Mr. H. J. Carter on Microscopic YAdixidiiQ, 113 



an importance in organic creation which calls for a much more 

 extended study of them than they have as yet received. 



EXPLANATION OF THE PLATES. 

 Plate L 



Fig. \. Filaria Medinensis, o\xt\me of, average size of, in Bombay : a, head; 

 b, b, body ; c, tail. The papilla; of the head can only be just 

 seen with a lens of 1 5-inch focus, and the tail is but just visible to 

 the unaided eye ; so these parts are of course not represented in 

 this figure. 



Fig. 2. Ditto, generative organs of, natural size : a, a, ovaries ; b, b, ovisac. 



Fig. 3. Ditto, alimentary canal of, natural size : a, the oesophagus, extend- 

 ing as far as the cross line ; b, b, intestine ; c, rectum. 



Fig. 4. Ditto, mouth and appendages greatly but proportionally magnified : 

 a, mouth (punctiform), in the centre of a circular papilla; b, bor- 

 dered quadrangular space surrounding mouth ; c, c, large papillae, 

 situated vertically (?) ; d, d, rudimentary papillae with other arma- 

 ture, faintly marked, and situated laterally (?). 



Fig. 5. Ditto, greatly magnified view of these portions of: a, anterior por- 

 tion ; b, papillae ; c, oesophagus, enlarged towards the mouth ; 

 dy muscular sheath ; e, peritoneal sheath ; /, portion opposite 

 union of oesophagus and intestine; g, point of their union; 

 h, intestine ; i, hepatic organ covered by the peritoneal sheath ; 

 k, posterior portion, showing — /, continuation of intestine; 

 m, hepatic organ ; n, rectum ; 0, adventitious membrane binding 

 the tail to the surface of the body. 



Fig. 6. Ditto, young of, l-33rd of an inch long, corrugated transversely: 

 fl, oesophagus ; b, muscular sheath of ditto ; c, junction of oeso- 

 phagus and intestine ; d, intestine ; e, hepatic organ terminating 

 some distance from the end of the intestine ; /, portion of intes- 

 tine covered by peritoneal sheath onlg; g, rectum and anus; 

 h, gland opposite rectum. No papillae can be seen on the mouth 

 with the highest magnifying power at this period. 



Plate IL 



Fig. 7. Urolahes palustris, n. sp., female, 1-Gth of an inch long, drawn on the 

 scale of l-48th to 1 -1880th of an inch: a, oesophagus; 6, mus- 

 cular sheath of ditto ; c, point of union of oesophagus and intes- 

 tine ; d, intestine ; e, hepatic organ covered by peritoneal sheath ; 

 /, portion of intestine uncovered by hepatic organ ; g, rectum 

 and aims ; h, vulva ; i, i, generative organs ; k, k, contracted 

 forms of the tail approaching that of Filaria Medinensis. 



Fig. 8, Ditto, organs of generation of, more magnified : a, ovary ; b, ovi- 

 sac ; c, caecal end of ditto ; d, fallopian tube or oviduct, con- 

 stricted and dilated alternately, to afi'ord pouches for retaining 

 the spermatozoa ; e, ovum after impregnation ; /, vulva. 



Fig. 9. Ditto, male, a little shorter than the female, drawn upon the same 

 scale : a, a, organs of generation ; b, penis. 



Fig. 10. Ditto, ditto, organs of generation of, more magnified : a, a, tes- 

 ticular or spermatic sacs ; b, contracted portions of ditto ; c, se- 

 minal duct ; d, penis. 



Fig. 11. Ditto, ditto, anterior and posterior portions of, greatly magnified : 

 a, anterior portion ; b, papillae ; c, pointed end of oesophagus ; 



Ann. ^ Mag, N, Hist. Ser. 3. Vol iv. 8 



