Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . oon disappears ingeneral as the shell increases in size. Mr. Lea appears to be ignorant of the true distinc-tive character of this species, since he affirms that Ihave published it under the name of mytiloides; thelatter is destitute of the callosity of the cardinal platewhich characterizes the oblujuus, has a very differentlunule, and is dissimilar in outline to that who are conversant with the two shells willnot confound them. Mr. Lea considers the obliqaa of Lamarck t
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . oon disappears ingeneral as the shell increases in size. Mr. Lea appears to be ignorant of the true distinc-tive character of this species, since he affirms that Ihave published it under the name of mytiloides; thelatter is destitute of the callosity of the cardinal platewhich characterizes the oblujuus, has a very differentlunule, and is dissimilar in outline to that who are conversant with the two shells willnot confound them. Mr. Lea considers the obliqaa of Lamarck to beidentical with undatus of Barnes, but Lamarcks de-scription is wholly inapplicable to the latter, whilstit agrees with the ebcnus of Lea, with which it isidentical, according to Ferussac. UNIO APICULATUS. Plate XLIV.—Fig. 1. DESCRIPTION. Shell subquadrate, compressed; summits not veryprominent; hinge margin declining; disks with a dilat-ed not deeply impressed furrow; umbonial slope ii £ W> \k ? \ -~\ \ f r. ?) i 1 •? MP ?y ,.-- -^ \ /? AS V-_,_^ : l^°^«^*«y^.c:f,a<t/^ li. s v
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
