266 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
absence of figures of B. microptera leaves me in doubt. The animal is about 
fifty mm. in length, and in the broad diameter nearly half as wide. In 
general outline it resembles Bolina vitrea rather than Bolina septentrionalis 
Mertens. The lobes are, however, at least one third shorter than in Bolina 
vitrea, and the digestive cavity is proportionately longer, one third longer than 
the lobes. The auricles are similar in shape to those of Bolina vitrea. The 
apical sense organ is situated at the bottom of a deep cleft, and is provided with 
a series of radiating muscle fibres. , There are from fifteen to eighteen vibratile 
combs in each of the short, and thirty to thirty-five in each of the long ciliary 
bands. Unfortunately in our single specimen the lobes were so damaged that 
the course of the chymiferous tubes could not be traced with accuracy. 
Enough, however, remained to show that they were no more complicated than 
in Bolina vitrea. This is the only point in which it disagrees with A. Agas- 
siz’s description of Bolina microptera. 
Bolina, sp.? 
On January 19, near Guradu Island, we took a single immature Ctenophore, 
which is probably a young Bolina. It is in the Pleurobrachia stage, figured 
by Chun (Mon. Ctenophoren), but the lateral lobes have already begun to ap- 
pear, and the tentacles are short. The rows of vibratile combs extend nearly 
to the bases of the lobes. The mouth is a simple slit. 
Ocyroe pteroessa, sp. nov. 
Plate 8, Fig. 29. 
The polar diameter of the animal is about twenty-five mm. The body 
is so much flattened that the narrow diameter is only one half the broad. 
The lateral lobes form large wing-like structures, one third longer than the 
polar diameter. The movements of the animal are effected by their vigorous 
flappings. ~The ciliated bands are short, containing but few combs. The auri- 
cles are short, being only one half as long as the polar diameter, and are always 
pointed upward. Their edges are lined with a series of stout cilia, set at con- 
siderable intervals. The digestive cavity is large, variable in form, but is not 
normally lobed. The windings of the chymiferous tubes are simple, much 
more so than in Ocyroe crystallina. The “spots” so characteristic of the lobes 
of Ocyroe maculata are wanting, but most of the substance of the lobes is 
occupied by stout muscle fibres which radiate to the periphery. 
Ocyroe pteroessa is most closely allied to Ocyroe crystallina Rang, of which 
Fewkes and Mayer both give good figures (Bull. Mus. Comp. Zool., vol. 9, 
plate 1, and Bull. Mus. Comp. Zodl., vol. 38, plate 31), but differs from it in 
several important particulars. The lobes are proportionately larger, the body 
narrower, the auricles very much shorter, about one half as long. The out- 
line of the stomach is simple instead of lobed, and it is much shorter. The 
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