244) Mr. H.J. Carter on the Organization of Infusoria. 



young indivrduals) ; (c) particles of food; {d) supernumerary 

 scales; {d}) form of scale. Average length of full-grown test 

 1 -400th of an inch. 



Fig. 26. Ditto, with body transformed into an ovisac filled with ovules. 

 Ovule about 1 -4000th of an inch in diameter. 



Fig. 27. Ditto, presenting a development of delicate granuliferous cells like 

 those of Amoeba radiosa. Cells about 1-4 000th of an inch in 

 diameter : (a) capsule of nucleus which generally remains entire. 



Mg. 28. Ditto, showing that the ovules are develo])ed outside the capsule 

 of the nucleus : (a) opercular closure of the test accompanying 

 these developments. 



Fig. 29. Ditto, showing a separation and development of the granules into 

 moveable bodies (spermatoz^ids?) within the test: (a) group of 

 cells entire on their passage outwards. This and the last figure 

 also show the development of the ovules and granuliferous cells 

 in the neighbourhood of the nucleus and its capsule, and the 

 latter apparently growing out of the nucleus. 



Fig, 30. Ditto, showing ovules and granuliferous cells developed in the 

 same test, and together : (a) supernumerary scales. 



Fig. 31. Ovule oi Euglypha alveolata more magnified : (a) showing capsule 

 and nuclear portion ; {b) ditto with pellucid area and central gra- 

 nule ; (c) bearing granules. Do these granules indicate an ap- 

 proaching development of the sarcode, or are they adventitious ? 

 They do not appear in the early state of the ovule, but generally 

 before it has left the test, wherein granules like those developed 

 from the granuliferous cells are frequently seen oscillating round 

 them, {d) development of external layer or diaphane, now giving 

 the ovule a rhizopodous form. 31'. Granuliferous cell more mag- 

 nified ; in this state it progresses under a plane, actinophorous 

 form, or the granules become large, separate, and exhibit much 

 activity within the test. 



Fig. 32. Euglypha alveolata (large variety?), 1 -300th of an inch in length, 

 showing a special apparatus for the development of the granu- 

 liferous cells : (a) animal (?) transformed into a secondary test ; 

 {b) cyst containing granuliferous cells ; (c) tube for their libe- 

 ration when they have become locomotive. The same is seen in 

 the common or smaller variety. 



Fig. 33. Ditto, ditto, with the granules separated and endowed with active 

 locomotive power : (6) shows the structure of the test of E. al- 

 veolata. 



Fig. 34. Euglypha alveolata in conjunction ; the granules of each passing 

 freely backwards and forwards into each other's tests, as if the 

 two bodies had been two drops of water thus united. The union 

 however is only apparent, as we see in the separation oi Arcella 

 vulgaris, which also exhibits a similar conjunction both still and 

 under reptation. 



Fig. 35. Ditto, ditto, separating : (a) the bond of union reduced to a mere 

 thread. 



Fig. 36. Ditto, separation of the fleshy substance completed, tests still 

 united : {a) nucleus in its capsule. 



Plate VI. 



,Fig. 37. Globular sac of seed-like body of Spongilla, partly filled with 

 ovules and granules, of different sizes. 



