86 Moll, 
MOLLUSCA. 
Area nodulosa (Miill.), pectanculoides (Scaochi), var. u. septentrionalis, 
and A. glacialis (Gray) ; Sars, 1. c. pp. 42 & 43, pi. iv. figs. 1-3. 
[Pectunculus~\ Area scripta (Born), perhaps only a worn specimen of P. 
pilosus ; Brauer, SB. Ak. Wien, Ixxvii. Abth. i. p. 134. 
Limopsis minuta (Phil.) = borealis (Woodw., Jeffr.), Lofoden Islands, 
400 fath. ; Sars, 1. c. p. 44, pi. iii. fig. 5. 
NuCULIDiE. 
Nucula tumidula (Malm), tenuis (Mont.), var. n. expansa and delphin- 
odonta (Mighels) ; id. 1. c. pp. 33-35, pi. iv. figs. 5, 6, & 4. 
Nucula micanSf sp. n., Angas, P. Z. S. 1878, p. 864, pi. liv. fig. 16, South 
Australia. 
Leda pernula (Miill.), Novaya Zemlya, fossil specimens passing gradu- 
ally into buccata (Steenstrup) ; Leche, Sv. Ak. Handl. xvi. (2) pp. 27 
& 28. 
Leda {Adrana) newcombi^ sp. n., Angas, P. Z. S. 1878, p. 314, pi. xviii. 
figs. 16 & 17, Aspinwall. 
Portlandia arctica (Gray), lucida (Lov^n), intermedia (M. Sars), tenuis 
(Phil.), lenticula (Moller), and frigida (Torell) ; Sars, 1. c. pp. 37-40, 
pi. iv. figs. 7-10. 
Yoldia hyperborea (Lov4n), arctica (Gray), pygmcea (Munst.), var. gib- 
bosa (Smith) = abyssicola (Torell), intermedia (Sars), var. u. major^ 
frigida (Torell) = nana (Sars), and an allied probably now form, all from 
Novaya Zemlya ; Leche, 1. c. pp. 22-26, the three last, pi. i. figs. 6-7. 
Yoldia pygmcea^ var. n. symmetrica^ Friele, Nyt. Mag. Naturvid. 1878, 
Jan Mayen Island. 
Yoldia angulata, sp. n.. Martens, SB. nat. Fr. 1878, p. 135, Western 
Africa, 10® N. lat., 17° W. long., 360 fath. 
Malletia obtusa (M. Sars), Lofoden, 300-400 fath.; Sars, 1. c, p. 41, 
pi. xix. fig. 3. 
Pectinid^. 
Pecten. Many species have three impressions in the left valve, the 
posterior adductor pedis being onlyfdeveloped in one side ; in P. jaco- 
bceus and m.aximus (L.), subgenus Vola, it is wanting on both sides. 
Ihering, Z. wiss. Zool. xxx. suppl. p. 21, pi. ii. fig. 7. Note on the 
swimming of Pecten, the hinge part being directed backwards, because 
the water is driven out at the little gaps near the hinge ; id. 1. c. p. 17, 
pi. ii. fig. 8. 
Pecten maximus (L.). Physiological observations on it by Coutance 
(see in the general subject, supra, p. 9 ; structure of the eyes, Hensen, 
supra, p. 11). 
{Pecten) Ostrea coarctata (Born, 1778) = P.flexuosus (Poli) ; Brauer, 
SB. Ak. Wien, Ixxvii. Abth. i. p. 138. 
Pecten aratus (Gmelin) = sulcatus (Miill.), with var. n. crebricostata, 
Lofoden Islands, 100-300 fath. ; G. O. Sars, Moll. arct. Norveg. p. 17, 
pi. ii. fig. 3. 
