TECHNIQUE. 



For preservation of the material I used a one-cjuarter sat- 

 urated solution of picric acid with 2% of sodium chloride ad- 

 ded, Erlicki's fluid with the same addition ; end l/^'X osraic 

 acid followed by Erlicki's fluid. The last two methods pre- 

 serve external structures and the general shape of the animal 

 very well, but the first method is much better for internal 

 structures. 



SYSTEM ATICPART. 



Cassiopea Xamachana, species nova . 

 Diagnosis . The umbrella is concave on the aboral side 



forming a sucking disk. The number of rhopalia is regularly Kl 

 but often from 17 to 23. when there are 1(3 rhopalia there are 

 80 short obtuse lobes in the margin of the umbrella, separated 

 by deep grooves on the surface of the umbrella (in each of the 

 16 parameres 3 velar lobes between 2 ocular ones.) The exum- 

 brella is marked by a white circle at the periphery of the con- 

 Qavity ; from this there extends outward a white band along 

 each marginal lobe, and in the radius of each rhopalium there 

 is also a white band tapering centrally from this circle to a 



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