CIEEIPEDIA FROM THE PANAMA CANAL ZONE. 



By Henry A. Pilsbry, 



Of the Academy of Natural Sciences, Philadelphia. 



The small number of barnacles collected show the following rela- 

 tions. The Pleistocene and Pliocene species are identical with recent 

 Atlantic coast and Caloosahatchie Pliocene species, respectively, and 

 are distinctively Atlantic forms. Of the Oligocene and Miocene 

 species, one has relatives in both oceans, another only in the Pacific ; 

 the affinities of the third being doubtful. 



BALANUS EBURNEUS Gould. 



Balanus ebumeus Pilsbky, Bull. U. S. Nat. Mus., No. 93, 1916, p. 80, pi. 24, 

 figs. 1-le, 2, text-figs. 14 and 15, and synonymy. 



This recent species is represented by four individuals from Station 

 6867, the wall being preserved complete, but without opercular plates. 

 The smooth surface and the closely, regularly septate parietal tubes 

 are characteristic, the septa forming cells about equal in length and 

 breadth, throughout the tubes. 



Locality^ and geologic occurrence. — They are from a dark mud 

 formation about 10 feet above the present sea level, near lower end 

 of Gatun Locks. Pleistocene series. D. F. MacDonald, collector. 

 April, 1911. Cat. No. 324297, TJ.S.N.M. Five specimens, from Sta- 

 tion 5868, from Mount Hope, in swamp ditch, in black mud forma- 

 tion; Pleistocene; D. F. MacDonald, 1911. Cat. No. 324290, U.S.N.M. 



Ten specimens of the same were taken at Station 6038, also from 

 black mud fromlower end of Gatun Locks. Pleistocene series. D. F. 

 MacDonald, collector, 1911. Cat, No. 324293, U.S.N.M. 



BALANUS GLYPTOPOMA Pilsbry. 



Plate 67, figs. 1-3. 



Balanus concavus glyptopoma Pilsbry, Bull. U. S. Nat. Mus., No. 93, p. 102, 

 pi. 21, fig. 2 ; pi. 22, figs. 2-2c. 



The walls only of several groups growing on oysters and scallops 

 were collected. They agree with the above species described from 

 the Pliocene of the Caloosahatchie River, and show some additional 

 characters, notably the color. The radii are broad. The parietes are 

 weakly ribbed longitudinally, the intervals in the best preserved in- 

 dividuals being of a deep livid brown color, the low ribs white. The 

 parietal tubes are crossed by many septa, down to the base; these are 

 a little less regular than in B. ebumeus, most of the cells being longer 

 8370/— 18 185 



