306 Mr. J. E. Gray on Philippi's Zoological Notices* 



7. Pandora striata, Diet. Hist. Nat. xxv. 



8. Pandorina ? equivalvis Philippi, Sicul. xviii. t. 1. f. 11. a.b.c. 

 Paadorina coruscans, Scacchi, Sp. Zool. 14. Costa. 



There is a second species very nearly allied to it, but which 

 differs in being much narrower and longer in proportion. Ly- 

 onsia is the oldest published name for the genus; Magdala 

 was the name that Dr. Leach first gave to it in his MSS., but 

 he afterwards used Lyonsia. Brown, not satisfied with adopt- 

 ing Dr. Leaches earlier manuscript name, instead of Lyonsia, 

 has also added a new one, viz. Myatella, The shelly plate 

 which is found in the hinge of this genus in the most perfect 

 state of development, wa?, I believe, first described and figured 

 by Mr. Wood in his Conchology. This plate is peculiar to a 

 group of genera, which I think for several reasons, especially 

 on account of the general structure of the animals, should be 

 formed into a family separate from the Myadce, This family 

 contains the following genera : — 



Anatina=:Auriscalpium, Schum. 



Cochlodesma=Anatina, §.2. Turton. 



Periploma, ^ScAwm. = Osteodesma (part) Desk. 



Thracia=Odoncinetus, Costa. 



Lyonsia = Magdala and Myatella, Brown = Osteodesma (part) 

 /)e5A.=Pandorina, Scacchi. 



Myadora, Gray. = Pandora (species) iSoweriy. =: A natina, Stutch- 

 hury, for Pandora brevis, Sow. 



Chamostrea, Roissy. = Cleidotherus Stutchbury, not Sowerby, as 

 quoted by Dr. Philippi. 



Myochama, Stutchbury, and probably Cardilia, Desh. =zllemicy- 

 clonosta, Desh. 



I described the animal of this genus in the first number of 

 my ' Spicilegia Zoologica,' when describing Lyonsia cuneata. 

 The species of the different genera ofAnatinidce pass very gra- 

 dually into each other, and I do not think that Lyonsia has 

 any affinity to either Pandora, Solenomya or Galeomma, the 

 latter having many characters in common with Gastrochcena* 

 Lyonsia has the piece in the hinge both in the young and 

 adult state ; and it may be remarked, that all bivalve shells. 

 Pandora as well as the rest, have both a ligament and a car- 

 tilage, which is often called a double ligament. 



