ZOOLOGICAL AND BOTANICAL A880CIATION. 49 



In length it is more than double that of either D. Grayii or D. Fu- 

 reedpoorensis ; and the expanded hammer-head-like portion is exceedingly 

 well-marked. 



There is something highly characteristic in the manner in which the 

 peculiar longitudinal band (which seems to be of a different structure 

 from the rest of the body) terminates towards the 

 hammer-headed extremity : in D. Fureedpoorensis it 

 ends without expanding laterally; in D. Grayii it ex- 

 pands as shown in the previous figure ; while in D. 

 Cantorii it terminates in the manner here represented. 



There appears to be no trace of this genus in the fine collection of 

 annulose animals at the Jardin des Plantes, Paris. Full details, with 

 carefully drawn-up specific descriptions, will shortly be forwarded to the 

 Linnaean Society ; in the meantime, this brief notice may cause some at- 

 tention to be paid to these little animals, which doubtless are common 

 on the continent of Asia ; and the author would be happy to receive spe- 

 cimens, so that he may be enabled to complete his account of the group. 

 He is led to believe that, in addition to the localities given above, they 

 occur likewise in the neighbourhood of Kandy (Ceylon) and near Cal- 

 cutta. 



The^following paper by John Barker, A. B., M. B., M. It. I. A., Hon. 

 Sec, was read (vide p. 23, anted) : — 



ON THE TEMPERATURE OF PLANTS. 



The subject of the temperature of plants has occupied the attention of 

 many physiologists ; and, although repeated experiments have been made 

 from the time of John Hunter to the present day, we are still at a loss 

 in the matter : as yet no definite determination has been come to, of the 

 causes which give rise to a specific difference between the temperature 

 of growing vegetation and that of the surrounding air. In one case the 

 proposition has been fully determined, — I mean, wherever oxygination 

 is taking place, as in germination, fructification, and the growth of fungi. 

 The process of malting exhibits the first : here a large quantity of carbonic 

 acid and water is produced, and this process is generally represented by 

 the formula — 



Starch. Sugar. 



2 (C, a H,oO 10 ) + 20 = CO, + C w H„O w + 8HO. 



ZOOL. A BOT. SOC. PROC — VOL. IT. H 



