586 
ZOOLOGICAL LITERATURE. 
Petricola divaricata (Chemn.), Martens in V. d. Decken’s Reisen in Ost- 
Afrika, iii. p. 06, pi. 3. fig. 3. 
^ CyRENIDAS (CoiimCULIDAS). 
In his catalogue of recent species of CorbiculidcB, published 
as appendix to the Am. Journ. Conch, vol. v. part 2, T. Prime 
enumerates, in alphabetical order, with quotations of figures 
and synonyms, 107 species of Corbicula^ 30 of Batissa, 3 of 
Veloritaj HI of Cyrena, of SphcBrium [Cyclas], and 46 of 
Pisidium. The species eliminated from the genera are also 
mentioned. 
Cyrena protexta, sp. n., Conrad, Am. Journ. Conch, v. p. 107, Tampa Bay, 
Florida. 
Cyrena variegata (Orb.) = /5nosa (Maton); C. obsoleta (Desh.) perhaps = 
paranensis (Orb.). Martens, Mai. Bliitt. xvi. p. 86. 
Cyclas lacustris (MiilL). The auditory sac and its contents are described 
by Gulliver, Journ. of Anat. and Physiol, v. pp. 79-81, pi. 2. fig. 3. 
Cyclas lauricochce, sp. n.. Lake Lauricocha, near the sources of the Amazon 
River, and C,forhesii^ sp. n.. Lake Titicaca. Philippi, Mai. Blatt. xvi. p. 41, 
and Pfeiffer’s ISfovitat. iii. p. 489, pi. 105. figs. 12-14 and 16-17. 
CARDIIDiE. 
Cardium. Dr. E. Roemer distinguishes the following sub- 
genera : — 
1. Tropidocardmm, type C. costatum (L.). 
2. Acanthocardium, type C. aculeakmi (L.). 
3. Cerastoderma (Poli, Morch), type C. edule (L.). 
4. Tr achy cardium (Morch), type C. isocardia (L.) 
6. Pectuncnlus (Adanson, Morch), type C. asiaticum (Briig.). 
6. Papyridea (Swains.), type C. bullatum (Chemn.). 
7. Lcevicardium (Swains.), type C. serratum (L.). 
8. Serripes (PQc\i),iy^Q groenlandicum (Chemn.). 
9. Fragum (Bolten), type C. tmedo (L.). 
10. Corculum (Bolten), type C. cardissa (L.). 
11. Lumdicardia (Gray), typo C. retusum (L.). 
Seventy-three species are accurately described and most of 
them well figured by E. Roemer in the continuation of the 
work of Martini and Chemnitz, edited by Kiister, section 57, 
pp. 13-120, pis. 2-14. 
Th. Graham-Ponton (Journ. Conch, xvii. pp. 217-225) 
proposes for the genus Cardium the following sections : — 
A. Typical — Cardia costata (L.) and hians (Brocchi). 
B. Suhtypical — 1. Rugosisculptio : acxilcata isucardia (L.), &c. 
2. La3visculpta3 : Icevigata (L.), &c. 
3. Lyrasculptte : pectinatu (L.) and lyrata (Sow.). 
