GASTEROPODA. 317 
the whole surface sparsely and irregularly spotted in the same way, so 
as to present a delicately mottled aspect. A fourth variety was of a 
uniform dark rose-colour, and the margin clouded with dark red 
bands. Internally it was dark red or rosy along the middle, and dull 
yellow towards the sides. All the other varieties were of a pale 
greenish hue internally.” 
The sculpture of this very variably coloured species is sufficiently 
characteristic. Between the strie are usually found minute pores, 
probably produced by some parasite. 
Figure 419, profile of the shell; 419 a@, ventral view; 419d, details 
of sculpture, magnified. 
CuiTon sJucosus (Gould). 
Testa ovalis, carinata, tectiformis, nitida, coloribus pallid? et saturate 
herbets variegata; valvis planulatis, ad apices adunco-acuminatis ; 
areis lateralibus prominentibus, et lineolis confertis parallels viridibus 
longitudinaliter notatis ; areis centralibus sulcis acutis parallelis longi- 
tudinaliter aratis, sed ad verticem simplicibus et minutissime punc- 
tatis ; valvd antertori concentrice lineolata ; valva posteriort umbonata, 
prope marginem concentricé lineolata, preter aream terminalem trt- 
angularem luteolam ; margine granulato, fasciis ceruleis et viridibus 
- Ambato: intus palhde virescens. 
Chiton jugosus, GouLD; Proceed. Boston Soc. Nat. Hist., 11. 142. 
July 1846. Expedition Shells, 3. 
SHELL of moderate size, oval or very slightly narrowed in front, 
sharply ridged upon the back, and declining on each side in a roof- 
like manner. Colour mottled with various shades of grass-green 
and yellow, sometimes the yellow predominating. The summits of 
the valves are very entire, pointed and incurved; the lateral areas 
are prominent, sharply defined, polished and regularly striped with 
crowded, parallel, alternately light and dark lines, which at first sight 
have the aspect of fine, longitudinal furrows; the central areas are 
deeply furrowed at the sides with about twelve coarse, sharp, parallel, 
longitudinal furrows, which are gradually curtailed so as to leave the 
vertices smooth or rather minutely punctured in quincunx. Anterior 
80 
