[163] Leuconia Gossei (Bowerbank MS.). Dr. Bowerbank, to whom I have communicated this species, thinks that it may have been confounded by former observers with the preceding. “The broad specific difference between them is that L. nivea has very large triradiate spicula at its surface, and L. Gossei has not, but has in lieu of them very large acerate ones at right angles to the surface.” (Bowerb. in litt.)
[164] Hymeniacidon caruncula.
[165] Hymeniacidon albescens.
[166] Pachymatisma Johnstoni.
[167] Microciona carnosa.
[168] I have been minute in the descriptions of these species, because the student of marine zoology has so little to aid him in the identification of our Sponges. This South Devon coast is peculiarly rich in these productions; and several of these, though common here, are considered, as Dr. Bowerbank tells me, quite rare. The figures, which I have drawn from the life with great care, will, I trust, leave no difficulty in the identification.
Plate [XXXVI.] is devoted to the above species of Sponges. Beginning from the upper right corner, we have Halichondria panicea, greenish yellow, with perforated hillocks: it occurs also in other parts of the picture. The scarlet one next below is Grantia coriacea. The black one to the right is Halina Bucklandi. The plump buff one under the scarlet is Halichondria incrustans. Below this is the contorted Leuconia nivea. Then follows, below, and a little to the left, Hymeniacidon caruncula. Below this are two specimens of Leuconia Gossei, and on the left, yellow, with a slender serpent-like projection, Hymeniacidon albescens. Behind this is the grey globular Pachymatisma Johnstoni, and below, to the left, the pale red Microciona carnosa.
Transcriber's Note
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