2 COLLINGE : NOTES ON VERONICELLA BIKMANICA. 



My specimens average from 28 to 38 millim. in length, and 

 10 to 18 millim. in breadth. The ground colour is yellowish-brown, 

 minutely marked with a series of black dashes and spots, these being 

 absent in the median line of the dorsum, in which runs a pale 

 yellow line. Stoliczka mentions that " the median dorsal pale stripe 

 generally becomes distinct only in older specimens, and the lower 

 side of the mantle is uniform livid ; in very young specimens Uie 

 pale stripe is absent, and the mantle marked below with dark 

 dots." It is evident that these characters are hardly likely to be 

 characteristic. I have young examples in which the pale stripe is 

 present, and old ones in which the mantle is marked below with 

 numerous dark dots. 



Theobald {op. cit.) describes the foot as " Pede transversim rugoso, 

 totius corpores lofigitudinus, sed vix ad quartam partem latitudines 

 altengentcy Nevill states that the sole of the foot is " nearly white 

 with faint transverse white lines." Now in the specimens I have 

 the foot is very similar to the ground colour of the dorsal surface — 

 it is certainly not white or even pale yellow. The foot sole may be 

 divided into seven distinct parts. On either side is a plain lateral 

 plane, finely and irregularly marked, next a distinct line separating 

 the lateral plane from, what I shall term, the inner plane, which is 

 divided in a regular manner by a series of transverse lines or grooves 

 at intervals of about h. i^iiHini. The two inner planes stand out 

 more prominently than any other portion of the foot, so that the 

 median plane is somewhat concave, but possibly this is only due to 

 the effect of the alcohol. The median plane is also marked by a series 

 of fine transverse lines. 



In the largest specimen, measuring t^Z millim. in length and 

 18 millim. in breadth, the lateral planes are i millim. broad, the 

 inner planes \ millim., and the median plane i millim. 



The median plane is really the outer wall of the pedal gland, and 

 passes from just beneath the mouth to the posterior end of the body, 

 gradually becoming narrower and terminating about two millim. from 

 the extreme edge of the foot-sole. 



As to the name of this species, Stoliczka (loc. cit., p. 33) suggested 

 it was the V. hasselti, Von Mts., 1867, and that both were very 

 probably the Onchidiutn molli of Hasselt ( = K mollis^ Hasselt). 

 I am not acquainted with the anatomy of either of these two forms, 

 but seeing that V. birmanica has received more attention than any 

 of the three, and is better described, it had better remain irrespective 

 of what is done with the remaining two, which, as yet, are 

 inadequately described. 



