50 MARINE FAUNA OF ST. ANDREWS. 



Genus Heteroporella, Busk. 

 Heteroporella hispida, Flem. ; Ilincks, loc. cit. p. 469. 

 On stones and shells from deep water ; rather rare. 



Family Crisiadae. 



Genus Crisia, Lamx. 



Crista eburnea, L. ; Johnst. Brit. Zooph. p. 283, 

 pi. 50. f. 3 & 4. 



On the under surface of stones between tide-marks, often 

 with many parasitic hydroids and Conferva, and on zoophytes 

 and seaweeds from deep water. Abundant. 



Suborder CTEN0ST0MATA, 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 hirsutum, 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. 



Arachnidia hippothooides, Hincks, Ann. & Mag. Nat. Hist. 

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



On Ascidia sordida from deep water; in abundance. 



