PLANKTON COPEPODA OF THE CHANNEL ISLANDS. 97 



14. P-ampontella br-evicomis, Lubbock. 



Generally present throughout the collection, often in great 

 abundance. 



Family : — Cyclopid^e. 



15. Cychpina UtUralis, Brady. 



This species, generally distributed round British coasts, usually 

 taken near to shore or amongst Algse, occurred sparingly in one of 

 the gatherings only, taken off Greve d'Azette. 



Family : — Haepacticid^e. 



16. Delavalia refiexa, Brady and Robertson. 



17. Dactglopus tisboides, Glaus. 



18. Thalestr [ is efausu, Norman. 



19. Thalestr is lonyimana, Claus. 



20. Harpactims chelifer, MiilL 



21. Sarpacticus Jlexus, Brady and Robertson. 



22. Zaus spinatus, Goodsir. 



23. Alteutha depressa, Baird. 



24. Alteutha interrupts, Goodsir. 



25. Idya fwrcaia, Baird. 



26. Scutellidium tisloides, Claus, 



The above eleven species of the large family Harpacticidse, 

 although free swimmers at times and usually found near to shore, 

 often in rock pools, are usually classed as semi-parasitic. In 

 all of them the anterior antennse are of small size, the mandibles 

 and foot jaws being generally large and strong. Their presence in 

 the tow-net is but small indication of their distribution, many of 

 them doubtless being exceedingly common among the rock pools and 

 in the littoral zone. Only isolated specimens occured throughout the 

 collection. 



Family : — Monstpillid^e. 



Great interest attaches to this family through the recent 

 important discovery of Prof. Giard, of Paris, and confirmed by M. 

 Malaquin, that the early stages of one or more species of this group 

 are spent parasitically in the body cavity of certain worms. (See 

 Comptes rendus, 16 Novembre, 1896, and 21 Decembre, 1896, and 

 11 Janvier, 1897.) 



Two species of each of the two genera Thaumaleus and 

 Monstrilla comprised in the family Monstrillida5 appear to be not 

 uncommon about the Channel Islands, viz. : 



27. Thaumahus claparedi, Giesbrecht. 



28. Thaumaleus thompsoni, Giesbrecht. 



29. Monstrilla grandis, Giesbrecht. 



