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GASTEROPODES. 
5. Eoris viripis.—Plate XLIV. Figs. 11, 12. 
Length six lines; breadth under two. Tentacula and cornicula 
nearly of equal length, rather cylindrical and obtuse. A black speck at 
the base of each corniculum. Back bare ; bordered by ten pair of bran- 
chial clusters of elongated papille, three, four, or five papillze beimg in 
each cluster. The central papille of each cluster are the longest, the 
exterior the shortest. They are always of a dark green colour ; the body 
green, of various intensity. 
Piate XLIV. 
Fic. 11. Holis viridis, back, enlarged. 
12. Belly. 
6. Eons SANGUIFER.—Plate XLV. Figs. 7, 8. 
Length eight lines. Shoulder rounded ; lower extremity acute. 
Head rounded in front, with two tentacula behind ; while, at some dis- 
tance, are two smooth, long, and slender cornicula. These are so closely 
approximated at the base, that they seem to fork from some lower or- 
ganization. A black speck or eye behind each. Back bare, bordered by 
two pair of branchial enlarging papilla. The branchie do not evidently 
form more than two clusters on each side in young examples. The whole 
papillee of a large specimen amounted to forty-eight, being twenty-four of 
aside. On one, half the size, the same number occurred, the four lowest 
overtopping the extremity. No subdivision of these two clusters were 
obvious, therefore the sides appeared to be clothed by only one. They 
may, however, be rated at four in adults. Colour universally milk-white 
or watery blue. The cornicula have a reddish tinge ; the branchize 
brighter than tile-red, their extremities white. The red is duller in 
some specimens ; and it has faded with time in others. The young are 
more beautiful than adults. : 
This animal feeds on the Zubularia indivisa and on the Tubularia 
polyceps, infesting those Zoophytes in nunierous colonies. In the history 
