314 Mr. A. Hancock on a Burrowing Barnacle. 
surface: the four arms or feet next the mouth provided each 
with a prehensile cushion: palpi furnished with pmcers ; upper 
lip rostrated. 
A. lampas. Animal with the margins of the lips thickened, 
each being furnished posteriorly with a curved point or process ; 
posterior portion considerably depressed, rounded, and provided 
with a horny plate on the upper surface: chamber in the shell 
of mollusks, partially ined with calcareous matter secreted by 
the animal; opening narrow, enlarged and rounded in front, 
tapermg and curved behind. Length ;4ths of an inch, breadth 
7aths of an inch. 
EXPLANATION OF PLATES VIII. ann IX. 
Prate VIII. 
Fig. 1. A portion of Fusus antiguus exhibiting numerous specimens of 
Alcippe lampas in the columella and sides of whorls: a, stain 
caused by the animal; 3, slit by which it communicates with the 
water. 
Fig. 2. Much-enlarged view of the external appearance of the chamber of 
Alcippe lampas: a, stain produced by the animal seen through the 
shell, exhibiting pale radiating lines and punctures; 3, slit in the 
matrix or shell by which the animal communicates with the water ; 
c, calcareous layer partially lining the chamber, and projecting 
beyond the margins of the slit; d, calcareous granules filling up 
posterior extremity of ditto. 
Fig. 3. Upper view of Alcippe lampas removed from its chamber: a, ante- 
rior portion containing the arms and true body; 6, broad disc-like 
portion corresponding to the pedicle of the pedunculate Barnacles ; 
¢, valvular lips; c', the slit or opening; d, posterior terminal points 
of lips; e, horny plate; f, arms partially exserted ; g, the point at 
which the animal is attached to the chamber. 
Figs. 4,5. Under and side views of the same: letters as in fig. 3. 
Fig. 6. Anterior portion laid open to show the true body and arms: a, one 
of the valvular lips; 6, the other cut across and laid back ; ¢, fleshy 
pedicle supporting the arms d ; e, mouth; /, upper lip; g, rostrated 
termination of same; h, arms or palpi by the sides of the mouth 
furnished with pincers ; 2, branchie. 
Fig. 7. Portion of the true body as seen in the compressor: a, upper lip ; 
b, rostrated termination of same ; c, carinated margin of same; 
d d, arms or palps by sides of mouth; ¢, prehensile arms; e!, the 
mouth ; /, the outer or first pair of mandibles; g, second pair of 
ditto ; 4, third or innermost pair of ditto ; 7, the branchiz. 
Fig. 8. A few of the plates or sete of the branchie highly magnified, ex- 
hibiting a double channel at the broad extremity which is bifid. 
Fig. 9. Prehensile cushion of the arms. 
Puate IX. 
Fig. 1, The prehensile arms highly magnified : a, fleshy pedicle; 6 5, cushion- 
like swelling of same. 
Figs, 2,3, 4, Different views of the larva of Alcippe lampas: a, interrupted 
rose-coloured line surrounding the dorsal shield. 
Fig. 5. A mass of the eggs a little magnified. / 
Figs. 6, 7, 8, 9,10. Eggs highly magnified, exhibiting different stages of 
development. 
