98 



NEW YORK STATE MUSEUM 



form has been seen, their general occurrence through these 

 strata and their great profusion in certain localities are note- 

 worthy. The species concerned have been already described 

 from the Hamilton shales of this state, principally in vol. 7 of 

 the Paleontology of Neiv York, under the names of Echino- 

 caris punctata, Rhinocaris columbina, Rhin. 

 scaphoptera, Elymocaris capseUa, Tropido- 

 caris hamiltoniae, Mesothyra veneris. None 

 of these has ever proven a common species in the Hamilton fauna. 

 Echinocaris punctata has occurred the most fre- 

 quently of any and has been found at two localities in some 

 numbers, viz, Pratts falls, Onondaga co., and Tichenor's gully 

 on Canandaigua lake. Rhinociiris columbina is the 

 next in degree of abundance in the collections of the state 

 museum, specially from the latter locality, and it occasionally 

 turns up elsewhere in the soft shales of the group in western 

 New York. Numbers of specimens were found in these shale* 

 taken from the Livonia salt shaft in Livingston county, together 

 with Rhin. scaphoptera, but these species have not 

 been recorded from the sandy shales of central and easitem New 

 York^. The other species above mentioned have been noted 

 only in single instances from the Hamilton shales of Ontario 

 county. It is thus somewhat singular, though quite in keeping 

 with the nature of the Ithaca fauna as we are learning to 

 apprehend it, to find these species such notable members of 

 that fauna and involved in wholly arenaceous muds. The 

 museum record <of localities now bears the following entries 

 at which species of these phyllocarids have been obtained, in 

 Ithaca rocks (Portiage age). 



2494 Ravine one mile east of Noblesville, Otsego co. 



2471 Ledge on side hill one mile west of Noblesville, 150 feet 

 above valley. 



2495 Laurens, Otsego co.; small ravine in west part of village. 



^The species described as Elymocaris hindii by Jones, from 

 the Hamilton sliales of Arkona, Ontario (Geol. mag. July 1S94, p. 292)^ 

 is Rhinocaris columbina. 



