AGASSIZ AND MAYER: ACALEPHS FROM THE FIJI ISLANDS. 161 
Pennaria vitrea, nov. sp. 
Plate 1, Figs. 1, 2. 
Generic Characters. Pennaria, Goldfuss, 1820. Four rudimentary marginal 
tentacles that are rednced to mere basal bulbs, No ocelli. Four radial tubes. 
Gonads within the proboscis. No peduncle nor oral appendages to the 
proboscis. 
Specific Characters. The bell is 3 mm. in height; and the walls are thick 
and rigid. There are 4 rudimentary tentacle bulbs. The velum is not promi- 
nent. The 4 radial canals are straight and narrow. The proboscis in the 
female specimen (Fig. 1) was retracted within the cavity of the bell, but in the 
male (Fig. 2) it was flask-shaped, and projected for a little distance beyond 
the velar opening of the bell. These conditions, however, may be merely 
different states of contraction and not constant differences ; but, as we observed 
only two individuals, one a male and the other a female, we cannot be certain 
upon this point. The ova are large and pyriform, and are grouped in 4 radi- 
ally arranged clusters within the proboscis. The mouth opening of the pro- 
boscis is very simple, and there are no fimbriations or appendages. 
Prominent cireular muscles were observed in the ectoderm of the cavity of 
the bell in the female, but these were not seen in the case of the male. It is 
possible, however, that they become apparent only during certain states of con- 
traction. In the female the ove and tentacular bulbs were flesh-colored, and 
the entoderm of the mouth of the proboscis was green. In the male the ten- 
tacular bulbs were green, the entoderm of the proboscis pink, and the lips 
green. 
Found off Kimbombo Island, November 25, and off Mbatiki Island, Decem- 
ber 5, 1897. 
Cyteeis vulgaris, nov. sp. 
Plate 2, Figs. 3, 4, 5. 
Generic Characters. Cytæis, Eschscholtz, 1829. Margellid® with simple 
unbranched oral tentacles upon the proboscis, and with 4 radially situated 
marginal tentacles, 
Specific Characters. ‘The bell is thin and slightly pyriform in shape, and is 
3 mm. in height, The 4 marginal tentacles are somewhat stiff,.and are usu- 
ally seen curled upward in a semicircular curve. The tentacle bulbs are large 
and prominent. The velum is well developed. There are 4 thin straight 
radial tubes. The proboscis (Figs. 3, 4) is pyriform, and possesses a slightly 
developed peduncle. Sixteen simple oral tentacles surround the mouth. The 
entodermal cells of these tentacle are disk-shaped, and their free ends are armed 
each with a battery of nematocysts (Fig. 5). The mouth opening is simple, 
and, excepting for the oral tentacles, there are no other appendages. The color 
of the entoderm of the tentacle bulbs is dark salmon-red, as is also the entoderm 
