52 THE VOYAGE OF H.M.S. CHALLENGEE. 



Ohsenxition. — The more elongated shape of this species distinguishes it horn. Megerlia 

 jeffreysi. The shell was submitted to Mr Dall, who states that the loop resembles that 

 of a Megerlia, like jeffreysi. I have named it after the late able and much regretted 

 naturalist of the Challenger Expedition, Dr Rudolf von Willemoes-Suhm, to whom 

 science is indebted for many valuable contributions. 



Megerlia sanguinea, Chemn., sp. (PI. III. fig. 14, a). 



Anomia sanguinea, Cliem., Conch. Cab., vol. viii. p. 96, pi. Ixxviii. fig. 706, 1785. Dillwyn, Cat. 



Eec. Shells, p. 293, 1817. (Not of Solander.) 

 Anomia sanguinolenta, Gmel., n. sp., p. 3347. 

 Anomia cruenta, Soc. MS. (Not of Dillwyii.) 

 Terebratula cruenta, Donovan, Nat. Eep., pi. Ivi. fig. 1. 

 Tereh-atula erythroJeuca, Quoy and Gaimard, Voyage de I'Astrolabe, vol. iii. p. 557, pi. Ixxxv. figs. 



9, 10. 

 Terebratula sanguinea, Sow., Thes. Conch., vol. i. p. 357, pi. Ixxi. figs. 71-73. (Not. of Lam., Leach, 



or Donovan.) 

 Terebratula pulchella, Sow., Thes. Conch., vol. i. p. 360, pi. Ixxi. figs. 105-107. Dav., Ann. and Mag. 



Nat. Hist., p. 368, 1852. Gray, Brit. Mus. Cat., p. 90. Eeeve, Conch. Icon., pi. vii. fig. 25. 

 Megerlia pulchella, Dav., Ann. and Mag. Nat. Hist., p. 369, 1852. 

 Megerlia (Yonenia) pulchella, Gray, Brit. Mus. Cat., p. 104. A. Adams, Ann. and Mag. of Nat, Hist., 



vol. iL p. 99, 1863. 

 Megerlia sanguinea, Dav., Proc. Zool, Soc, p. 308, pi. xxxi. figs. 1, 2, 1871. Dall, Proc. Phil. 



Acad. Nat. Sciences, p. 187, 1873. 



Shell small, ovate or circular, smooth, thin, "whitish or yellowish, radiately interruptedly 

 freckled with bright blood colour. Dorsal valve moderately convex, with a more or less 

 defined mesial dejDression, commencing at about half the length of the valve and extend- 

 ing to the front. Ventral valve rather deeper than the dorsal one, uniformly convex, 

 sometimes either slightly keeled or flattened along the middle. Beak moderately incurved 

 and truncated by a circular foramen, very slightly separated from the hinge-line by a 

 small deltidum ; beak-ridges well defined, leaving a flattened space or area between them 

 and the hinge-line. Shell perforated by canals. In the interior of dorsal valve the loop 

 does not extend to much further than to about two-thirds of the length of the valve, and 

 is three times attached ; first to the hinge-plate, then before attaining half its length to a 

 longitudinal septum, and a third time by vertical laminae, which connect the lateral 

 reflected extremities of the loop with the median septum (fig. 14, a). Length 11, width 

 10, depth 9 mm. 



Habitat. — Only one specimen was dredged by the Challenger Expedition, between 

 Stations 212 and 213, on February 1, 1875, at the Eeefs of Zamboanga, in 10 fathoms 

 depth. One example had likewise been dredged by the " Astrolabe " Expedition at Tonga- 

 tabu. I have very fine and large specimens from ofi" the Island of Zebu in the Philip- 

 jDines, and Honolulu in the Sandwich Islands, attached to coral and stones. The Rev. J. E. 



