34 Moll . 
MOLLUSCA. 
It is only in full-grown shells that the last chambers decrease in size ; 
Lendenfeld. 
Remarks on Barrande, “ Reparation de la troncature normale ou 
periodique de la coquille” ; SchrOder (1). 
Shell of Pupa Candida ; Fischer (6). 
Further observations ou the structure of the Gastropod mantle are 
described ; additional details are given as to the false bipectinate gill of 
the Afonotocardia. There is no trace of a gill in the branchial support of 
the Diotocardia. The sensory function of the false gill is admitted. All 
parts of the mantle seem capable of respiratory function ; Bernard (1). 
Some experiments on the effect of temperature on the chromato- 
phores of Octopus ; Krukenberg (2). 
The movements, due to ciliary action, of the Mussel and of its various 
organs have been investigated. The labial palps act as guards, not guides, 
to the mouth ; the food consists of diatoms, ova, and spores. Particles 
strained off by the gills do not reach the mouth ; M‘Alpine. 
Nematocysts of Coryphella described ; Vayssiere (3). 
The cartilage cells of Cephalopoda compared with those of certain 
morbid growths ; Carrieu. 
Myelocytes of various Molluscs described ; Chatin. 
External organs of Mollusca \ Graber (2). 
Connective tissue ; Krukenberg (3). 
2 . Muscular System . 
Striated muscle fibres do not exist in any Mollusc ; where described 
they have been produced by reagents; Fol (1). 
Striation of muscles of certain Pclecypoda, e.g., Pecten , maintained by 
Blanchard (3, 4) ; the subject more fully discussed by Tourneux & 
Barrois. 
The muscles of a considerable number of Pclecypoda described, with 
figures j Blanchard (2). 
Fol’s statements confirmed ; Roule (2). Admission of the presence 
of striated muscle in Pecten, with criticisms on other parts of Blanchard’s 
paper ; Fol (2). 
In Mollusca , as elsewhere, rapid movement is correlated with striated 
muscles ; Blanchard (1). 
Adductor muscles of Mytilus and Ostrea are very rich in nerves ; and 
there are also many ganglion cells, which may indicate the presence of 
automatic centres in the muscles. There seems no reason why each 
muscle-fibre should not have its own nerve ; Galeazzi. 
The condition of various Pelecypods in respect of their adductor 
muscles is described, and it is suggested the revolution of the axis is 
closely correlated with the reduction of the anterior, and the increase 
and final exclusive retention of the posterior ; Jackson, R. T. (1). 
Movements of the foot and of the contained fluid observed in young 
specimens of Solen ; MObius. 
The muscular layers of the Ileteropoda are described. The fin is found 
to be quite distinct from the trunk muscles, and the same is the case in 
