Botany and Zoology. 421 
perforating bivalve shells. The Doliwm saliva was subsequently 
analyzed b by W. Preyer, and Keferstein published a description of 
the gla 
This was the state of the question when Professor Panceri— 
whose paper has a) been published in the Memoirs of the Royal 
Academy of Naples—undertook its investigation. He associat 
Professor de Luca with him in the work, and to him we are indebt- 
ed for new eo of this ee secretion, These analyses 
a salehoniteg ogenous organic substan ital iy als aleohol. 
Its density was 1-025 in (D and 1 “030 ir in wi be analysis gave: 
11, 
Free sulphuric acid, 3° “42 3°30 
Combined sulphuric acid, 0°20 O15 | 
0°58 0°60 
Combined ec chlorhydric acid, ‘ 
Potassa, soda, magnesia, dete of i a phos. 
hates, be duper? ‘matter and loss 1°80 2°35 
Water, 94°00 93°60 
100°00 100-00 
The mollusks, their shells, and their glands were separately 
weighed, with results as follows :— 
1 Il, 
Molluske. ss 908 grams 520 grams. 
MR a ee ee a 255... ™ 
Glands, . s i 4 oo a _80 sid 
2005“ 855 “* 
os ee the gee constitute from 7 to 9 per cent of the total 
ht eo the al. ; 
oreov — “Pasoel found that on laying open the secretory 
gland af a 5 Halkan there was evolved, within a few moments, a 
considerable quantit of gas, which, on examination, proved to be 
pure carbonic ‘ado e gland, wolghing approximately 45 
grams, yielded 206 ps ‘Gas of t. as, As to the secre- 
= of so acid a fluid from the sane tig: ne of pole’ _ 
it is entirely an: ous to the secre 
ag ei a ; eikalieg blood i 
cannot surprise 
of an acid gastric juice from a similarly in the 
— animals, i . ee weap a 
e following lis list those species lusks ch, like 
the Dolium galea, secrete an acid saliva:— _ 
OPISTHOBRANCHS. 
Pleurobranchidium a Leue. 
Meck. 
& — testitudinarius emg 
“ brevifrons Phil. 
