DEW 
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and their Geographical Distribution. 487 
retus, Tornatella, Skenea, Janthina, "Turritella, 
Scalaria, Odostomia, Cancellaria, Pleurotoma, Ros- 
tellaria, and "T'richotropis. 'The number of species 
added to some of the g genera. is remarkable. Thus, 
there have been added.to Nucula 6, to Chiton 5, to 
Bulla 6, to Margarita 4, to Cerithium 4, and to 
Ca 3 species, Seventy species have been 
discovered and described as new, within the last five 
years; while, on the other hand, more than twenty 
species which had been described as new, by differ- 
ent writers, have been proved to be well known, 
and previously described, on the other side of the 
Atlantic. . - 
They are distributed under the following genera, 
namely; Pectinaria 1, Spirorbis 3, Serpula 1, Coron- 
ula 1, Balanus 6, Anatifa 3, Cineras 1, Otion 1, T'e- 
redo 1, Pholas 2, Solen 1, Solecurtus 2, Machæra 2, 
Solemya 2, Panopea 1, Glycymeris 1, Mya 2, Cor- 
bula 1, Pandora 1, Osteodesma 1, Anatina 1, Cochlo- 
desma 1, Thracia Mactra 3, Cumingia 1, Mesodes- 
ma 2, Montacuta I, : ellia m Saxicava 1, Petricola 2, 
Sanguinolaria. 2, Tellina 2, Lucina 3, Cyclas 4, As- 
tarte 5, Cyprina 1, Cytherea 1, Venus 4, Cardium A, 
Cardita 1, Arca 2, Nucula 8, Unio 5, Alasmodon 3, 
Anodon 3, Mytilus 2, Modiola 7, Pecten 3, Ostrza 2, 
Anomia, 2, Terebratula 2, Chiton 6, Patella 1, Lot- 
tia 2, Dentalium 1, Cemoria 1, Crepidula 4, Bulla 9, 
Helix 16, Pupa7, Bulimus 1, Succinea 3, Auricula 2, 
Planorbis, 11, Physa 3, Limnza 6, Ancylus 2, Val- 
vata 2, Paludina 1, Amnicola 1, Natica 8, Janthina 1, 
Velutina 2,. Raters 1, Tornatella 1, Vermetus 1, 
Skenea 1, Scalaria A. Maia 5, Littorina 3, La- 
