608 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



Genus TUBICOLARIA (XXXII. 379-382). — Figm-e clavate, with a 

 transparent gelatinous case. Eotary organ deeply fissured on the abdominal 

 aspect, and less strongly on the dorsal side, by which it is divided into two 

 lappets, each of which is again partially subdivided into two. Ciliary wreath 

 double, with a space between the rows. Mouth opening directly into the 

 oesophageal bulb, in front of w^hich is a small vesicular organ filled with pale- 

 reddish matter. Stomach long, with thick cellular walls and four glandular 

 organs surrounding its uj^per extremity. Intestine thin and clear, cui^ving 

 slightly forward towards the anus. Two water-vascular canals extend along 

 the body, apparently forming a network at the head, and bearing a couple of 

 vibratile tags. No contractile vesicle observed at their cloacal extremity. 

 Foot, by means of which it adheres to foreign bodies, terminated by a bundle 

 of cilia. Two tentacles extend from the abdominal surface, a little below 

 the mouth ; each has a clear fibrous-looking tract along its centre, and is 

 terminated by a bundle of setae. Embryo with the gelatinous sheath colour- 

 less, but acquiring consistency and a yellowish hue with advancing age. There 

 is a small concretionary mass, apparently surrounded by a sac, affirmed by 

 some to be urinary, in the body of the embryo. 



TuBicOLARiA Najas. — The jaws have 

 four teeth ; and the tactile tubes are hairy 

 anteriorly. This animal is described fidly 

 in the account of the genus ; and xxxn. 

 378-382 will illustrate it. 381 represents 

 the animals of natm-al size, as found at- 

 tached to the roots of Lemna polyirhiza, 



with those of the following genus ; fig. 

 379 represents an animalcule within its 

 case, the rotary organ withdrawn; fig. 

 380, another extended, and without its 

 lorica ; fig. 382, the oesophagus, with the 

 jaws and teeth separate. 1-36". 



Genus STEPHANOCEROS (XXXII. 383; XXXVII. 1-4). — Figure 

 clavate, with five long arms at its anterior extremity, siuTounded by verticils 

 of cilia. Sheath without parallel sides and with strong parallel folds or 

 curves ; either crystalline without any foreign admixture, or sometimes over- 

 spread with small linear bodies like small dead Vibrios or Microglence. It 

 apparently is not tubular, but a solid gelatinous mass envelopes the animal 

 as liigh up as the base of the rotary arms. Acetic acid renders it white, and 

 nitric acid renders its outline more clear. Beneath the cuticle is a granular 

 layer containing nucleated cells. The cilia of the arms appear planted in a 

 granular stratum external to the cuticle, from which they are detached in 

 bundles when subjected to slight pressure. A deep transverse fold of the 

 integument exists at the base of the rotary organ, and contraction throws the 

 peduncle into corresponding folds. Between the skin and the viscera are 

 numerous branching corpuscles resembling cells of connective tissue. These 

 cells correspond with what were described by Professor Williamson in Meli- 

 certa rtngens. They look like smaU globules of ductile protoplasm, and closely 

 resemble the ductile bands seen in Noctiluca miliar is. It is not impossible 

 that these may really be some unchanged remains of the protoplasm of the 

 ovum, which they closely resemble. Four long muscles, contained in sarco- 

 lemmata or sheaths, proceed from the foot anteriorly, branching dichotomously. 

 Alimentary canal composed of a funnel-like oral ca\ity, opening into a still 

 wider proventriculus ha\'ing an intermediate septum and four long bristles 

 with hooked extremities, then a globular maxillary bulb, conducting to a 

 special stomach, which terminates in a short intestine. The oral cavity is 

 lined with fine cilia ; and the proventriculus consists of two membranes, not 

 in close contact, but with a narrow intermediate space. The maxillary teeth, 

 the lining of the maxillary bulbs, and the cesoi^hageal bristles resist the 

 action of li(]uor potassac, indicating a chitinous composition. The walls of the 



