MOLLUSCOIDA. 51 



Family Vesiculariadse. 

 Genus Vesiculakia, 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 Pedicellimdae. 

 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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