Molluscoida of St. Andrews. 311 



with many parasitic hydroids and Confervae, and on zoophytes 

 and seaweeds from deep water. Abundant. 



Suborder CTENOSTOMATA, Busk. 



Family Alcyonidiadae. 



Genus Alcyonidium, Lamx. 



Alcyonidium gelatinosum^ Pallas ; Johnst. Brit. Zooph. 

 p. 358, pi. 68. f. 1-3. 



On stones and bivalve shells from deep water ; common. 



Alcyonidium hirsutuvij Flem. ; Johnst. Brit. Zooph. p. 360, 

 pi. 69. f. 1 & 2. 



Abundant on seaweeds near and beyond low-water mark. 



Alcyonidium parasiticum^ Flem. ; Johnst. Brit. Zooph. 

 p. 362, pi. 68. f. 4 & 5. 



Frequent on the stems of zoophytes from deep water ; very 

 characteristic. 



Genus Arachnidia, Hincks. 



AracTinidia hippothooideSj Hincks ; Ann. & Mag. Nat. Hist. 

 3rd ser. ix. p. 471, pi. 16. f. 2. 



On Ascidia sordida from deep water ; in abundance. 



Family Vesiculariadse. 



Genus Vesicularia, J. V. Thompson. 



Vesicularia spinosa, L. ; Johnst. Brit. Zooph. p. 370, 

 pi. 72. f. 1-4. 



Found near low-water mark bv the late Prof. John 

 Reid. 



Genus Bowerbankia, Farre. 



Bowerbanhia imhricata, 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. 

 lleid. 



22* 



