610 EDGAR A. SMITH. 
135. Sistrum biconicum, Blainville (Purpwra biconica, Kiener, 238. Sistrum biconicum, 
Tryon, 41,72. Ricinula chrysostoma, partim, Reeve, 37,/7//.) XIII. 
136. Sistrum cavernosum, Reeve (Ricinula cavernosa, Reeve, 37,/7//.) IX, XV. 
137. Sistrum iostoma, A. Adams (Pl. XXXV. fig. 14). (Murex ‘ostomus, A. Adams, 
cy) WHE 
This species is allied to S. spinoswm, but appears to be separable. 
138. Sistrum squamosum, Pease, 31,a. XI. 
The Maldive specimen is quite typical. 
139. Sistrum concatenatum, Lamarck (Ricinula concatenata, Reeve, 37, [II., var.= Purpura 
fragum, Blainville, 23). IX. 
A very variable species in size, form, and colour. Only a single small specimen was obtained 
at the above station and it most resembles the variety fragwm as the aperture and labrum are 
white and not orange red as in the type. 
140. Sistrum decussatum, Reeve, var. (Murex decussatus, Reeve, 37,///.) XIV. 
A single very small specimen differing from the type in having a shorter anterior canal, and in 
the nodules at the upper angle of the whorls being uncoloured and acute. Although adult, only 
13mm. in length. 
Family CORALLIOPHILIDAE. 
141. Coralliophila monodonta, Quoy and Gaimard (Purpura monodonta, 23). II, V, IX, 
eXCe ee XC 
142. Coralliophila neritoidea, Gmelin (Purpura violacea, Kiener, 37, ///.) VIII, IX. 
143. Coralliophila suturalis, A. Adams, 1,6 (C. galea (partim), 41,//. Khizocheilus exu- 
ratus, Pease, 31,6). IX, XV. 
144. Coralliophila squamosissima, Smith, 41,//. IX. 
145. Leptoconchus ellipticus, Sowerby (Magilus ellipticus, Sowerby, 40,a, XVIII.) XY. 
The transverse ribbing usually extends over the greater part of the body-whorl, although, in 
the description, Mr Sowerby observes that the shell is “spirally slightly ribbed below the middle,” 
as if this were a specific feature. A fine example in the British Museum from the Mauritius is 
27mm. long, and 22 in diameter. 
146. Leptoconchus cumingii, Deshayes, 12, a, 40,a, XV/JJ. XV. 
The shell figured by Sowerby (/.c. fig. 10) as Magilus globulosus, I regard as a form of the 
present species. 
Family LOTORIIDAE. 
147. Lotorium chlorostoma, Lamarck (Zvriton chlorostoma, Reeve, 37, //.) IX, XV. 
148. Lotorium gemmatum, Reeve (Zriton gemimatum, Reeve, 37, //.) IX. 
149. Lotorium pyrum, Lamarck (7riton pyrum, Reeve, 37, //.) IX. 
150. Lotorium tuberosum, Lamarck (Zriton tuberosus, Reeve, 37,//.) I. 
151. Colubraria ceylonensis, Sowerby (Z’riton ceylonensis, Reeve, 37,//.) V, XIV. 
