140 A. E. SHIPLEY. 
numerous. Intestine in about 10—12 coils, no diverticula on rectum. Tentacles few and 
short. Two conspicuous eyes. 
Locality. The single specimen was procured by breaking up a large coral mass, dredged 
from 25 fathoms at Miladumadulu in the Maldive Islands. It is worth noting that the 
undoubted head-quarters of the genus Aspidostphon is in the Indian Ocean. 
EXPLANATION OF PLATE VII. 
6 =brain. nm =neryes. 
ch. p= chitinous process on introvert. oe = oesophagus. 
d. v = dorsal blood vessel. p  =pad which secretes stony cap. 
e = eye. ip = rectum. 
i = intestine. 7. m = retractor muscles. 
int = introvert. sp.m= spindle muscle. 
1  =base of lophophore. v.m = ventral nerve cord. 
1.1% =lower lip. 
Fic. 1. Side view of Lithacrosiphon maldivense Shipley, x 2, showing the appearance and the colour 
of the specimen preserved in spirit. 
Fic. 2. Dorsal view of the head x 4, showing the white calcareous cap, the sheath which surrounds 
its base, the tubercles on the skin, and the anus. 
Fic. 3. Ventral view of the head x 4, showing the orifice of the introvert and the other 
structures mentioned under Fig. 2. 
Fic. 4. Side view of the head x about 4:5, showing the profile of the calcareous cap. 
Fic. 5. The body of the animal laid open by a dorsal incision to show the internal organs, x 2. 
Fic. 6. One of the chitinous projections found amongst the hooks of the introvert, highly magnified. 
Fic. 7. Two of the hooks of the introvert, highly magnified. 
Fic. 8. Transverse section through the semi-circular mouth, showing the base of the lophophore 
and the lower lip, each with nerves coloured yellow and blood sinuses white, highly 
magnified. 
Fic. 9. Transverse section through the posterior half of the brain and through the ventral half 
of the circumoesophageal nerve-ring, both coloured yellow. 
Fic. 10. Transverse section through the retracted introvert and the ventral nerve cord. The 
introvert had contracted into a three-ridged tube. The hooks and nervous system are 
coloured yellow. One of the chitinous projections is shown, 
Fic. 11. Transverse section through the anterior half of the brain showing the eyes; the two 
halves of the cireumoesophageal cord are shown on each side of the oesophagus. 
