OPISTHOBUANCHIATE MOLLUSC A. 343 



hooked, with from 8 to 10 fine lateral denticulations on the outer side. The innermost 

 lateral tooth is denticulated on both sides. 



The labial armature is formed of bent rods with pointed tips slightly hooked. 



Professor Herdman's notes contain a sketch of the animal in a living state which 

 shows very well the characteristic shape, and very closely corresponds witli the figure 

 of C cincta given by Bergh (9, plate lxxviii., fig. 9). Professor Herdman describes 

 the colours in the living animal as follows : " Pink with green edgings ; edge of foot 

 and mantle white, then a marked green line, then inside that a yellow band, then a 

 pink and white dotting covers the rest. Branchiae in two spirally arranged tufts ; 

 four large processes in front." 



Ceratosoma cornigerum, Grey (?). 



It is difficult to name with any certainty preserved specimens of Ceratosoma unless 

 the colour of the living animal has been noted, as the radula and jaws of all the 

 described species are almost identical and the external form is liable to a considerable 

 amount of variation. There are in the collection three specimens of Ceratosoma, all 

 very small, under 2 centims., which I have doubtfully referred to the above species. 

 They vary considerably in the length of the dorsal horn, but agree in having the line 

 of separation between the back and sides marked by a not very prominent ridge, 

 which is not produced into lateral lobes. They are of a uniform cream colour, one 

 specimen, from south-east of East Cheval, being distantly spotted with opaque white 

 dots. The other two specimens were taken at Talaivillu Paar and jr mile south-east 

 of Dutch Modragam Paar, respectively. 



[Ceratosoma ornatum, Bgh.] 



In Professor Herdman's notes there is a description with accompanying sketch of 

 a species of Ceratosoma, but the specimen to which it refers has apparently not been 

 preserved, or has disappeared from the collection. There is no doubt, however, that 

 the species is C ornatum, which has been described by Bergh from a specimen taken 

 in Amboyna (9, p. 946). 



Professor Herdman's description, which is fuller than that given by Bergh, is as 

 follows : " Spotted all over with yellow on a pale mauve ground, deeper on dorsum, 

 getting to white on foot, with deep mauve or purple edgings to the front and lobes. 

 Horn with mauve edgings on pale ground ; tail with yellow spots on mauve. Head 

 with yellow spots on white. Front of foot with mauve spots on white. Rhinophores 

 brown at base, violet at tip, laminated. Anus violet edged. Gills white at base, 

 yellow in middle, brown at tip. Off Galle, 34 fathoms, February 18th, 1902." 



The capture of a small violet-spotted specimen on March 8, 1902, towards the 

 north of the Gulf of Manaar, is also noted, but the specimen is absent. This may be 

 an undescribed species, as none of the described species are violet spotted, except as 

 subsidiary to other coloration. 



