BY C. HEDLKY. 293 



Cecum bimarginatum Carpenter. 

 (Plate xviii., figs. 64, 65, 66.) 

 Caecum bimarginatum Carpenter, Proc. Zool. Soc., 1858, pp.431, 

 442. 



This imfigured species was recorded from "Australia," because 

 it was found on the shell of Petaloconchus nerinaeoides. In the 

 British Museum, there is preserved one specimen, probably type, 

 but not so marked, on a slide in a corked tube, "27, Caecum bimar- 

 ginatum, Cpr., Singapore, Revd. P.P. Carpenter" ; again, one speci- 

 men on a glass slide in a corked tube, labelled "27 Caecum (?) bi- 

 marginatum, jun., Australia, Rev. P. P. Carpenter." (My fig. 64.) 



To assist in the recognition of these, figures are now presented. 



Cecum subquadratum Carpenter. 

 (Plate xviii., fig.67.) 



C cecum subquadratum Carpenter, Proc. Zool. Soc, 1858(1859), 

 p. 433. 



An illustration is here given of a specimen in the British 

 Museum, perhaps a type, but not so marked, mounted alone on a 

 glass slide in a corked tube, and labelled, "33 Caecum subquadra- 

 tum, Cpr., Australia, W. Bean." But the published reference is 

 "Port Elizabeth (Bean)." 



Cecum regulare Carpenter. 

 (Plate xviii., figs. 68, 69, 70.) 



Ccecum regulare Carpenter, Proc. Zool. Soc, 1858, p. 428. 



This species was reported by its author to have been found on 

 the Australian shell Petaloconchus nerinaeoides. In the British 

 Museum, I found the following series, one shell to each tablet, 

 mounted on a labelled glass slide in a corked tube, "22 Caecum re- 

 gulare, Carp., Singapore, Rev. P. P. Carpenter," "Caecum (?) re- 

 gulare Cpr., Australia, Rev. P. P. Carpenter," " 22 Caecum regu- 

 lare, Cpr., W. Indies, S. P. Woodward." There is also one speci- 

 men, Caecum regulare Carp, from the Challenger Station 122, in 

 350 fathoms off Pernambuco. 



