6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



DESCRIBED SPECIES REFERRED TO ALOKISTOCARE 



Alokistocare americanum (Walcott) 



Acrocephalites americanus Walcott (part), Smithsonian Misc. Coll., vol. 64, 

 no. 3, p. 177, pi. 24, figs. 2, 2b, and possibly fig. 3, 1916. (Not 2a 

 ^ A. georgense ; 2)0=z Acrocephalops nitidaf.) 



Two and perhaps three species are included in the original cotypes, 

 and a brief examination of the nontype specimens from the locahty 

 indicates that perhaps twice that number of species occur. Conse- 

 quently, the species must be carefully discriminated and restricted to 

 the specimens conspecific with the lectotype. 



Middle Cambrian, Conasauga; (loc. 89) Livingston, Georgia. 



Lectotype. — U.S.N.M. no. 61557; paratype, no. 61559. 



Alokistocare georgense, n. sp. 



Acrocephalites americanus Walcott (part), Smithsonian Misc. Coll., vol. 64, 

 no. 3, p. 177, pi. 24, fig. 2a, possibly also 3&, 1916. (See A. americamim.) 



Compared with A. mnericanum, this species has more granules, par- 

 ticularly on the brim, and the rim is less thickened but upturned more 

 sharply than shown in the illustrations. 



Occurrence same as preceding. 



Holotype.—U.S.NM. no. 61558. 



Alokistocare althea Walcott 



Alokistocare althea Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 184, 

 pi. 25, figs. 3, 3a, 4, so, 1916. 



Middle Cambrian, Bright Angel: (loc. 74) Nankoweap Valley, and 

 (loc. 74e) near Indian Garden Springs, Grand Canyon, Arizona. 

 Cotypes. — U.S.N.M. nos. 61571-61574. 



Alokistocare subcoronatum (Hall and Whitfield) 



Concephalitcs subcoronatus Hall and Whitfield, U. S. Geol. Surv. Expl. 40th 



Parallel, vol. 4, p. 237, pi. 2, fig. i, 1877. 

 Ptychoparia suhcoronata Walcott, U. S. Geol. Surv. Bull. 30, p. 205, pi. 28, 



fig. 4, 1886; idem, 10th Ann. Rep., p. 652, pi. 96, fig. 6, 1891. 

 Alokistocare subcoronatum Lorenz, Zeitschr. deutsch. Geol. Gesell., vol. 58, 



no. I, p. 62, fig., 1906. 

 Alokistocare subcoronatum Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, 



p. 187, pi. 25, fig. 2, 1916. 



Middle Cambrian, Ute ; Blacksmith Fork Canyon, east of Hyrum, 

 Utah. 



Cotypes. — U.S.N.M. no. 15442. , : 



Alokistocare aoris (Walcott) 



Acrocephalites aoris Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 178, 

 pi. 26, figs. 3, zb, 1916. 



