with callo-punc- 



tured transverse striaj, and the pillar one 



toothed. 



Trochus cruciatus. Linnaus Si/st. Nat. p. 1228. Chem- 



nitZf V. p. 113. t. 171. f. 1674. Schroeter Einl. i. p. 



