290 
ZOOLOGICAL LITERATUHE. 
Cyrena cordata (Wiegmann in Mus. Berolin.), Martens, Mai. Blatt. xii, 
p. G5, Mexico. 
Corhicula. Mr. Prime, Ann. Lyc. Nat. Hist. New York, viii. 1864, p, 67, 
has described and figured the following species : — C, pexatUj mullerianaj 
chemnitziana, from China ; C. leana and japonica, from Japan j C. kviusctda, 
from Cochinchina j C. lamarcktana, linneana^ hlandiana^ from Cambodia j 
C. rhomloidea, from Malacca j C. sayu7ia, a'cssemia, venushda, from the Phi- 
lippines ; C. suh'adiataj agrensis, parvula, from British India j C. purpurea^ 
from the Biver Tigris ) C. kit'kii, from Mozambique j C. incBquilatoraliS) from 
Africa ; C. minor, from New Holland j C. hrunnea, from Tasmania j C. solk 
dula, locality unknown. 
Cyrena (^Corhicula) hocourti and C. (C.) castanea, sp. n., Morelet, Journ. 
Conch, xiii. p. 228, Cochinchina. 
Batissa solidula, sp. n., Prime, 1. c., locality unknown. — B. teneh'osa, var. 
parallela, Mousson, Journ. Conch, xiii. p. 207, Feejee Islands. 
Bph(Brium ddingoli (Prime) = Cyclas calycidata of some authors, and S. 
ovale (Ferussac), both from Algeria, are described and figured in Bourguignat’s 
Malacol. Alg^r. ii. pp. 274-276, pi. 17. figs 1-9 and 10-13. 
Bisidium novozelandmcm, sp. n.. Prime, 1. c., New Zealand. 
Stepanoff, P. Ueber die Geschlecbtsorgane mid die Ent- 
wicklung von Cyclas. Wiegm. Arch. Ntrgesch. xxxi. pp. 
1-32, with two plates.' 
[On the generative organs and development of Cyclas^ 
Sph(Erium,~\ 
These investigations have been made under the guidance of 
Prof. Len chart, and confirm the hermaphroditism of this genus. 
Spermatozoa and ova are formed in the same gland during the 
whole summer, from May to August. The ova are developed 
in special generative sacs (Brut-taschen) situated on the inner 
wall of the branchia. The velum is less developed than in ma- 
rine mollusks. The young very soon leave the ova, and remain 
for a long tipae between the branchiae of the parent. The degrees 
of union of the lobes of the mantle and the formation of the 
siphons (characters used by Cuvier for the primary division of the 
bivalves) are shown to belong to the last stage of development 
in these mollusks, the siphons attaining to their relatively full 
length only after the young animal has entered upon the period 
of independent life. 
Cardiid^. 
Cardivm hellei'i, Brusina, Verhandl. zool.-bot. Gesellscli. Wien, 1866, p. 36, 
Zara, Dalmatia j closely allied to C.parvxmi (Phil.). 
TrIDACNID^E (CHAMiETRACHiEID^.) 
Vatllant, LfroN. Becherches sur la famille des Tridacnides. 
Ann. Sc, Nat. 1865, iv, pp. 64-172, with plates 8-12. 
