xlii 



EXPLANATION OP PLATE III., 



ILLUSTRATING 



DR. MACALISTER'S PAPER ON ASCARIS (ATRACTIS) DACTYLURIS 



(p 294). 



Fig. l. Male. 



a, Tuberculated mouth. 

 6, Stomach. 



c, Ccecal glandular apparatus. 



d, Testicular tube. 



e, Vesiculse seminales. 



f, Intestine. 



g, Vas deferens. 



h, Spicula, large and small. 



t, Glandular apparatus around the dilated lower end of the intestine. 



„ 2. Female. 



a, Mouth, with exserted proboscis. 



b, Commencement of ovarian tube. 



c, Lateral line. 



d, Cardiac constriction of stomach ancTtooth-like processes? 



e, Pyloric valvular constriction. 

 f, Intestinal dilatation. 



ff, Secreting coeca, perhaps renal. 



h, Cornu of coecum. 



i, Ducts of coeca around rectum. 



j, Anus. 



Jc, Ovarian tube, containing perfect ova. 



I, Opening of ovarian tube. 



m, Ccecal glandular apparatus. 



„ 3. Head of the alate variety of A. dactylitis. 

 „ 4. Tail of female. 



c, Glandular coeca, renal ? 



b, Ducts. 



c, Tubercles on the curved cauda. 



„ 5. Fine prolonged tail, found in immature females. 

 „ 6. Termination of oviduct, and ovarian orifice. 

 „ 7, 8. Secreting coeca of males and females. 

 „ 9, 10, 11. Ova with yolk in process of segmentation. 



„ 12, 13, 14. Ova farther advanced, showing the development of the intestinal 

 canal. 



