272 APPENDIX. 



Ann. Nat. Hist. Vol. v. p. 98, pi. 11, f. 8. monstrosity (from 

 type). 



VoL iii. p. 195. Cerithium advebsum. 



Add to the synonyms, — Turbo punctahts, Adams, Microsc. pi. 

 14, f. 21. Although a pallid variety of this species is occasion- 

 ally procured, we entertain but little doubt, that the large white 

 form mentioned in the Supplement to the " Testacea Britannica," 

 as taken by Bryer and Laskey (equally notable for the discovery ! 

 of exotic shells in our Islands), was a West Indian species, 

 allied to, but distinct from adversvni. 



Vol. iii. p. 200. Ceeithium. 



A much worn specimen of a Cerithium (or Cerithiojisis) whose 

 shape seemed manifestly different from any recognised native 

 species, was long ago placed in our hands by Mr. Alder, who 

 procured it from shell-sand taken (not by himself) in the Channel 

 Islands. Some doubt naturally arose in our minds from the cir- 

 cumstance of the alleged locality being one of the three hot-beds 

 (Weym^outh, Dunbar, Gruernsey) for spurious species ; but the 

 independent dredging of the top whorls of a second individual by 

 Mr. Barlee, sets the question of indigenousness at rest. We know 

 no described species to which we can positively refer it ; its cha- 

 racteristics, however, agree tolerably with the too succinct dia- 

 gnosis of C. angustissimum (Brit. Associat. Report, 1843, p. 190), 

 an iEgean shell, of which the types are not at present accessible. 

 The apex and mouth are imperfect in both examples ; we must 

 content ourselves then with enumerating the few perceptible 

 features, and calling the attention of collectors to the subject. 



Shell turreted-cylindraceous, very slenderly tapering, whitish 

 with an orange-brown sutural line. Whorls about eight (in the 

 specimen), rather high, peculiarly constricted at the suture, so 

 that the central area seems swollen ; coarsely cancellated by 

 spiral and longitudinal cords, the lattices formed by which are 

 decidedly broader than long ; spiral cords four on the principal 

 turns. Pillar orange-brown. Length rather more than a fifth of 

 an inch. 



