I. AMhl.I.IHkWCIli VTA 2 g 



Sars is only a variety of P.vitreus Chemn. 1 ) On the one hand, there are all transitions from the densely 

 scaled to the perfectly smooth specimens; on the other, we find specimens which have just as thin valves 

 and just as small ears as P.abyssorum in combination with a sculpture such as we find in P. vitn 



Distribution. The investigations of the "Ingolf" show that Pecten vitrcus does not enter into 

 the "cold" area, but keeps to places with positive bottom-temperature (2.4 6° < outhern part 



of the Davis and Denmark .Straits, also south round Iceland over to the Faeroes, in 136 fm. 2 ) 



On the European side the species ranges from Lofoten along the Norwegian coast, 50 — 650 fm 

 into the northern part of the North Sea, ca. 150 fm. ("Thor") and down into the Skager Rak, ca. 240 

 35ofm. ("Thor"). Further, it occurs between the Fseroes and Hebrides, 229—050 I'm. ("Lightning"), off 

 the west coast of Ireland, France and the Pyrenean Peninsula, 90 — 994 fm. ("Porcupine"), in the I!a\ 

 of Biscay, ca. 340 — 895 fm. ("Caudan"), N. of the Azores, 2240 fm. ("Travailleur-Talisman"), at the 

 Azores, ca. 445 — 840 fm. ("Princesse Alice")3), at the Canaries and W. of Morocco and Soudan, ca. 85— 

 1100 fm. ("Travailleur-Talisman"), Sargasso Sea, 1650 fm. (id.) as also in the Mediterranean (to Sicily). 

 In the Western Atlantic it occurs off Nova Scotia and Newfoundland, 57 — 400 fm. and further south 

 as far as Florida, going down to a depth of 1537 fm. off Chesapeake Bay (Verrill). It has also been 

 taken off the west coast of Patagonia, 140 — 400 fm., at the Philippines, 100 — 700 fm. and at the south 

 of Japan, 345 fm. ("Challenger"). 



Pecten similis Laskey. 

 Pecten similis Laskey, Mem. Wern. Soc. I, 1811, pi. 387, pi. 8, fig. 8; Jeffreys, Brit. Conchol. II, 1863, 

 p. 71, PL 23, fig. 5. 

 At Iceland the "Ingolf" has taken this species at: 



St. 98. W. of Iceland 138 fm. 5.9 C. 8 valves 



. 86. - - — (Brede Bugt) 76 - 6 



- 87. - - — — j 10 - 1 — 



- 85. S.W.- — 170 - 1 spec, and 15 valves. 



- 6. S.E. - - 90 - 7-<J° C. 3 



The largest of these specimens (St. 98) measure: length 7""", height 6.2 



Further, P. similis has been taken S. of Iceland at 

 63° 15' N. L., 32° 23' W. L. 170 — 114 fm. Numerous spec, 



as well as at the following places at the Faeroes: 



Klaksvig 10 — 15 fm. 2 valves. 



Fundiiigsfjord 12 — ca. 20 - coarse sand 23 



Vestinanhavn 5—6 - fine black sand 



6] 40' N. L., 7 40' W. L. 135 - 5 



') In his great work on the Mollusca from the "Exped. scient. dii Travailleur el 1U1 Talisman" (T. II, 1S9S, ; 

 A.IyOCard maintains the opposite view. 



2) Posselt records a specimen from Sukkertoppeii (almost in the same latitude as St. 28 of the "Ingolf") at 15 

 20 fm., lint the specimen has certainly not been living at this shallow depth. 



,1 It can be seen from the figures, that Chlamyi 1 hip ■ Dautzenberg and l-'ischer il c.) is identical with the 

 pi esent species. 



