1881.] NATURAL SCIENCES OF PHILADELPHIA. 425 



arriving at a satisfactory conclusion as to tlieir proper generic 

 affinities. Philippi (loc. cit., p. 41) classed his species under the 

 Cardiacea^ immediately after tlie genus Isocardia, a somewhat 

 similar view being entertained by Oronzio Costa as to the position 

 of his genus Iphigenia (= Verticordia ? Wood,' Seguenza, Jour, 

 de Conchyliologie, 2d ser., iv, 1860, p. 290), which he placed in 

 the proximity of the Carditee. Seguenza states {loc. cit.) that 

 the same views were entertained by Woodward in his " Manual of 

 Mollusca," but that author seems to have overlooked the remark 

 in the supplement to the work just mentioned (p. 471 ; and 

 second edition, 1868, p. 472), whereby the genus is referred 

 " undoubtedly " to the Trigoniadse. The relationship with 

 Trigonia is maintained b}' H. and A. Adams in their " Genera of 

 Recent Mollusca," 1858, ii, p. 531), and by Deshayes in his 

 valuable remarks on the family Trigonea Lamarck, and the 

 genera Verticordia and Hijyjjagus (Animaux sans Yertebres, 

 Bassin de Paris, i, pp. 805-10), although the last named naturalist 

 in his review of the Cardiaceea (loc. cit., p. 529), distinctly states 

 that, for the time being, the genus Pecchiolia (misprinted Fet- 

 chiola), which, on pages 806 and 810, he points out to be indis- 

 putably linked to Verticordia and Hippagus, will probably- have 

 to be referred to that family. According to Pecchioli (Revue et 

 Magasin de Zoologie, 1852, p. 577) Meneghini, on establishing 

 this genus, considered it as allied to Diceras of Lamarck, a view 

 to some extent shared hy Stoliczka, who,on proposing the family 

 Verticordiidae for the genera Pecchiolia, Verticordia and Allo- 

 pagus (loc. cit., p. 224), places the same in his order Chamacea. 

 Lea's Hippagus is found a refuge among the UnguUnidae, near 

 Scacchia, the affinity with which, it must be confessed, appears 

 to us as rather remote. Mr. Arthur Adams states in his 

 observations on Verticordia Japonica (Annals and Magazine of 

 Natural Histor}^, .3d series, ix, 1862, p. 224), that the animal has 

 no relation to Trigonia, but, on the contrary, that " its position, 

 judging both from the nature of the animal and the form of the 



^ I have been unable to gain access to Costa's woi'k, and therefore can- 

 not, from personal observation, pronounce upon the value of the genus 

 Iphigenia; its identity with Verticordia is given upon the authority of 

 Seguenza, but judging from tliis author's descriptions and figures of his two 

 species of Verticordia, it would appear that he had confounded with that 

 genus the genus Pecchiolia. 



