86 Moll. 
MOLLUSC A. 
cnsses incidentally several recent species, is mentioned above under the 
subject, “ Palaeontology of Recent Species,” p. 25. 
Nucula infiata (Hanc.), Discovery Bay, 81® N. lat. ; E. Smith, Ann. 
N. H. (4) XX. p. 141. 
Nucula ptisillaf n., Angas, P. Z. S. 1877, p. 177, pi. xxvi. fig. 26, 
Port Jackson. 
Leda 2^ernula (MuWqv) and glacialis (Leach), Discovery Bay, 81® N. 
lat., and their synonymy ; E. Smith, Ann. N. H. (4) xx. pp. 141 & 142. 
Leda Jeffrey si, new name for L. lata (Jeffr., nee Hinds) ; Hidalgo, Mol. 
mar. de Esp. pt. 13, and J. do Conch, xxv. p. 396. 
Leda ensicula[-us\ sp. n., Angas, P. Z. S. 1877, p. 177, pi. xxvi. 
fig. 27, Port Jackson, 45 fathoms. 
Yoldia. A tentacular organ on the right side, near the base of the sipho, 
described by W. Brooks, P. Am. Ass. xxiii. 1875, pp. 80-82, woodcut. 
Yoldia suhceguilateraUs (Smith, 1875) ; E. Smith, Transit Venus Exp., 
Moll. p. 21, pi. ix. fig. 18, Kerguelen Island [anted, p. 6]. 
Solenella giyantea (Smith, 1875)} id. 1. c., fig. 19, Kerguelen Island. 
Pbctinidj:. 
Pecten lividus (Lam.). On its varieties in the Red Sea ; Pagenstechei’j 
1. c. p. 29. 
Pecten puncticulatus, trifidus, and ^;<3S^CM^osws, spp. nn., Dunker, Mai. Bl. 
xxiv. pp. 71 & 72, Japan. 
Pecten [Pseudamusium) grcenlandicus (Sow.), Discovery Bay, 81 N. lat. ; 
E. Smith, Ann. N. H. (4) xx. p. 146. 
Lima japonica, sp. n., Dunker, Mai. Bl. xxiv. p. 70, Japan. 
[Limd^ B.adula {Limatula) pygmcea (Phil.), E. Smith, Transit Venus 
Exp., Moll. p. 25, pi. ix. fig. 16, Kerguelen Island [anted, p. 6]. 
Spondylus aculeatus (Chemn.). Note on its varieties in the Red Sea ; 
Pagenstecher, in Kossmann’s Zool. Ergebnisse, i. 2, p. 26. 
Spondylus pictorum (Chemnitz), from Peruvian graves; Troschel, SB. 
Ver. Rheinl. 1877, p. 158. 
Plicatula ramosa (Lam.). Note on its varieties in the Red Sea ; Pagen- 
stecher, Z. c. p. 24. 
Plicatula cuneata and rugosa, spp. nn., Dunker, Mai. Bl. xxiv. p. 73, 
Japan. 
OSTREID.®. 
Prof. Mobius has published a little book on the oyster and its breed- 
ing, chiefly with regard to the oyster beds on the western shore of 
Schleswig. He points out the obstacles which the coldness of the winter 
and the soft mobile consistence of the sea-bottom offer to any extension 
of oyster-breeding, and states that a single adult oyster produces annually 
about 440,000 young animals, but that scarcely one of these reaches 
maturity ; the number of young oysters in a bank is always less than 
that of adults, about 0.42 — 0.48, as has been found from repeated dredg- 
ings during many years. Therefore, if the take is not very moderate 
and cautious, the oysters will certainly decrease. In England and France, 
