96 Moll. 
MOLLUSCA. 
Saxicavida?. 
Glycymeris generosa (Gould). Sketches of living animals ; it sometimes 
attains the weight of sixteen pounds ; Stearns, Bull. U. S. Fish. Comm, 
iii. pp. 356-360. 
Anatinid^e. 
Thracia jacJcsonensis, sp. n., Sowerby, P. Z. S. 1883, p. 30, pi. vii. fig. 5, 
Port Jackson. 
Lyonsia arenosa var. n. sibirica , = L. gibbosa (Hancock, 1846) ; Leche, 
in Nordenskiold’s Yega Exped. Yetensk. Iakt. iii. p. 439, pi. xxxii. figs. 3 
& 4, West and East coasts of Northern Siberia. 
Kennerlia glacialis (Leach) from Labrador ; K. Bush, P. U. S. Nat. 
Mus. vi. p. 245, pi. ix. fig. 1 . 
Necera behringensis , sp. u., Leche, l. c. p. 438, pi. xxxii. figs. 1 & 2 ; near 
curia (Jeffr.), Bering Sea, 65 fath. 
PnOLADIDiE. 
Teredo navalis. Observations made at Missolunghi ; X. Nieder, Kos- 
mos, xii. p. 304. 
Teredo fuchsi, sp. n., Yassel, La Nature, No. 471, 10 June, 1882, 
Isthmus of Suez, Quaternary. 
TUBICOLA. 
H. Lacaze-Duthiers gives a very valuable anatomical description of 
Aspergillum dichotomum (Reeve), from which it appears that its funda- 
mental structure is exactly that of the other Bivalves, and even more 
normal than that of Tridacna , Anomia , or the oyster, only modified by 
the peculiar habits and the profuse secretion of calcareous matter on the 
surface. The sexes are united, the ova are probably fecundated in 
the mantle cavity. The internal gill-leaf is double, as usual, the external 
simple. Arch. Z. exper. (2) i. pp. 665-732, pis. xxv.-xxix. 
