DESCRITTI DA F. SACCO 73 
Pecten vitreus, p. 45. Pseudamussium cretaceum, p. 52. 
Id. vola, p. 67. Id. var. denudata, p. 51. 
Id. Vulkae, p. 40. Id. dispar, p. 52. 
Id. Zibinica, p. 30. Il. exoticum, p. 51. 
PECTINIDAE, p. 3. Id. Gerardii, p. 52. 
Pectinites hispidus, p. 25. Id. liasinum, p. 52. 
Peplum, p. 37. Td. Melievillei, p. 52. 
Peplum var. alternicostata, p. 39. Ji. Nilsoni, p. 52. 
Id. var. Dumasii, p. 38. Id. nitidulum, p. 52. 
Id. inflexum, p. 37. A obliteratum, p. 52. 
Id. var. latecostata, p. 38. Id. oblongum, p. 52, 
Id. var. miopliocenica, p. 39. Td. pseudamussium, p. 51, 52. 
Td. oligopercostatum, p. 39. Id. semicingulatum, p. 52. 
Id. Rogersii, p. 39. Il. var. Semperi, p. 52. 
Id. septemradiatum, p. 38, 39. li. solea, p. 52. 
Id. var. subseptemradiata, p. 38. Id. suborbiculare, p. 52. 
Id. var. triradiata, p. 38. Id, tunetanum, p. 52. 
Pleuronectia comitatus, p. 51, 52. Id. virginianum, p. 52. 
ld cristata,p. 4T. Pyxis, p. 46. 
Il. difformis, p. 49. Pyxiîs piridata, p. 46. 
Il. duodecimlamellata, p. 48. Trigonosemus petoloideus, p. 51. 
Id. Philippii, p. 48. Variamussium, p. 49. 
Id. pyridata, p. 46. Variamussium alabamense, p. 50 
Propeamussium, p. 50. Id. calvatum, p. 50. 
Propeamussium, p. 48, 49. Id. cancellatum, p. 49, 50. 
Id. anconitanum, p. 50, 51. Id. felsineum, p. 49, 50. 
Id. Ceciliae, p. 50. Id. fenestratum, p. 50. 
Id. Dalli, p. dI. Id. paradoxum, p. 50. 
Id. eocenicum, p. 51. Id. personatum, p. 50. 
Id. fenestratum, p. 49. Id. var. virgulata, p. 49, 50. 
ld. paucicosta, p. 51. Vola var. bipartita, p. 59. 
Id. var. prodalli, p. 50. Id. bollenensis, p. 27. 
Id. semiradiatum, p. 51. Id. fabelliformis, p. 55. 
Id. Watsoni, p. 51. Id. Hermannseni, p. 56. 
Pseudamussiunm, p. 51. Id. Jacobaca, p. 58, 59. 
Pseudamussium, p. 46. Id. maurcima, p. 58, 59. 
Id. Bellardii, p. 52. Id. media, p. 60. 
1d° calvatum, p. 52. Id. var. striatissima, p. 59. 
Id. corneum, p. 48, 51, 52. 
ERRATA-CORRIGE 
pag. 14 linea 47 O. opercularis . . . Ae. opercularis 
» 39 » 39 Glabropecten . . . +. Ilexopceten 
» 62 >» 18 P. vigolensis . . +. + P. vigolenensis 
IONI, » 7 P. vigolensis . . . +. P. vigolenensis 
