UNIONID^. 
171 
Anodonta. Clessiii has observed A. cygnea, on being placed 
in a newly made pond, change itself into the form piscinalis, 
generally considered a distinct species. Ber. Ver. Augsb. xxi. 
p. 114. 
MYTILIDiE. 
Mytilus eduUs : its locomotion by climbing described by Lockwood, Am. 
Nat. iv. p. 331. For some notes concerning its varr. incurvatm (Penn.) and 
imgulatus (L.), cf. Fischer, Act. Soc. L. Bord. xxvii. p. 95. 
Mytilus gray anus (Diinker, 1853) = dunkeri (Reeve, 1867) : Lischke, J. M. 
Conch, ii. p. 145. 
Mytilus atratus, sp. n., id. Mai. Bl. xviii. p. 44, and J. M.-Oonch. ii. p. 140, 
pi. 10. iigs. 4& 5, Nagasaki. 
Modiola plicatula (Say) : its walking described by Lockwood, Am, Nat. iv. 
p. 331. 
Modiola auriculata (Krauss), from E. Africa, also received from Kingsmill 
I. : Martens & Langkavel, Don. Bism. p. 63. 
Modiola semivestita, sp. n., Bunker, Mai. Bl. xviii, p. 173, St. Vincent, 
Australia. 
[^Modiola] Perna confusa, sp. n., Angas, P. Z. S. 1871, p. 21, pi. 1. fig. 33, Pt. 
Jackson. 
Crenella {IModiolaria) adolphi, Bunker, 1. c., St. Vincent, Australia ; C. {M.) 
mnltistriata, Smith, P. Z. S. 1871, p. 729, pi. 76. fig. 4, Wydah : spp. nn. 
Mvdiolaria divaricata (Phil.), Lischke, J. M.-Oonch. ii. p. 148, Nagasaki. 
Lithodomus aristatus (Solander) = ca?a7?^cr (Lam.) = (Morch), 
widely distributed, and nasutus (Phil.), from Nagasaki : id. ibid. ii. pp. 149- 
162. 
AviCULIDiE. 
Avicula radiata (Pease), Martens & Langkavel, 1. c. p. 63, pi. 4. fig. 5, 
Kingsmill I. 
Avicula margaritifera, the pearl-oyster of the Red Sea: cf. Klunzinger, 
Z. Ges. Erdk. vi. pp. 70 & 71. 
Electrina, new subgenus of Avicula. Shell more inequivalve, hinge-line 
short, posterior wing very short and indistinct. Type, A. smaragdina (Reeve). 
Stoliczka, Pal. Ind. iii. p. 391. 
Pinyia trigonalis (Pease), Martens & Langkavel, 1. c. p. 64, pi. 4. fig. 7, 
Kingsmill I. 
Perna vulsella (Lam.) = chemnitziana (Orb.) —jiexuosa (Sow., Morch), Japan, 
E. & W. Indies, and N.W. America : Lischke, J. M.-Conch. ii. pp. 163-166. 
OSTREACEA. 
Arcid^. 
Area kraussi (Phil.) and domingensis squamosa (hfxm.f^gradata 
(Brod )=divaricata (Sow.), Nagasaki : Lischke, 1. c. pp. 141-144. 
Area umbonata (L.) var., martini (R^cl.), Brazil, crossii (Bunker), Ma- 
zatlan, BXidi fuscomarginata (^<7.), Madagascar, figured by Bunker, Nov. Conch, 
pp. 131-136, pi. 44. figs. 6-7, and pi. 46. figs. 1-4, 8-11, & 12-14. 
Barbatia barbata var., A. adolphi and peter si (Bunker), figured, id. 
ibid, pp. 132-135, pi. 44. figs. 8-12, and pi. 46. figs. 6-7. 
