•; 
INDEX TO THE HISTORIA CONCHYLIORUM 
Tnb. 
192 
Fig. 
29 - 
Gmelin lias quoted this figure for Ostrea opercularis, of which it appears to me to 
be a variety, and from it his Ostrea dubia has also been constituted: Brocchi, in 
the “ Conchiologia fossile subapennina,” however, considers it to be distinet, and 
has quoted this figure for a fossil species, for which he has retained the name of 
Ostrea dubia. 
193. 30. In the Descriptive Catalogue I have followed Born, Chemnitz, Gmelin, and Shaw, 
as well as some other naturalists, in quoting this and the following figure for 
Ostrea denticulata, but am far from certain that it is more than a variety of 
Ostrea edulis: it has been copied from the Historia Animalium Anglire, t. 4. 
f. 26. 
194. 31. Same as fig. 30 : and it has been copied by Klein in his Methodus Ostracolog. t. 8. 
f. 21. 
j. Mytilus Frons. 
Is the Perna Vulsella of Lamarck, and has been generally considered to be a va¬ 
riety of Ostrea Perna. 
j- Ostrea Virginica. 
197 - 
198. 
199 - 
32. 
32. 
33. 
200 
201 
202 . 
203, 
204 
205 
20 6 
207 
208 
34. 
35. 
36 . 
37 . 
38. 
39 . 
40. 
41. 
42. 
} Anomia undulata: and the former is a copy from the Historia Animalium Anglia;, 
t. 4. f. 27. where both the valves are figured. 
Anomia Ephippium. 
Anomia electrica. 
209. 
210 . 
43. 
44. 
211. 45. 
212 . 
213. 
46 . 
47 - 
48. 
214. 49. 
215. 
50, 
51 
216 
217 
219 
220 
52 . 
53. 
54. 
55 
j. Spondylus Gcedaropus. 
Spondylus costatus of Lamarck, and has been generally considered to be a variety 
of Spondylus Gcedaropus. 
A worn shell of Spondylus plicatus. 
Is a species separated from Spondylus plicatus by Lamarck, with the name of Pli- 
catida cristata. 
From this the Anomia Spondyloides of Gmelin has been wholly derived, and it is 
probably a coarsely exeeuted figure of some fossil Terebratula. Kleiifs t. 12. 
f. 82. and 83. are copies. 
Anomia Psittacea ; and Klein’s 1.12. f. 84. and 85. are copies. 
Chama Gryphoides. 
Chama sessilis. In the Descriptive Catalogue I have arranged the Chama squa¬ 
mosa of Chemnitz as the same species, and have since ascertained that it is dis¬ 
tinet. Klein, in the Methodus Ostracolog. has copied this figure, t. 12. f. 86. 
Lister has copied these figures from Columna “ de Purpura,” p. 30; and they re- 
present, in two different points of view, the same valve of Chama cornuta : and 
their having been mistaken for two opposite valves, has given rise to the badly 
constituted Linnean species of Chama bicornis. They have been copied in tab. 
12. of Klein’s Metbodus Ostracolog. and in several other conchological works. 
The Chama bicornis of Bruguiere is quite different, and is a fossil to which La¬ 
marck has given the name of Diceras arietina. 
A variety of Chama Gryphoides. 
Is a variety either of Chama Gryphoides or of Chama lamellosa : and Klein, at 
1.12. f. 81. of the Methodus Ostracolog. has copied this figure. 
j- Chama lamellosa. 
Ostrea Malleus. 
Belongs to the Mytilus Hirundo of Linneus, which has lately been divided into 
many species, and the present figure is the Avicula semi-sagitta, of Lamarck. 
221. 56. Mytilus margaritiferas ; and it has been copied by Lister from a figure at p. 41 of 
the Museum Calceolarianum. 
223. 
224. 
57 
58 
59 
j. Variety of Mytilus margaritifer 
A variety of Mytilus Hirundo. Lister has copied this figure from a work by Co¬ 
lumna, entitled, “ Aquatilium et Terrestrium aliquot Animalium aliarumqne Na- 
“ turalium rerum Observationesand it has been again copied by Petiver in his 
