GASTEROPODA. 307 
PLACOBRANCHUS IANTHOBAPTUS (Gould). 
Corpus oblongum, triquetrum, posticé abruptum, ex flavido olivaceum, 
ocells majoribus cerulets albo-pupillatis et ocellis minoribus albis 
aurantiaco-pupillatis ornatum, cauda et labits ianthino tinctis: caput 
latum ; tentaculis ochracets violaceo annulatis: pes pallio haud disjunc- 
tus, smaragdinus, ocellatus ; pleis branchialibus smaragdinis. 
Body elongated, in the form of a three-sided prism, terminating ab- 
ruptly, as if torn off behind. Head broad, heart-shaped in front, lip 
edged with violet; tentacles involute, as if formed by an extension of 
the angles of the hood, ochreous tipped with white, annulate with 
violet near the lip, retractile at tip. Colour of the back yellowish, 
shaded with olive, ornamented with two sets of ocelli, the larger in 
two series of eight on each side, with a blue pupil and white iris, and 
numerous smaller ones with orange pupil and white iris; foot not dis- 
tinct from the body except in colour, emerald green, with the blue 
and orange ocelli smaller, and more nearly equal in size than those of 
the back. Margins of the body dilated and folded upon the back; 
branchial folds grass-green, radiating from the cardiac swelling behind 
the head. 
Length two and a half inches; breadth five-eighths of an inch. 
Found upon a coral reef at Honolulu, Sandwich Islands. 
Though having a general similarity to P. ocellatus, its divergence 
is so great that it cannot be considered as a variety of that species. 
Its bright colours indicate its exposure to light, but it is perfectly 
helpless when taken out of the water. 
Figures 407, 407 a, lateral and ventral views of the animal; 407 8, 
the mantle thrown open, showing the branchial folds; 407, the side, 
in outline. 
DIPHYLLIDIA RUBIDA (Gould). 
Corpus lanceolatum, postice acuminatum, erubescens, dorso concinné 
plicato ; palium angusté reflexum ; caput cucullatum. 
