338 



Var. inflata Hägg. 



Ästarte cretiata Gray var. iiifata п. siibsp. Hägg, Arkiv 

 for Zoologi, Bd. 2, Nr. 2, 1904, p. 37, Taf. I, Fig. 4—6. 



The shell is ventricose and approaches the oblique square, 



the upper and lower margin are almost parallel, the anterior end 



short, rounded, the posterior end truncate. The concentric ribs 



are generally rather numerous and well-developed, sometimes 



however less conspicuous or even effaced on a smaller or larger 



part of the shell (very rarely even quite wanting, so that the 



shell only shows a fine striation). The periostracum is yellow 



or brownish yellow. The maximum length is 19 mm. 



1900. Forsblad-Fjord ca. 50 Cms. Clay with stones 5 specimens. 



1900. Forsblad-Fjord 90—50 — Clay with stones Numerous — 



1891 — 92. 74° 17' N. 15° 20' W. 127 — Clay with stones 2 specimens. 



The number of ribs may increase up to ca. 40 and de- 

 crease to ca. 24 or still fewer as the umbonal part frequently is 

 without folds, and quite smooth specimens may, as mentioned 

 before, also occur. 



Some measurements will show the variation-limits, from the 

 oblong-trapeze shaped to the almost quadratic, and the more 

 or less ventricous : 



Length. 



Height. 



The heiglil . 

 in o|„of the 

 leiigtli. 



Breadth. 



The breadth 



ino/oofthe 

 length. 



19 mm. 



14*5 mm. 



76-3 



10 mm. 



52-6 



16-5 — 



11-75 — 



71-2 



9-2 — 



55-8 



15-25— 



12 — 



78-7 



8-5 — 



55-7 



15 — 



11 — 



73-3 



7-3 — 



48-7 



Var. acuticostata Jelfreys. 



Ästarte acuticostata Jeffreys M. S., Friele, Nyt Mag. f. 

 Naturvidensk. 23. Bd. 1877, 3. Hft., p. 1 ; ibid. 24. Bd. 1879, 

 p. 223; Jeffreys, Proc. Zoo!. Sec. 1881, p. 711, PI. 61, Fig. 9. 



The shape takes form of a shorter or longer oblique square, 

 more or less ventricous; the concentric ribs are numerous (ca. 

 25—40), well developed, more or less sharp, partly laminar and 

 imbricated. The maximum length is 13 mm. 



