30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



DESCRIBED SPECIES REFERRED TO GLOSSOPLEURA 



The four species from Greenland described by Poulsen appear to be 

 typical of the genus. 



Glossopleura boccar (Walcott) 



Dolichomctopns boccar Walcott (part), Smithsonian Misc. Coll., vol. 64, 

 no. 5, p. 363, pi. 52, fig. irt, \c, ic, 1916. (Not fig. I =^ G. stephencnsis; 

 fig. ib = G. bosivorthensis ; figs. \d, if=G. nifida.) 



Glossopleura boccar Poulsen, Meddels. Grjzinland, vol. 70, p. 268 (gen. ref.), 

 1927. 



It appears that four species are represented among the figured 

 specimens of D. boccar, consequently one form must be chosen as the 

 species, in order that the genotype of Glossopleura can be understood. 

 Keeping in mind Walcott's habit of always writing the type locality 

 first, and the statement he makes on page 363 that D. boccar is from 

 the Mount Bosworth section, we may at once conclude that the latter 

 is the type locality and hence choose the types of D. boccar from the 

 illustrated specimens of locality 57g. This leads us to use figures la, 

 ic, le, as the cotypes of G. boccar. Figure la shows the cranidial 

 features imperfectly, first, because in the specimen the frontal ex- 

 tension of the glabella is bent down by rock folding, and second, the 

 photograph was cut ofif too short. Examination of the specimen, how- 

 ever, reveals that its glabella is essentially like that of Figure ic. 



The specimens not illustrated from other localities referred to the 

 species with more or less reservation represent new forms. Numerous 

 unworked collections have been made from this zone, and it is pos- 

 sible that the species may be found in them, but a cursory study indi- 

 cates that most belong to new forms. 



Description. — Head and tail of even size, semicircular in outline. 

 Glabella nearly rectangular, but slightly constricted behind the center ; 

 glabellar furrows faint. Fixed cheeks practically confined to the palpe- 

 bral lobes ; none in front of the eyes. Eyes long and situated far back. 



Thorax with seven segments. 



Pygidial axis rather high and well marked by the dorsal furrow. 

 Five or six axial furrows distinguishable. Doublure wide, and when 

 pressed against test, makes a well-defined border ; otherwise the 

 pleural lobes slope rather steeply down to the margin all around. 

 Pleural furrows traceable but not deep. 



Middle Cambrian, Stephen; (loc. 57g) Mount Bosworth, British 

 Columbia. 



Cotypes. — U.S.N.M. nos. 62703, 62705, 62707. 



I 



