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genus Synapta thus had to be changed and got V err ill's name 

 Leptosynapta. The second genus, which was represented by "Syn- 

 apta" kefersteinii Selenka, was on account of the many tentacles 

 named Polyplectana. The third genus has, as proposed by Fisher, 

 got 0 r s t e d's name Synaptula. For K o e h 1 e r and V a n e y's species 

 Anapta? dubiosa Clark established the genus Dactylapta. The last 

 of the genera accepted by Clark is Rhabdomolgus Keferstein. 



In Dr. Morte nsen's collections all the genera exept Anapta, 

 Dactylapta and Rhabdomolgus are represented. Of the genus La- 

 bidoplax only a single species, variabilis Théel is represented, and 

 of the large genus Protankyra not more than 8 species are found. 

 The other genera are nearly completely represented, the only species 

 which are wanting being some of the atlantic species of Leptosynapta, 

 which according to the area of the Expeditions could not be expected. 



The study of these many species has resulted in the division 

 of the subfamily into two different groups: 



1 . Micrournae 



2. Heterournae 



The first group, the Micrournae includes the five genera: 

 Synapta 

 Opheodesoma 

 Euapta 

 Polyplectana 

 Synaptula 



It is characterized by having only one sort of small ciliated 

 funnels, which are quite alike in all the species referred to the 

 group. Besides, the anchor-arms are quite smooth and on the 

 vertex there are usually minute knobs, which may be placed either 

 on the vertex itself or on the sides of it. The articulation between 

 anchor and anchor-plate is always made over a distinct "bridge" 

 across the "posterior" part of the anchor-plates. Curved rods are 

 never found, but miliary granules, usually in the shape of rosettes. 

 The coloration is usually very different and the size of the speci- 

 mens may be exceedingly large. 



The second group 4 the Heterournae, includes the genera: 



Leptosynapta 



Epitomapta 



