20 



THE VOYAGE OF H.M.S. CHALLENGEK. 



10 to 63 



150 



300 to 400 



0) 



150 



(^) 



Shore to 10 

 fathoms. 



Section B. — Ismenia, King. 

 Lateral loops open, shell more or less swollen, ovate, smooth (DaU). 



*Megerlia sanguinea, Chemn., Conch. Tab., vol. viii. p. 96, 

 pi. Ixsviii. fig. 706 = A. sangidnolenta, Gml. = 

 Anomia cnienta, Sol. MS. = T. erythroleuca, Quoy 

 and Gaimard=T'. pulcliella, Sow. (?), T. sanguinea, 

 var. reemt, Adams. A fine weU-characterised species. 



*.MegerUa willemoesi, Dav., Proc. Eoy. Soc, vol. sxvii. 

 ]). 438, 1878. Three or four specimens alone hitherto 

 obtained. 



ifjMegerlia jeffregsl, DaU. Two distinct species have 

 been mixed up by Mr DaU under the name of 

 Jeffreys!, as he himself now admits to be the case. 

 Frenula and Ismenia (Ijeffreysi), DaU, as described 

 in the American Naturalist, vol! v. p. 55, 1871, and 

 in the Am. Joiu-n. of Conch., vol. vii. part ii. p. 62, 

 pi. ii. figs. 7-10, are, according to Dr Gwyn Jefi'reys 

 and Mr DaU, immature young specimens of Wald- 

 heimia cranium. Subsequently, Mr DaU gave the 

 name jeff'reysi to another shell (see Jeffreys, Proc. 

 Zool. Soc, 1878, p. 406, pi. xxiii. fig. 3), belonging 

 to Section B. of MegerUa, and quite distinct from the 

 shells to which he had originally applied the name. 

 If, therefore, the name jeff'reysi is to be retained, it 

 will have to be so for the last-named species. 



Reefs, Zamboanga ; Jajjan, 

 Indo-Pacific ; off' Island of 

 Zebu ; Korea ; off Tahiti ; 

 Honolulu, Sand^vich Is- 

 lands ; Pharo, New Cale- 

 donia ; Bird's Island, North 

 Australia. 



Twofold Bay, South Aus- 

 tralia. 



North Atlantic Ocean. 



Genus Kraussina, Dav. 



No loop. Interior of dorsal valve furnished with a forked process, rising nearly 

 centricaUy from the bottom. 



Kraussina rubra, Pallas, sp., Misc. Zool., pi. xv. figs. 

 2-11, 1866 = Anomia striata, Chemn. = Anomia 

 rotundata, Blainv. 

 * Kraussina pisum. Lam., Anim. sans Vert., vol. vi. p, 245, 

 1819 = r. natalensis, Krauss. 



{1)Kraussina cognata, Chemn., sp., Couch. Cab., vol. vii. 



p. 78, pi. Ixv. Probably a malformation of a large 



specimen of K. pisiun. It can be seen in the 



British Museum. 

 *Kraussina lamarclciana, Dav., Proc. Zool. Soc, p. 80, 



pi. xiv. figs. 22, 23, 1852. 



Port Elizabeth, Natal, South 

 Africa, Cape of Good Hope. 



Near Cape of Good Hope ; 



Natal ; Agulhas Bank, 



South Africa. 

 South Africa. 



Port Jackson, near Sydney, 

 South AustraUa. Found 

 abundantly under stones 

 (T. Woods). 



