2 , LAMELLIBRANCHIATA. 



ears in P. tigrinus may be fairly large, and the hindmost part of the shell may show a trace of being 

 echinated; on the other hand, the number of the spined ribs in P. striatus may be limited to two, even 

 to one along the anterior edge of the shell, whilst the whole of the remaining part of the shell in 

 form and sculpture agrees with P. tigrinus. 



Pecten striatus Muller. 



Pecten striatus Muller, Zool. Dan. II, 1788, p. 26, Tab. 60, figs. 3— 5; Jeffreys Brit.Conchol.il, 1863, 



p. 69, PI. 23, fig. 4. 

 Pecten striatus Morch, Vidensk. Meddel. Naturh. Foren. 1867, p. 98. 



At Iceland the "Ingolf Expedition took this fragile species at: 



St. 98. W. of Iceland (Brede Bugt) 138 fm. 5.9 C. 4 valves. 



- 86. - - - 



- 87. - - - 



- 6. S.S. E. of — 



- =,1. — - — 



63°i5'N.L., 22°23'W.L 170— 114 fm. 



6 3 °2i' — i7°3i' - 69 - 



63-21' - i 7 Q i5' - 58 - 



The largest of these shells is 20 nim . high. 



At the Faeroes, where it had already been noted by Morch, P. striatus has been taken at the 



following places: 



Thorshavn, outer roads 12 — 16 fm. 1 valve. 



Nolso, deep hole at uorth end ca. 100 - 1 spec. 



6i°4o' N.L, 7 D 4o'W.L 135 - 1 valve. 



16 miles E. by S. of south point 



of Nolso So - 7 spec, and 1 valve. 



Akralejte in X. 57 \Y., 12 miles - 150 - 5 valves. 



13 miles W. by S. of Munkeu - 150 - 3 — 



The largest of these shells is 22.5 mm . high. 



Distribution. P. striatus occurs in the Western Mediterranean (from Sicily) and ranges along 

 the west of Europe to West Finmarken in Norway; it goes over the Faeroes to South and South- 

 West Iceland 1 ). It enters the Kattegat as far as Hellebsek and Samso. The vertical distribution is 

 given by Jeffreys to be from 5 to 180 fm. 



Regarding its relation to P. tigrinus, see notes under the latter. 



1 The record given by Becher, that the Austrian Expedition has taken the species on the north side of Jan Mayen, 

 1 Si, in. (Osterr. Polarstat. Jan Mayen, [886, III, p. 68) is undoubtedly based on an erroneous determination. 



