A MONOGRAPH OF THE EXISTING CRINOIDS 65 



The following arrangement of the recent comatuUds is adopted herein: 

 Order Comatulida: 



Suborder OHgophreata — 



Superfamily Comasterida — 

 Family Comasteridae — 



Subfamily Capillasterinae. 

 Subfamily Comactiniinae. 

 Subfamiljr Comasterinae. 

 Superfamily Mariametrida — 

 Family Zygometridae. 

 Family Eudiocrinidae. 

 Family Himerometridae. 

 Family Mariametridae. 

 Family Colobometridae. 

 Superfamily Tropiometrida — 

 Family Tropiometridae. 

 Family Calometridae. 

 Family Thalassometridae — 

 Subfamily Ptilometrinae. 

 Subfamily Thalassometrinae. 

 Family Charitometridae. 

 Suborder Macrophreata — 



Family Antedonidae — 



Subfamily Antedoninae. 

 Subfamily Thysanometrinae. 

 Subfamily Peromctrinae. 

 Subfamily Zenomctrinae. 

 Subfamily Heliometrinae. 

 Subfamily Bathymetrinae. 

 Family Notocrinidae. 

 Family Pentametrocrinidae. 

 Family A telecrinid ae . 



PRESERVATION OF SPECIMENS 



As a result of his long experience at the Naples Station, Dr. Salvatore Lo Bianco 

 found that Antedon may be satisfactorUy preserved by direct immersion in 70 per 

 cent alcohol. Leptometra, however, on account of its greater tendency to autotomy, 

 must be killed in 90 per cent alcohol. The vessel shoidd be shaken vigorously in 

 order to hasten death and to prevent the animals from breaking off their arms. 

 When there is doubt about the species 90 per cent alcohol shoidd be used. 



Pentacrinoids should first be narcotized with one-tenth of 1 per cent chloral 

 hydrate, a process requiring from two to four hours. If they are then hardened in 

 alcohol they will remain with the arms perfectly distended. The more advanced 

 stages are best killed with saturated subhmate; but they should remain only for a 

 few moments in this solution in order to avoid damage to the skeletal structures. 

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