History of the Hairy -bached Animalcules. 397 



inch. In form this resembles G. larus, being rather broad in 

 proportion to the length. At first sight the body seems quite 

 smooth, but on bending strongly to either side, it is seen to be 

 clothed with hair, as it were agglutinated in locks, like human 

 hair wetted ; for these locks then separate. The outline of the 

 head is slightly five-lobed, and on each side of the face there 

 are several long slender bristles diverging laterally, like the 

 whiskers of a cat. Along the ventral surface run two rows of 

 vibratile cilia, extending the whole length ; they appear to be 

 longest near the front. I distinctly saw them in vibration 

 throughout, and the motion communicated by them to the 

 floating atoms was strong and conspicoKras ; these, however, 

 were hurled backwards longitudinally only, with no trace of 

 vortices. 



The mouth, oesophagus, and alimentary canal do not differ 

 from those of the next species ; but the surface of the body 

 presents something peculiar ; it appears to be thrown into a 

 number of transverse or annular wrinkles, possibly produced 

 by the arrangement of the hair in locks. On the front third a 

 number of transversely oblong dark spots are seen, arranged 

 quincuncially with much regularity ; their nature I could not 

 determine, unless they also be divisions of the matted masses 

 of hair; they are certainly not spots of positive colour. The 

 whole animal is colourless; the intestine was granular, but 

 appeared empty ; it would not imbibe carmine. No reproduc- 

 tive organs were discernible. The forked toes are blunt at 

 the tips ; they are sometimes widely separated ; that they are 

 soft was manifest when one was bent by pressure against the 

 glass, as the animal turned. It possesses the power of con- 

 traction and elongation to a slight extent ; in the former the 

 transverse wrinkles become more distinct, and the animal 

 becomes shorter and broader. My specimen was very active, 

 crawling nimbly, and swimming with much swiftness, but in 

 an unsettled wandering manner. The body is very flexible, 

 frequently turning so short as to be bent double. 



Sp. 6. C. Slackiae (Gosse). (Plate i. Fig. 7.) This undescribcd 

 species I venture to dedicate to a lady, to whose facile and ele- 

 gant pencil microscopists are so much indebted for the beautiful 

 and truthful delineations of The Marvels of Pond Life. I ob- 

 tained it in January, 1851, from the sediment of the garden-tub 

 already alluded to. Its length was l-135th of an inch ; its greatest 

 breadth 1 -600th. The proportions are nearly those of G. larus, 

 but the outline of the head is the half of a short ellipse, without 

 lobes, and it passes, with an abrupt angle, into the neck, which 

 is somewhat more slender in proportion to the body than in the 

 species just named. This form of the head gives a peculiar 

 aspect to the physiognomy, and is the first appearance of a 



