468 A. E. Verrill—Marine Fauna of North America. , 
upon Matthiessen’s* formula for the expansion of platinum 
between 0° C. and 200° C. This formula reads, 
Z=1, (1 + 0°00000851 ¢ + 0-0000000035 2’) 
and the reductions are given in the following table: 
TasLe X. 
Platinum. Celsius, Platinum. Celsius. 
1900° 1294° 1500° 1081° 
1 238 1400 1025 
1700 1188 1300 
1600 1129 1200 910 
Of the accuracy of this comparison there are at present no 
means of deciding. Taking into consideration, however, the 
attempts already frequently made, to estimate the temperature 
of flames, glowing metal, etc., it seems likely that the above 
values, in degrees Celsius, are considerably too sm 
Rosetti of Venice gives, for example, for the hottest portion 
of a Bunsen’s burner flame, 1350°. ESCORTS, e Pouillet,t 
the melting points of various metals are as follo 
bole eiade 600! C. Cast-iron _... 1200 re Pelee te 
cucun ce 1400 C. 1300°C. Gold (pure) .. 1200 C., 
asd N..Y., nae 28, 1879. 
Art. LVIL.—Notice of recent Additions to the Marine eats of 
the Eastern Coast of North America, No. 7; by A. E. VERRILL. 
frre Contributions to Zoology from the pi nese 7 Yale College. 
. No. XLIV. 
oe NG the numerous additions Angie io to the marine 
: Swati gen. no 
| Oiroeuha but with the mantle united to the head 
all Cont and to the dorsal side of the slender eehote: — 
asta like a close collar, leaving only a very narrow 
ypening sronnd e base of the siphon, pany and a ventral : 
