30 HANDBOOK OF INVERTEBRATE ZOOLOGY. 



d. The large granular oval eggs (Fig. 14, i) which lie 

 in the partitions between the radiating tubes, under the 

 layer of endoderm. 



VI. THE STRUCTURE AND GROWTH OF THE 

 ASEXUAL FORM OF A CAMPANULARIAN 

 HYDROID. 



(Eucope obliqua). 



Although this description was written from a specimen 

 of the above species, almost any Campanularian Hydroid 

 may be used to verify the points, since the differences 

 between them are slight. 



They may be found in abundance, in the form of brown 

 moss-like tufts, near low-tide mark, on plants and stones, 

 on the lower surfaces of overhanging rocks, on the timbers 

 of wharves, the bottoms of boats, or on floating drift-wood 

 or algse. 



The living animals should be examined in sea-water, as 

 it is difficult to preserve satisfactory specimens. If speci- 

 mens are to be preserved for laboratory work, select those 

 which are as clean and free from foreign matter as possi- 

 ble, and plunge them, alive, into a saturated solution of 

 picric acid in fresh water. In three or four hours they 

 may be transferred to seventy-five per cent alcohol, or to 

 a mixture of equal parts of alcohol, glycerine, and sea- 

 water. After about twelve hours the specimens which 

 have been placed in alcohol may be transferred to ninety 

 per cent alcohol for permanent preservation. 



I. Examine with a low power a portion of a living 

 colony in a watch-crystal of sea-water, or a portion of a 

 preserved specimen in a small quantity of the preserving 

 fluid, and notice : — 



