MOLLUSCOIDA. 
51 
Family Vesiculariadae. 
Genus Vesicularia, J. V. Thompson. 
Vesicularia spinosa, L.; Johnst. Brit. Zooph. p. 370, 
pi. 72. f. 1-4. 
Found near low-water mark by the late Prof. John 
Reid. 
Genus Bowerbankia, Farre. 
Bowerbankia imbricata , Adams ; Johnst. Brit. Zooph. 
p. 377, pi. 72. f. 5 & 6. 
Abounds on the under surface of stones, on the stems and 
branches of littoral zoophytes, and on the tests of Cynthia 
grossularia under shelving rocks. Also found by Prof. J. 
Reid. 
Order Phylactol^emata. 
Suborder PEDICELLINEA. 
Family Pedicellinidse. 
Genus Pedicellina, Sars. 
Pedicellina echinata, Sars; Johnst. Brit. Zooph. p. 382, 
pi. 70. f. 5. 
On the branches of Ceramium rubrum and other littoral 
algae and zoophytes; abundant. 
Class II. TUNICATA. 
Comparatively few Ascidians have been procured; indeed 
the department is in such a condition at present (as to specific 
identification) that a much greater amount of time would have 
been required for their elucidation than was available. The 
late Mr. Joshua Alder most kindly looked over the collection, 
and named those requiring identification in his usual con¬ 
scientious manner; and it is to be hoped that the work on 
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