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1, A characteristic haemiedrical form which is 

 in figures 1 and 2 and also in the Piate. 



illustrated 



Fìg. 1. — Characteristic haemocyar. in-crystals fiom ttie blood of Octopiis vulgaris. 



By slow crystallization the crystals may attain several miUime- 

 ters in length so as to be distinctly visible to the naked eye. The 



Fig. 2. — Haemocyaniii-crystals (projectiìes) from the blood of Octopiis vulgaris. 



crystals, if not too large, when examined under the microscope, give 

 one the impression of small projectiìes (fig. 2), and this is why I shall 



