M. 0. A. L. Morch on Conchological Nomenclature. 133 



Ancylus oblongus, iv. 188. Guernsey (Dr. Lukis). 



Conovulus denticulatus, var. reflexa* (Turton), iv. 194. Cary* 

 thium personatum, Michaud, Suppl. to Drap. p. 73. Guernsey 

 (Dr. Lukis). In crevices of rocks above high-water mark, Golding- 

 ham Bay, near Paignton. The colour of the animal is yellowish 

 white, and that of the tentacula light grey. Each whorlm young 

 individuals is encircled with a coronet of spines or bristles, as in the 

 typical form. A representation of this well-marked variety is given 

 at PI. V. fig. 10 M. 



Cyclostoma elegans, iv. 201. Dr. Lukis informs me that this 

 species is found in Alderney, but not in Guernsey. 



1, Montagu Square, London, 

 July 1858. 



EXPLANATION OF PLATE V. 



Fig. 1. Cardium papillosum, var. : a, natural size; b, magnified. 



Fig. 2. Clausina Croulinensis : a, natural size ; b, magnified ; c, hinge, 



magnified. 

 Fig. 3. Argiope decollata, var. : a, natural size ; b, front view, magnified ; 



c, back view, magnified ; d, interior of lower valve ; e, interior of 



upper valve. 

 Fig. A. A. cistellula, var.? : a, natural size; b, magnified. 

 Fig. 5. Rissoa Alderi: a, natural size; b, front view, magnified; c, back 



view, magnified. 

 Fig. 6. Cerithium Metaxa : a, natural size ; b, magnified. 

 Fig. 7. Eulima stenostoma : a, natural size ; b, magnified. 

 Fig. 8. Cerithiopsis pulchella : «, natural size ; b, front view, magnified ; 



c, back view, magnified. 

 Fig. 9. Mangelia scabra : a, natural size ; b, front view, magnified; c, back 



view, magnified. 

 Fig. 10. Conovulus denticulatus, var. reflexa : a, natural size ; b, magnified. 



XV, — Observations on Conchological Nomenclature. 

 By M. 0. A. L. Morch. 



In the 'Annals of Natural History' for January 1857, there 

 appeared a review of the ' Genera of Recent Mollusca/ by Messrs. 

 H. and A. Adams, which has only very recently come under my 

 notice, and which appears to me to call for a few observations, 

 both on the general principles adopted by the reviewer, and on 

 the individual errors indicated in the review. 



The state of conchology has in many respects been for a long 

 time far behind that of most other departments of Biology. 

 The genera of the Testacea of Linnseus scarcely correspond in 

 value to the Orders in his classification of the higher animals ; 

 and the genera established by Lamarck, now commonly in use, 

 hardly possess the rank that should be given to families. The 

 want of a better systematic arrangement in this branch of natural 

 history has for a considerable period been felt by many naturalists; 



Ann. $ Mag. N. Hist. Ser. 3. Vol. ii. 10 



