564 Karl A. Grönwall. 



down lo the front-line; the margins of the sinus towards the lateral 

 portions of the valve are not quite sharp, but the sinus retains 

 approximately the same width on the anterior two-thirds of the 

 valve, increasing somewhat in depth, however. In the sinus there 

 are visible 6 ribs. On the lateral portions there are about 25 fairly 

 coarse ribs, irregularly in direction, which decrease in distinctness 

 and strength outwards. On the anterior portion of the valve, new 

 ribs intercalate between the older ones, and the ribs are indistinctly 

 united into 5 bundles, which also grow less distinct outwards. In 

 one or two places, the ribs are intersected by ridges of grow'th, and 

 in these places the irregularity of the ribs becomes still clearer. 



Dimensions: Length 36 mm., width 41 mm., length of hinge- 

 line 34 mm., height of area about 10 mm. 



Our form differs from Sp. daplicicosta Phill. as figured by David- 

 son, by the height of the cardinal area and the great projection of the 

 umbo beyond the hinge-line, while it is distinguished from Sp. 

 Wynnei Waag. by its greater width and by the sculpture, Sp.Wyn- 

 nei having more regular ribs, which are not united into bundles. 

 Here it should be noted that Diener (1897 Part III. PI. 7, Figs. 

 1 — 4) figures specimens of Sp. Wynnei from the Himalayas which 

 have a lesser width than Waagen's Sp. Wynnei, and he remarks 

 that, in some few specimens, the shell is as high as it is broad, 



N:o 6. Spirifer cfr. striatus Martin. 



PI. XXVII, Figs. 12—13. 



For synonyms see Tschernyschew, 1902, p. 137. 



A little specimen of a Spirifer, found free-lying at the Eskimo 

 dwelling-place at Sophus Miiller's Naze {N:o 179) must, in spite of 

 its small size, be proximately referred to Sp. striatus, as it presents 

 definite differences from other species belonging to the same group, 

 such as, Sp. fasciger Keys., Sp. cameratiis Mort., Sp. Marconi 

 Waag., etc. 



Dimensions: Length 18 mm., width 25 mm. 



The form of the shell, with the umbo projecting beyond the 

 hinge-line, the circumstance that the sinus (which, however, is less 

 accentuated than is usually the case with Sp. striatus) passes, with- 

 out a sharp limit, into the lateral portions, and the character of the 

 sculpture, in which the very fine ribs, about 10 in the sinus and 

 15 on each side, are indistinctly gathered into bundles, are all cha- 

 racteristics that refer this specimen to Sp. striatus. 



Our specimen agrees fairly well with younger specimens from 

 the Mountain Limestone of England, shown by Davidson in PI. 2, 



