IREDALE : OX MISUSED GENERIC NAMES. 303 



this Catalogue in a succeeding number of these Proceedings, but 

 Avould here note its effect upon two generic names. I find the 

 following entries : — 



"p. 16. Two fine species of Placuna, S., \iz. placenta and ephippium. 

 56. Plactma, 8. (A?iomia, L.), placetita and ephippium. 



136. Placuna ephippium, 8. (Anomia, L.), and 



140. Placuna 2)lacenta, 8. {Anomia, L.)." 



The ' S ' stands for Solander, and it must be concluded that 

 Placuna is here legitimately proposed as the genus name for the 

 species placenta and ephippium which Linne had placed in Anomia. 

 I designate the species placenta as type, and this will necessitate the 

 reversion to the familiar Placuna, as this name dates from 1786, while 

 Placenta, lletzius, only dates from 1788. 



I note that Gray in the Proc. Zool. 8oc , 1847, p. 195, wrote 

 '■'■Placenta, lletz. 1788. P/rt««m, Soland. An. placenta'\ apparently 

 unaware that Solander's name has priority of publication. 



Another interesting item may be here recorded. In Hutchins' 

 History of Dorsetshire, published in 1799, Pulteney wrote a Catalogue 

 of the Shells, and often made reference to Solander's manuscript. 

 On p. 35 he stated: "Under the term Ostrea, Linnaeus has com- 

 prehended the Oysters, the Scallops, and the shells called Isoqotia and. 

 Saddle-Oysters ... If they were separated, they must form more 

 than two genera : the Ostrea, the Pecten, and a third, -which I believe 

 Dr. Solander intended to call Placuna, including the Saddle-Oysters." 



Melina, lletzius. 

 This name has been recently used to replace the more familiar 

 Perna, but apparently another change must be made. In the 

 Catalogue of tlie Portland Museum, under the same circumstances as 

 in the preceding, I find — 



"p. 9. Ostrea isognomon, L., called Isognonia lignea by S(olander). 

 41. Isognomon perna, 8. {Ostrea, L.). 

 52. Ostrea perna, L. (Isogiionion, 8.). 

 115. Isognonia rigida, 8., for List. 227. 62. 

 137. Isognoma perna, 8. [Ostrea, L.)." 



From these quotations Isognomon must displace Melina, having 

 again two years priority. The type of Isognomon would be by 

 tautonymy, Ostrea isognomon, L. 



Jsogonum, Bolten, Mus. Bolt., 1798, p. 168, is exactly equal. 



Fischer in the Man. de Conch., p. 956, 1886, used Perna, but 

 quoted as sections: " Perna, s.s. P. ephippium, L., iuid Isognomon, Klein. 

 P. esognomum, L." 



I see Gray in the Proc. Zool. Soc. 1847, p. 200, wrote: 

 " Melina, lletz., 1788. Isognomon, Klein, 1753. Pedalion sp., 

 Soland. Ostrea ephippium. iV^rt/;o?«, Soland. !MSS. Ost. isognomon.^'' 



I have not yet noticed Solander's usage of Pedalion, and it may be 

 that Gray's was the first introduction of it. It is obviously equivalent 

 to Solander's Isognomon as here discussed. Whether Melina can be 

 retained in a subseneric sense I cannot now decide. 



