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



Ancylus oblongus, iv, 188. Guerusey {Bi\ Lukis). 



Cono^-ulu3 denticulatiis, var. reflexa {Turton), iv. 194. Cary- 

 chium personatum, ^lichaud, Suppl. to Drap. p. 7^. Guernsey 

 {Dr.LuJiis). In crevices of rocks above high-water mark, Golding- 

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

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

 individuals is encircled with a coronet of sjnnes or bristles, as in tlie 

 tvpical form. A representation of this well-marked varietv is given 

 at PI. y. fig. 1 Off, i. 



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

 species is found in Alderney, bat not in Guernsey. 



1, Montagu Square, London, 

 July 1858. 



EXPLANATION OF PLATE V. 



Fig. 1. Cardiura papillosum, var. : a, natural size; h, magnified. 



Fig. 2. Clausina CrouUnensis : «, natural size; 6, magnified ; e, hinge, 



magnified. 

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



c, back view, magnified ; d, interior of lower valve ; c, 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 : «, natural size ; b, magnified. 

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

 Fig. 8. Cerithiopsis pulchella : a, 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, Max. reflexa: a, natursil size; 5, magnified. 



XV. — Ohsei-vatioiis on Conchological Nomenclature. 

 By M. 0. A. L. Morch. 



In the 'Annals of Natural History' for January 18.57, 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 Testaeea of Linnreus scarcely corresijond in 

 value to the Orders in his classification of the higlicr 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. t^ Mag. N. Hist. Scr. 3. Vol.u. 10 



