^2 LAMELLIBRANCHIATA. 



sehr oft bedeutende Flachen von den oben erwahnten Steinhaufchen eingenomnien gesehen; in jedeni 

 derselben steckte eine lebende Mytiliis discors-Mxxs^^, ganz wie eine Puppe in ilirer Puppenhiille" '). 



Modiolaria corrugata vStimpson. 

 PI. Ill, figs. 7 a— d. 

 Modiola discors Gould [iion Linne), Rep. Invert. Mass. 1841, p. 130, fig. 84. — My f Hits cornigata 

 vStimpson, Shells of New England, 1851, p. 12. — Modiolaria corrugafa Gould and 

 Binney, Rep. Invert. Mass. 1870, p. 193, fig. 491; Sars, Moll. Reg. Arct. Norv. 1878, p. 30, 

 PI. 19, fig. 2. 

 Modiolaria corrugata Morch, Rink's Gronland, 1857, p. 94; Arctic J\Ianual, 1875, p. 133; Rink's Danish 

 Greenland, 1877, p. 442; Posselt, Medd. om Gronland, XXIII, 1898, p. 23 (partini). — Alodi- 

 olaria nigra Walker (iioii Gray), Journ. Roy. Dublin Soc, vol.3, i860, p. 70. 



At West Greenland this species is not common according to Posselt. In this I can confirm 

 Posselt and I even believe, that it is more rare than he thought, as he has in several cases 

 confused Modiolaria nigra with the present species. Specimens which are certainly M. corrugata 

 I have seen in the Copenhagen and Stockholm Zoological Museums from the following West Green- 

 land localities: Plskeuses, 70 fm., shell bottom; Godthaab, 50— 6ofm.; Disco, Harungen, 160 fm., clay 

 bottom; Godhavn, 70 fm., clay bottom; Umanak, 12 fm. and 25 — 35fm., stony bottom; N. W. of Cape 

 York, 5— i2fm., sand mixed with clay. From each locality there is only one or a couple of specimens. 

 According to Jeffreys'), the so-called "Modiolaria nigra" taken by the "Fox" at Cape York and Port 

 Kennedy belong to this species. — The largest Greenland .specimen which I have seen is 15.75 "'"'• long. 



[At East Greenland M. corrugafa is stated to have been taken by the Swedish Exped. of 

 1900, according to R. Haggj); I have had the opportunity of seeing the specimens in question and 

 found, that they were in reality the two varieties Icrvigata Gray and substriata Gray of Modiolaria 

 discors L,. M. corrugata has thus not yet been found on the east coast of Greenland]. 



[On the north side of Jan Mayen the Austrian Polar Station is said to have taken 2 specimens, 

 according to Becher^), but we do not know, whether the determination was correct]. 



[That Mod. corrugata occurs at Iceland, as stated by VerkriizenS), I consider as more than 

 doubtful; the species is not represented in the systematic collections made from the Danish side. I 

 imagine, that the specimens Verkriizen obtained at Reykjavik by dredging in July 1872, were 

 M. discors var. substriata]. 



Distribution. In addition, we have more or less certain records that Modiolaria corrugata 

 lives at Spitzbergen, ca. 372— 63 fm. (Torell, Knipowitsch) and at Finmarken, 20 — 50 fm. (Sars), in 

 the Kara Sea, 20 — 78 fm. (Collin), in the Polar Sea of Siberia, 9—12 fm. (Lechei, in the Bering Sea, 

 i5-2ofm. (Krause) and on the north-east coast of America down to Cape Hatteras (Dall). 



') Amtl. Bericht uber die 24. Versamml. Deutscher Naturf. uud Aerzte in Kiel, 1S47, p. 222. 



2) vScient. Proceed. Roy. Dublin Soc, N. S., II, 1S80, p. 12S. 



3) R. Hagg, Arkiv for Zoologi, Bd. 2, No. 2, 1904, p. 22. 



4) Becher, Osterr. Polarst. Jan Mayeu, III, 1SS6, p. 69. 



5) T. A. Verkruzen: Dredging-Excursion to Iceland. Ann. Mag. Nat Hist. 4 ser. Vol. X, 1S72. p. 372. 



