DE9CBIPTI0N OF ENOHAVINOS.. 



PLATE XXII {continued.) 



20. Another fia^nre assumed by the Acineta-body. 



21. The ultiniitcly withered s'tatc arrived at by the Acineta-body of an Epistylis, 



after the exhaustion of its contained formative blastema by the repeated 

 production of embryos. 

 22 and 23, Very yovinaf foriiis (probably) of the Epistylis nutans, and apparently 

 the Epistylis Botrytis of Ehrenberg. 



PLATE XXIII. 



The figures in this Plate are after those of Mr. Gosse, (Trans, of the 

 Microscopical Society, and Annals of Natui'al History.) 



Figs. 1. Melicerta I'ingens magnified 300 diameters ; proti'uded and fully expanded ; 

 with the upper part of its tube at a; b, one of the respiratory (.'') tubes. 

 The circular disc above b is the pellet-cup. More in the centre are the 

 jaws and gizzard (oesophageal head), and below portions of intestine. 

 Fig. c, is a much less magnified specimen, but partially protruded from 

 its tube, which is here shown entire. 



2. Limnias ceratophylli. — The head is protruded beyond the smooth tube or 



sheath At e. is the projecting chin. 



3. Notommata aurita. — Viewed laterally and contracted. It exhibits the 



a'sophageal head and jaws, the intestine, the large ovarium, the con- 

 tractile bladder below, the grape -like ganglionic mass in the head, 

 and the tortuous vessels on each side, running the length of the body. 



4. The same animal extended and rotating ; the ear-like ciliated appendage, 



whence the specific name, is seen on each side the head. 



5. Notommata aurita. — ^The muscular system viewed dorsally ; the transverse 



muscles are seen as at t, and the longitudinal crossing them ; the grape - 

 like ganglionic mass is seen furnished with special muscles, as also the 

 gizzard, traced in dotted outline, and the telescopic-working tail or foot. 

 The looped baud at the head indicates the tubular cayities in the 

 head mass 



6. The same animal, showing chiefly its vascular system ; the large sac near 



the bottom of its cavity is the contractile bladder, from which proceed, 

 on each .side, convoluted tubes (tortuous vessels) furnished_ with tremu- 

 lous respiratory tags, as near a and e. 

 6* The dental apparatus of the gizzard is seen in action, 

 7 and 8. The male of Asplanchua priodonta. — Fig. 7, a side ; fig. 8, a front 

 view. The cavity is seen occupied chiefly by the larger testes in fig. 7 ; 

 the sperm-duct is represented opening externally at the pointed base. 

 9. The female of Asplanchna priodonta. — At a, are the gill-like fissures ; a 

 large oral cavity opens into a narrow oesophagus, which ends below in a 

 stomach. One of the strong longitudinal muscles is displayed ; also 

 tortuous vessels and ciliated tags with an ovary 

 10 and 11. The jaws of the Asplanclma detached. 



PLATE XXIV. 



Figs. 1 and 2. Discoplea atmospherica (Ehr.) 



3. Discoplea Atlantica (Ehr.) 



4. Discoiilea sinensis (Ehr.) 



5. Staiarosira construcns fEhr.) 



zz 2 



