Portugal og Nordafrika indtil Cap Verd. 
den tagen i Middelhavet og paa talrige lokaliteter udenfor 
Nordamerikas østkyst mellem Nova Scotia og Cape Hat- 
teras. Den bathymetriske udbredelse er 135—1702 fy. 
Ligeledes er 
Spain, Portugal, and the north of Africa down to Cape 
Verd. It has also been found in the Mediterranean, and 
in numerous localities off the east coast of North America 
between Nova Scotia and Cape Hatteras. Its bathy- 
metrical distribution is from 135 to 1702 fathoms. 
Malletia cuneata, Jeffreys. 
Solenella cuneata, Jeffreys, Rep. Brit. Assoc., 1873, p. 112. 
Malletia — 
Findested. 
1833—1861 fy. 
Denne dybyandsart er kun kjendt fra de store At- 
lanterhavsdyb. Nordgrændsen for artens udbredelse er ved 
Spitsbergen og mundingen af Baffinsbugten; mod syd gaar 
den til troperne. Desuden er den funden paa flere lokaliteter 
i Middelhavet. Den bathymetriske udbredelse er 295— 
2260 fv. 
Stationerne 52, 183, 213 og 353. Dybde 
Jeffreys, Ann.-& Mag. Nat. Hist., ser. 4, vol. 18, 1876, p. 435. 
Jeffreys, Proc. Zool. Soc, 1879, p. 586, Pl. 40, fig. 10. 
Locality. Stations 52, 183, 213 and 353. Depth 
1833—1861 fathoms. 
This deep-water species has only been found in the 
great depths of the Atlantic. The northern limit of its 
distribution is off Spitsbergen and at the mouth of Baffin's 
Bay; southwards it extends to the tropics. It is also found 
in several places in the Mediterranean. Its bathymetrical 
distribution is from 295 to 2260 fathoms. 
Yoldia hyperborea, Lovén. 
Yoldia hyperborea, Lovén, Torell, Spitzberg. Moll, 1859, p. 149, Pl. 2, fig. 6 ab. 
Vi har hayt anledning til at sammenligne Nordhays- 
expeditionens materiale med typiske exemplarer af de 
am erikanske former yoldia limatula, Say og yoldia sapo- 
tilla, Gould samt med Sars's yoldia limatula og Torells 
originalexemplar af yoldia hyperborea. At domme efter 
dette materiale synes yoldza sapotilla at slutte sig nær 
yoldia hyperborea, dog er hos denne nebbet afrundet 
medens det hos yoldia sapotilla er mere skraat af- 
skaaret. I skallets veekstlinier træder denne forskjel 
tydelig og skarpt frem (cfr. Gould, Rep. on Invert. of 
Massachusetts, ed. 1, 1841, fig. 61). Emdvidere synes 
yoldia hyperborea at have flere laastænder, vi har hos denne 
fundet 22—26/16—22, medens yoldia sapotilia blot har 
16—18 paa hver side. Forøvrigt afviger disse to former 
ikke fra hinanden, hos dem begge er saaledes skallets høide 
lig eller noget større end den halve længde. 
I modsætning til Verrill, der betragter Sars's Wmatula 
for identisk med hyperborea, Lovén, men. forskjellig fra 
limatula, Say '), kan vi ikke opdage nogen væsentilig forskjel 
mellem den norske og den amerikanske form, kun synes 
den sidste at have noget færre laastænder, 22/18, men 
dette antal kan dog ogsaa findes hos den norske. Yoldia 
limatula, Say, har den samme langstrakte form som Sars's, 
hos dem begge er skallets høide mindre end den halve 
længde; kun hos ganske unge exemplarer er den lig. 
1) Trans. Connecticut Acad., vol, 6, 1884, p. 226. 
Leche, Vega Exp. Vetensk. Iakttag., vol. 3, 1883, p. 444, Pl. 33, figs. 16, 17. 
We have had an opportunity of comparing the 
specimens from the North Atlantic Expedition with 
types of the American Yoldia limatula, Say, and 
Yoldia sapotilla, Gould, and with Y. hyperborea, Lovén, 
from Spitsbergen (original specimen from Torell), and 
Y. limatula, G. O. Sars, from various localities of northern 
Norway. From this it appears that Y. sapotilla is nearly 
allied to Y. hyperborea, though the beak in the latter is 
rounded, while in Y. sapotilla it is more obliquely truncated. 
In the lines of growth this difference is very marked (cf. 
Gould, Rep. on Invert. of Massachusetts, Ist. ed. 1841, 
fig. 61). Y. hyperborea, moreover, appears to have a greater 
number of hinge-teeth; we have found 22—26/16—22, 
while Y. sapotilla has only from 16 to 18 on each side. 
In other respects, these two forms do not ditter from 
one another. The height of the shell, for instance, in both 
of them, is equal to, or rather more than, half the length. 
Unlike Verrill, who regards Sars's limatiula as iden- 
tical with Lovén's hyperborea, but different from Say’s 
limatula'), we can discover no essential difference between 
the Norwegian and the American form, except that the 
latter appears to have rather fewer hinge-teeth (22/18); 
but the same number ean also be found in the Norwegian form. 
Y. limatula, Say, has the same elongated form as that of 
Sars; in both of them the height of the shell is less than 
half the length. Only in quite young specimens is the 
height equal to half the length. 
1) Transac. Connecticut Acad, vol. 6, 1884, p. 226. 
