.32 SYRIAN MOLLUSCAU FOSSILS. 



Gonodon i hebes, sp. nov. 



Plate IV, figs. 1 a, b, e, <l. 



Testa subqmdrata, ventricosa, crassiuscula, paulum incequilatera, rugvMs inere- 

 merrfi modicis irregularihis obducta : lotus antieum perbreve, truncatim rotundatum, 

 posticiim hngius, attum, rotundaio-angulatum, fere verticaUter truncatum : umbones 

 antemediani, turgidi, retusi, ineurvi: lunula nuUa out parva et illimitata: specimi- 

 ms viiit-i umbonum cacumina absumpta ; area UgamentaUs cardinisque pars magna 

 exesce : utriusque valves dens cardinalis anticus trigonus, robustus, lotus, superne j>ro- 

 funde concavus ; margines intus Iceves. Cetera' untie cerni mm possuni. 



Shell subquadrate, ventricose, moderately thick, somewhat inequilateral, 

 covered with irregular wrinkles of growth of inconsiderable size : anterior 

 side very short, truncately rounded, hinder side the longer, high, obliquely 

 angled by an obscure rounded nmbonal ridge, almost verticaly truncated : 

 umbones antemesial, swollen, blunt, incurved : lunule none or small and 

 undefined : tips of umbones of the single specimen decaj-ed ; ligamentary 

 area and larger part of the hinge removed by corrosion ; under the beak of 

 each valve a wide, strong triangular tooth, deeply concave above and pro- 

 longed in the direction of the longitudinal axis of the shell. The other 

 characteristic marks cannot be distinguished. 



Single specimen, with test. Length, 37 mm. ; height, 34 mm. ; thickness. 

 28| mm. 



Of the solitary example, the beaks in part, the whole area, and the greater 

 portion of the hinge have been removed by decay. Beneath the beak in 

 each valve remains a remarkably prominent triangular tooth, deeply hol- 

 lowed upon its inwardly sloping wide upper face. These teeth are quite 

 unlike any others of which I have knowledge, and it is difficult to give a 

 correct idea of them either by a figure or in words. 



The peculiar form, together with the concentrically wrinkled surface and 

 the somewhat enlarged lunular margin, indicates the relationship of this shell 

 to that group of the Lucinidce to which the genus JJrdcardium belongs. The 

 abnormal development of the two remaining hinge-teeth forbids that it 

 should be referred to any genus of that group except Gonodon. Since the 

 work* which contains Schafhseutl's original diagnosis of that genus is want- 

 ing in the libraries of Cambridge and Boston, 1 have it only as given by 



* Siid-Bayerns Lelhcea Geognostica, LS68 



