GENUS SCHIZOSIPHON. 777 



characterizes his diagnoses, it is difficult to assume otherwise than that he had in 

 the second instance the actual type of the last-named authorities, and not his original 

 Stichotricha secunda under examination. 



For the advantage of further comparison the drawings of the two forms, as repre- 

 sented respectively by Stein and by Claparede and Lachmann, are reproduced in 

 Plate XLIV. The building up by Stichotricha cornuta of an artificial mucilaginous 

 domicile has not so far been determined. 



Stichotricha aculeata, Wrz. PL. XLIV. FIG. 3. 



Body elongate-lanceolate, about four and a half times as long as broad, 

 tapering from the centre towards the posterior as well as towards the nar- 

 rower anterior region ; the apical extremity of the anterior portion bearing 

 two stout, slightly curved, uncinate styles, each lateral border of this 

 region fringed with very long, fine, hair-like setae ; peristomal cilia largest 

 anteriorly, gradually diminishing in size as they approach the oral aperture, 

 continued as finer cilia up the right-hand or reflected inner border ; two 

 oblique rows of ventral setae and an even border of similar-sized marginal 

 setae ; contractile vesicle situated immediately below the oral aperture ; 

 endoplasts ovate, two in number, with attached endoplastules. Length 

 1-375" to 1-250." HAB. Fresh water, among Lemnceand Sphagnaceae. 



. The two apical styles, double anterior fringe of fine hair-like setae, and two 

 instead of three oblique rows of ventral setae, distinguish this form from 

 Stichotricha cornuta. The species was obtained by Wrzesniowski * in the neighbour- 

 hood of Warsaw, and is reported to pass an entirely free-swimming existence. When 

 swimming the two anterior style-like processes are vibrated with such rapidity as to 

 be scarcely visible. 



Stichotricha remex, Hudson sp. PL. XLIV. FIGS. 9 AND 10. 



Animalcule building and inhabiting a long, slender, cylindrical, brown- 

 coloured tube, whose height may equal or exceed three or four times the 

 length of the body ; body lanceolate, its anterior half when extended from 

 the tube twisted spirally ; the cilia at the anterior or apical extremity of 

 the adoral fringe the longest. Length of body 1-90", of the cylindrical 

 tube 1-20". 



HAB. Pond water, often clustered in groups on the leaves of Anacharis 

 and other water-plants. 



This animalcule is figured and described by Dr. C. T. Hudson in the ' Monthly 

 Microscopical Journal ' for October 1875, under the title viArchimedea (Chcetospira ?) 

 remex. So far as it is possible to decide from his representations, reproduced at 

 PL XLIV. Figs. 9 and 10, and accompanying account given of the character and 

 disposition of the cilia upon the surface of the body, it would appear to correspond 

 most closely with Stichotricha secunda. That it is not a Chcetospira, as was to some 

 extent premised by its describer, is made evident by the setose character of the cilia 

 and their restriction to the ventral aspect. A single spheroidal contractile vesicle 

 was observed near the base of the adoral fringe, and adjacent to this, on the right 

 side, an anal aperture. With respect to the habits of this infusorium Dr. Hudson 

 is more explicit. As a rule it resides at the top of its slender brown-coloured tube, 

 occasionally backing down to the bottom of it, or if suddenly alarmed, as by a tap 



* " Infusorien aus der Umgebung von Warschau," ' Zeit. Wiss. Zool.,' Bd. xx., 1870. 



