138 



Mr. P. H. Carpenter. 



[Apr. 12, 



glucinum was determined in turpentine, of which the specific heat was 

 found to be 0*4231, and with the following results : — 



I 0-4326 



II 4264 



III 0-4357 



Mean 0-4316 



and with a mean error of 0*8 per cent. Making a correction for the 

 impurities contained in the metal, its true specific heat would be 

 0-4453, whence if the atomic weight is 13'65, the atomic heat becomes 

 6*08. This must, therefore, be the true atomic weight, and not two- 

 thirds of this, or 9'1. 



The number found by Nilson was somewhat lower than this (0*4079), 

 and the above results may be slightly too high, firstly from hygroscopic 

 moisture, and secondly from heat produced when the liquid was absorbed 

 by the porous metal. About 0'66 gramme of the metal was used for 

 the determinations, and it was compressed to a compact disk in a steel 

 mortar. 



The author is continuing the research. 



III. " On a New Crinoid from the Southern Sea." By P. 

 Herbert Carpenter, M.A., Assistant Master at Eton Col- 

 lege. Communicated by W. B. Carpenter, C.B., M.D., 

 F.R.S. Received March 15, 1833. 



(Abstract.) 



Among the collections of the late Sir Wyville Thomson, a small 

 Comatula has recently been discovered which was dredged by the 

 "Challenger" at a depth of 1,800 fathoms in the Southern Sea. 

 Although it is unusually small, the diameter of the calyx being only 

 2 millims., the characters presented by this form are such as to render 

 it by far the most remarkable among all the types of recent Crinoids, 

 whether stalked or free. The name proposed for it is Thaumatocrinus 

 renovatus. 



It has only five arms, and in this respect resembles Eudiocrinus. 

 But the basals, instead of becoming transformed into a rosette as in 

 that genus, persist on the exterior of the calyx and form a closed ring 

 of relatively large plates, which rest upon the centrodorsal. They 

 support a ring of ten plates, five of which, alternating with the 

 basals, bear the arms and are therefore the radials. These radials. 

 however, do not meet one another laterally ; for they alternate with 

 five plates slightly smaller than themselves, which rest upon the 



