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BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Therefore it might seem from the incomplete evidence that 

 d'Orbigny's P. vulgaris might possibly be the same as P. acervalis of 

 Brady, and if so, would necessarily be used instead of acervalis for 

 this species. The only means of really settling the problem would be 

 the examination of the type specimens of P. vulgaris if they are 

 extant, but the problem is here raised for consideration. 



The original figures of this species given by d'Orbigny show an 

 irregularly spiral test not unlike that figured in the Cuban monograph 

 as P. vulgaris. The specimens, however, are not as regular as that 

 figured by d'Orbigny, but they show a distinct spiral tendency that 

 is evidently not the same as the one referred here to P. acervalis. 

 Such specimens are similar to the figure given by Goes,^^ which he 

 referred in 1896 to P. mediterranensis instead of P.farcta, var. vulgaris, 

 the name used in 1882. This species is far less common than P. 

 acervalis in the region, occurring at but one station, and there rarely. 



It has not been possible to solve this problem further than given 

 above. More material is available, but the type specimen of P. vul- 

 garis must be seen if it is still extant. This will easily settle the 

 problem. 



In material from off the coast of Florida and elsewhere, there is a 

 tendency for certain specimens to become built up on both sides, and 

 to assume the condition usually seen in Acervulina. 



Planorhulina acervalis — Material examined 



Genus PLANORBULINOIDES Cushman. 1928 



Planorbulinoides Cushman, Contr. Cushman Lab. Foram. Res., vol. 4, 1928, 



p. 6; Special Publ. No. 1, 1928, p. 327. 

 Planorhulina (part) Parker and Jones, 1865. 



Genoholotype. — Planorhulina retinaculata Parker and Jones. 

 Test attached, in the early stages similar to Planorhulina but the 

 later chambers spreading, becoming elongate and more or less sepa- 



«» Kongl. Svensk. Vet. Akad. Handl., vol. 19, No. 4, 1882, pi. 97. fig. 227. 



