294 GASTEROPODES. 
Pirate XLII. 
Fic. 1. Doris verrucosa: back. 
2. Belly. 
3. Branchial teeth. 
Prats XLITI. 
Fic. 1. Spawn of the Doris verrucosa, or Doris argo, in a spiral form. 
2. Another deposit, in great quantity. 
. A deposit still more ample. 
. Spawn refining, in its progress to maturity. 
. The ova, or capsules, in a portion of spawn, enlarged. 
. Capsules containing more than one Nautiline. 
“IQ Or PS CS 
. Portions of Fig. 2, shewing the Nautilines within capsules, enlarged 
near maturity. 
2. Doris ARGo.—Plate XLII. Figs. 4, 5, 6, 7. 
Formerly, when a more limited view was taken of the lower animals, 
authors were disposed to assume this species as the type of the genus 
Doris; and they may have been induced to do so, either from the facility 
of obtaining it, or from its dimensions, that of the Scotish seas being of 
size inferior only to the Doris or T’ritonia Hombergit.—Plate XXXVITI. 
figs. 1, 2. 
Length towards five inches ; breadth towards two inches. Figure of 
the animal in quiescence oval. A verrucose or warty cloak forms the up- 
per surface, and covers the whole body, which is quite smooth. The head 
and sole are distinctly separated ; the former small, not exceeding nine 
lines in breadth, fleshy, with the mouth in the centre of the face ; and 
each corner a very short obtuse cone. Two hornsrise from the anterior 
of the upper surface, conical and obliquely indented like a cross cut file, 
issuing from low sockets, with a tuberculated margin. The branchial 
apparatus is situate on the back near the posterior extremity. It gene- 
rally consists of seven or eight foliaceous organs, finely fringed, resem- 
bling feathers, originating from a short pillar, with the vent in the centre. 
A prominent smooth rib, with five or six subordinate ribs, also smooth, 
