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



The painting of this species, although very variable, is constant in the specimens 

 from the above localities in two particulars, namely, in being of a dark brown tint upon 

 the lunule and area, and for the most part uniformly pale upon the flattened umbones. 

 In the young state the shell is remarkably compressed, a specimen 16 mm. in length 

 having a diameter of only 2^. This species ranges from the Red Sea through the Indian 

 Ocean as far as the Moluccas. 



Cii'ce sulcata, Gray. 



Circe sulcata. Gray, Analyst, vol. viii. p. 307. 



Circe sulcata, Romer, Monog. Venus, vol. i. p. 210, pi. Ivii. figs. '2-'2f/. 



Circe sulcata, Reeve, Concli. Icon., fig. 16, a~c. 



Circe artemis, Deshayes, Cat. Conchif. Brit. Mus., p. 86. 



Circe artemis. Reeve, Conch. Icon., fig. 1-5. 



Cii-ce metcalfei, Deshayes, Proc. Zool. Soc. Lend., 1853, p. 28. 



Cytherea erijthraea, Jonas, Philippi's Abbild., vol. iii. p. 71, pi. ix. fig. 2. 



Circe pacta, Romer, Mai. Blatt., 1860, vol. vii. p. 155. 



Cytherea pleheia, Hanley, Rec. Biv. Shells, p. 356, pi. xv. fig. 37. 



Habitat. — Station 212, south of the Philippines, in 10 to 20 fathoms, on a sandy 

 bottom ; also off Levuka, Fiji Islands, in 12 fathoms. 



Circe metcalfei, Deshayes, is identical with Circe artemis of the same author, and 

 not a variety of Circe undatina as suggested by Romer. It is rather more coarsely 

 concentrically ridged than the typical form of this species, bluish-white, varied with 

 very little of the brown painting which usually adorns this species. The specimens from 

 the first locality are half-grown examples of the variety pleheia. 



Circe atistralis, Sowerby. 



Circe mcstralis, Sowerby, Thes. Conch., vol. ii. p. 651, pi. cxx.xvii. tigs. 16, 17. 



Circe australis, Deshayes, Cat. Brit. ]\Ius., p. 87. 



Circe australis, Reeve, Conch. Icon., fig. 19. 



Ventis (Cytherea {Crista)) australis, Riimer, Monog. Venus, vol. i. p. 186. 



Habitat. — Station 188, south of New Guinea, at a depth of 28 fathoms ; green mud. 



This species is rather more compressed than Circe dispar, more finely concentric- 

 ally ridged, and has very much finer diverging sculpture at the sides. There are 

 specimens in the British Museum from Friday Island, Torres Strait, and North-east 

 Australia. 



