MEMORANDA. 19 



The mouth is a slit or tear in the outer surface^ it forms the 

 wide entrance to a conical gullet. 



I have crushed a great number of Glaucomce with the 

 covering glass, and on examining them immediately after- 

 wards, some which were still alive had been torn open at the 

 opposite side of the body, and food was entering there just as 

 at the mouth. 



The particles of food enter the gullet and accumulate at the 

 pointed extremity. Whether they there are admitted into 

 a cell ready constructed, or simply form themselves into a 

 ball, I have not yet been able to see. But when the blue 

 globule (in case indigo is employed to feed them) has attained 

 a certain size, its own weight and the current from without 

 seem to force it into the substance of the body. Here it 

 remains fixed, and, Avith the exception perhaps of a slight 

 change of position as the body becomes filled with globules, 

 it does not move — certainly the food does not rotate. 



The contractile vesicle is situated at the end opposite the 

 mouth, and as the animalcule becomes developed a system of 

 smaller ones, into which the fluid contents of the larger one 

 are forced when the latter contracts, makes its appearance. 

 If a young Glaucoma be dried up the contractile vesicle 

 emits rays or beams, which widen as their distance in- 

 creases from the central vesicle. Sometimes more than one 

 large vesicle are visible. I have seen a discharging orifice in 

 Glaucoma, but could not always distinguish one ; probably one 

 is always present. 



Glaucoma reproduces by self- division. I have never seen any 

 but transverse fissuration, and that frequently. That another 

 reproductive process exists is certain from the fact that 

 Glaucoma is developed from germs, and this, along with the 

 further development of the animal, I shall endeavour at some 

 further time to elucidate. — James Samuelson, Hull. 



Colour of Slood Corpuscles. — In the description usually 

 given of the coloured corpuscles of the blood, I discover an 

 error which ought not to remain uncorrected. 



Thus Kolliker (' Microscop. Anat.,' b. ii, p. 356), "Die 

 Farbe der Blutzellen ist nicht roth wie die des Blutes, 

 sondern blassgelb, und zwar aus physikalischen Griinden 

 heller bei ganz abgeplatteten, etwas dunken bei mehr auf- 

 gequellenen zellen." 



Henle also ('Anat. Generale, t. i, p. 457, trad. Jourdan, 

 1843) says that, " Les corpuscules coloris du sang se dis- 

 tinguent sur-le-champ par leur couleur jauneatre." 



