30 NEW YORK STATE MUSEUM 



made on a number of species, such as Megistocrinus 

 depressus, Megistocrinus Ontario, Aorocrinus 

 cauliculus, etc., in which young forms have been found. 

 Variation within the species is common and is . particularly well 

 shown in Megistocrinus depressus. 



A very interesting and fairly complete series of Dolato- 

 crinus liratus shows particularly well the changes in orna- 

 mentation of the dorsal cup which accompany the growth of the 

 individual. The young specimens show a deeply excavated basal 

 region and fewer, coarser ridges or carinae. With growth the basal 

 pit gradually becomes filled up and the carinae become more 

 numerous and finer. The ornamentation finally becomes very 

 complex, as seen in the "Multilira" type, and in older forms the 

 carinae break up forming scattered tubercles. Study of other 

 species, such as Rhodocrinus nodulosus, Dolato- 

 crinus glyptus, Gennaeocrinus eucharis, Gen- 

 naeocrinus nyssa, Gennaeocrinus carinatus, 

 Decadocrinus multinodosus, seems to indicate a 

 general tendency for the ornamentation to reach its greatest develop- 

 ment in mature individuals and to break up or become less pro- 

 nounced in old ones. 



REPORT OF THE MINERALOGIST . 



Chemical and mineralogical investigations. The chemical labo- 

 ratory was cleaned, refitted, new apparatus bought and over $500 

 worth of platintim ware loaned to us. Most of the year has been 

 spent on chemical analyses and investigation. A simimary of this 

 work follows : 



Number of 



quantitative 



determinations 



1 Graphite analyses for Mr Alling's graphite report 63 



2 Analyses for new salt bulletin : 



1 Boiler scale analysis 6 



2 Grainer scale analyses 6 



4 Rock salt analyses 18 



2 Evaporated salt analyses 11 



7 Bittern analyses 49 



I Brine analysis 7 



I Table salt analysis 7 



IBrine research analysis .,,.,.,...,..,..,...... 2 j 



