78 MOLLUSCA. 
shell presented some difficulty to Linnzeus, as he placed it 
at first among the Pinne, and afterwards among the Mye. 
Even Bruguiére gave it a place among the oysters. 
Another genus has been formed by Lamark from the mya 
siliqua of Chemn. (Conch. vol. xi. p.192, tab. 198, fig. 1934). 
He calls it Guycrmeris. Though nearly related to the true 
myz, by gaping at both extremities, yet it differs from them 
in the hinge, which is destitute of teeth, and in the ligament 
being external. 
A new genus was formed by M. M. Groye, (Annales du 
Museum, vol. ix.), which he terms PANnopra, and assigns 
to it the following characters :—“ Coquille transverse, bail- 
lante inegalement au deux bouts, charniére semblable dans 
l'une et dans l’autre valve, ayant une callosite ou grosse dent 
allongée, placée en avant et sur le corselet ; decurrente sur 
le bord interieur, relevée en aréte, mousse et saillant poste- 
rieurement; une dent cardinale conique un peu comprimée 
et arquée, et sur le valve droit une fosette dans laquelle s’en- 
gréne la dent de la valve opposée; ligament exterieur, cro- 
chets peu protuberans, corselet large, deux impressions 
musculaires dans chaque valve situées vers les extremites.” 
The type of this genus is the mya glycimeris of Gmelin first 
noticed by Aldrovandus. It is inserted among the British 
shells by Mr. Donovan upon very slight authority. In the 
construction of the genus, we think, that M.Groye has acted 
properly, but there was no necessity surely for changing the 
trivial name (of the first described species) bestowed upon 
it by the discoverer. He has added another species from 
Monte Pulgnasco in Parma. In the trivial name of this 
species, we consider that he has been guilty of an act of 
injustice. He has called it P. Fawas, in honour of Faujas 
St. Fond, the zealous Professor of Geology in the Museum 
