272 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 

 Synopsis of the distribution of Alaskan fishes — Continued. 



90. 

 91. 

 92, 

 93. 

 94, 

 95, 

 96 

 97, 

 98, 

 99, 

 100 

 101 

 102 

 103 

 104, 

 105 

 106 

 107 

 108 

 109 

 110 

 111 

 1]2 

 113, 

 114 

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 52 

 95 



Coregonug Merckii var 



Coregonus cl upeifortnise 



Coregonus Kennicottii 



Corego7iiis quadrilateralis 



Thymallus aignifer 



Salvelinus mabna 



Salmo purpuratus 



Salm Gairdneri 



Salmo iridens 



Oncorhynchus chouicha 



Oncorhynchus keta 



Oncorhynchus nerka 



Oncorhynchus kisutch 



Oncorhynchus gorbuscha 



A lepidosaurus fcrox 



Alcpidosaurus borealis 



Chipea mirabilis 



SpratelloidiS bryoporus 



Catostomus longirostris 



Plih'chthys Goodei 



Acipenser medirostris 



Chimcera Colliei 



, Haia binoculata 



Eaia parmifera 



Raia batis Pallas 



Squalus acanthias 



Ammoutes aureus 



(App.). leelus hamatus 



(App.). Somniosus microcephalus . 



2M 



+ 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

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+ 



+ 

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 + 



MEXnODS OF MAKIXG AND PRESERVIIVG P1.ASTER CASTS. 



By ANTHONY PIRZ. 



Long Island City, N. Y., 



October 28, 1881. 



Dear Sir : In using tlie method of preserving plaster casts with baryta 

 water and soap as given some time ago, it happens that larger pieces 

 remain damp a long time (years) and yellow iron spots readily appear on 

 the plaster. V. Dechend, in Bonn, recommends brushing the casts with 

 a hot saturated solution of borax twice, and larger pieces five to six 

 times. Then apply twice a saturated and hot solution of chloride of 

 baryta, and finally a hot solution of soap; the superfluous soap solution 

 is to be washed off with hot water, and lastly with cold water. The 

 ■whole treatment occupies but a few hours. 



W. Eeisig, in Darmstad, recommends covering the plaster casts with 

 a solution of India rubber in benzole, or petroleum ether, or bisulphide 

 of carbon. The casts so treated can be w^ashed. 



E. Jacobsen's plan to make pilaster casts stand the washing is: 

 to saturate the casts hot with a solution of a most neutral soap from 

 soda lye and stearic acid in 10 parts of boiling water. 



I. W. Platonoff, in Moscow, i^repares a mass for casts as follows: 

 take 50 parts glue, 35 parts wax, and 15 parts glycerine, with 30 per 



