50 
MARINE FAUNA OF ST. ANDREWS. 
Genus Heteroporella, Busk. 
Heteroporella hispida , Flem.; Hincks, loc. cit. p. 469. 
On stones and shells from deep water; rather rare. 
Family Crisiadse. 
Genus Crisia, Lamx. 
Crisia 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 Confervas, 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. 
