13 



Portugal og Nordafrika iiultil Gap Verd. Ligeledes er 

 den tågen i Middrlhavet og paa talrige lokaliteter udenfor 

 ^Nordamerikas ostkyst inelleni Nova Scotia og Cape Kat- 

 teras. Den liathymetriske udbredelse er 135 — 1702 fv. 



iSpain, Portugal, and tlie nortli of Africa down to Cape 

 Verd. It has also been found in the Mediferi-anean. and 

 in numerous localities off the east coast of Xorth America 

 hetween Nova Scotia and Cape Hatteras. It.s bathy- 

 metrical distributioii is from 135 to 17n2 fathoni.s. 



Malletia cuneata, Jeffreys. 



So1e)ieUa ciiiæaia, Jeffreys, Eep. Brit. Assoc, 1873, j). 112. 



Malletia — Jeffreys, Ann. & Mag. Nat. Hist., ser. 4. vol. IS, 1S7G. p. 435. 

 — — Jeffreys, Proc. Zoo). Soc , 1879, p. 586. Pl. 40. tig. lU. 



Findested. Stationerne 52, 183, 213 og 353. Dybde 

 1333^l8(il fv. 



Denne dybvandsart er kun kjendt fra de store At- 

 Innteriiavsdyb. Nordgrændsen for artens udbredelse er ved 

 Spitsbergen og nnindingen af Baffinsbugten ; mod syd gaar 

 den til troperne. Desuden er den funden paa Uere lokaliteter 

 i Middeliiavet. Den liathy metriske udliredelse er 295 — 

 2260 fv. 



Iiocality. Stations 52, 183, 213 and 353. I)<>])th 

 1333—1861 fathoms. 



This deep-w;iter species has only ])een found in the 

 great deptbs of tiie Atlantic. The northern limit of its 

 distribution is off Spitsbergen and at tii« mouth of Baftin'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, Loven. 



Yohlia hyperhorea. Loven, Torell, Spitzberg. Moll. 1859. p. 149, Pl. 2, fig. 6 a— b. 

 — ^ - Leche, Vega Exp. Vetensk. lakttag., vol. 3, 1883, p. 444, Pl. 33, figs. 16. 17. 



;inledning til at sammenligne Nordhavs- 



Vi har iiavt 



expeditionens materiale med typiske exemplarer af de 

 amerikanske former yoldia linuifula. Say og yoldia mpo- 

 tilla, Gould samt med Sars's yoldia limutidu og Torells 

 originalexemplar af yoldia hyperhorea. At domme efter 

 dette materiale synes yoldia sapolilla at slutte sig nær 

 yoldia Jiyperliorea, dog er hos denne næbbet afrundet 

 medens det hos yoldia sapotilla er mere skraat af- 

 skaaret. I skallets vækstlinier træder denne forskjel 

 tydelig og skarpt frem (cfr. Gould. Rep. on In vert. of 

 Massachusetts, ed. 1. 1841, fig. 61). Endvidere synes 

 yoldia hyperhorea at have flere laastænder, vi har hos denne 

 fundet 22 — 26/16 — 22, medens yoldia sapotilla lilot har 

 16 — 18 paa hver side. Forøvrigt afviger disse to former 

 ikke fra hinanden, hos dem begge er saaledes skallets hoide 

 lig eller noget storre end den halve længde. 



I modsætning til Verrill, der betragter Sars's liiiiatala 

 for identisk med hyperhorea, Loven, men forskjellig fra 

 limatula, Say'j, kan vi ikke opdage nogen væsenthg 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 tindes hos den norske. Yoldia 

 limutida. 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. 



Trans. Connecticut Acad.. 



18S4, p. -l-HS. 



We have bad an opportunity of comparing tlie 

 specimens from the North Atlantic Expedition with 

 types of tlie American Yoldia limatnla, Say, and 



Yoldia sapotilla, Gould, and with I', liyperhorea, Loven, 

 from Spitsbergen (original speciraen from Toi-ell). and 



Y. limatula. G. 0. Sårs, from various localities of northern 

 Norway. From this it appears tiiat 1'. sap<itillu is nearly 

 allied to Y. hyperhorea. though the beak in the latter is 

 rounded, while in Y. sapofilla it is more obliquely truncated. 

 Ill the lines of growth this difference is very marked (cf. 

 Gould, Rep. on Invert. of Massachusetts, Ist. ed. 1841, 

 fig. 61). Y. hyperhorea. moreover. appears to have a greater 

 nuniber of hinge-teeth ; we have found 22 — -26/16 — 22, 

 while Y. sapof/lla has only from 16 to 18 on each side. 

 In other respects, these two forms do not difter from 

 one another. The height of the shell, for instance, in botli 

 of them, is equal to. or rather more tlian, lialf the length . 

 Unlike Verrill. who regards Sars's limatnla as iden- 

 tieal witli Lovén's hyperhorea, but different from Say's 

 liiiiatala''), we can discover no essential difference between 

 the Norwegian and tiie American form, except that the 

 latter appears to have rather fewer hinge-teeth (22/18); 

 lint the same number can also be found in the Norwegian form. 

 Y. Umattda, Say, has the same elongated form as that of 

 Sårs; 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 lialf the length. 



') Transac. Connecticut Acail , vol. (i, IHs-l, p. 22(i. 



