82 PALMONTOLOGY OF NEW YORK. 



Genus AULONOTRETA, Kutorga. 1848. 



1848. Aulonotreta, Kutoega. Ueber die Siphonoti-etaeae : Vei-handl. dei- Russ.-kais. Mineral. Gesellsch. 



zu St. Petereb. Jahi-g. 1847, p. 278, pi. vii, figs. 10, 11. 

 1869. Acritis, Volborth. Ueber Sclimidtia und Aci-itis, idem., 2te Ser. Bd. iv, p. 217, pi. xvii, figs. 7-9. 



The name Aulonotreta was proposed by Kutorga to take the place of 

 Obolus, Eichwald, as he deemed the latter an inappropriate name. The first type- 

 species under the description is A. polita, Kutorga, which "umfasst folgende, von 

 Professor Eichwald, aufgestellte Arten : Obolus ApoUinis, 0. Siluricus und ingricus, 

 deren unterscheidende Merkmale weder mit Worten, noch mit Zeichnungen 

 gegeben werden konnen."* As 0. ApoUinis is, however, generally recognized 

 as a well-defined species, Kutorga's first type and his genus, as far as it rests 

 on this type, became synonyms for Obolus. The second type, Aulonotreta sculpta, 

 Kutorga, is a synonym for the Obolus 

 antiquissimus, Eichwald,f and this species 

 was taken by Volborth as the type of 

 his genus Acritis.^ The species is very 

 imperfectly known. Volborth's figures 

 indicate a close agreement with Obolus ''%^ 



T ,. n J 1 1 _L p Acritis antiquissima. 



in general form, and the characters oi ^fter volborth. 



, , T 1 ml ■ 1 _L • Fig. 35. Interior of pedicle-valve. 



the cardinal area, ihe incomplete m- Fia.36. interior of brachial vaive. 



teriors figured show in the pedicle-valve, a broad, subquadrate median scar, 

 crossed on its posterior portion by a transverse band connecting what appear 

 to be cardinal scars. In the brachial valve are two subcircular scars in the 

 median region just within the posterior margin. In the event of this form 

 proving distinct from Obolus, the laws of priorit}' require that it shall bear 

 the name Aulonotreta, for which Acritis will then be a synonym. 



* Pp. 281, 282. 



t Urwelt Russl., 1843, p. 142, pi. iv, fig. 1 a, b, c. 



I Loc. cit. 



