THE ZOOLOGICAL LABORATORY AT EOSCOFP. 201 



green coloiirnig matter of plants. Ascidians of many kind 

 abounded ; amongst these Molgula and Fhallusia wore es- 

 pecially fine, and GlavelUnas showed tlio reversing action of 

 the heart. Amongst the Mollusca fine Myas, Clams, Fectens, 

 and Gypr<Bas were found. Octopus and Sepia were not 

 uncommon. Expeditions were made by boat to isolated 

 rook stacks at very low tides. The fa,una licro was won- 

 derfully rich. Sea anemones, sponges of many kinds, 

 ascidians, and the hydroid polyp Lucernaria, wore foond 

 in extraordinary numbers; on the sea- woods were many 

 diatoms and live foraminifera. From tliese rocks came 

 also the splendid barnacle Pollicipes, which has thick, strong 

 valves, and lives exposed to the wildest dash of the waves. 

 Among the sponges was one specially fine one, Facliymatisma, 

 which has a sphincter muscle round each oscale. 



Many interesting forms of Folyzoa wore found ; such as 

 Loxosoma and PedicelUna, tho former parasitic on the tails 

 of the gephyrean worm Fhascolosoma. Internal parasites 

 were very numerous ; many Gregarines wore fcjund, one 

 possessed of much more active powers of locomotion than 

 has liitlierto been ascribed to these little creatures. A new 

 infusorian, a marine Urceolaria, was found. Tho Bicyemida 

 were abundant in tho Octopus and Sepia. The lecturer had 

 succeeded in killiug tlu^sc parasites beautifully, by suspend- 

 ing a bit of tho kidney of the molluscs in weak chromic 

 acid. Thus prepared they were almost entirely free from 

 moss of all kinds, and could bo kept for years in liquid, 

 and mounted in balsam at any tune. 



