EXPLANATION OF THE PLATES, 
Tab. I., f. 1. Ascaris similis, d and Pp. 
la. Male, nat. size; 16. head of do. magnified; 1c. female, 
nat. size; 1 d. head of do. magnified; 1 e. tail of do. do. 
f, 2. Ascaris bifaria, nat. size; 2 a, head of do. magnified. 
f. 3. Mermis spiralis, nat. size; 3 @. portion of pady, 
magnified. | 
f. 4. Gordius platyura, nat. size; 4a. head; 4 6. portion 
of body; 4. tail, all magnified. 
f. 5. Gordius verrucosus, nat. size; 5a. portion of body, 
magnified. 
Tab. IL., f. 1. Pentastoma megacephalum, female, nat. size, 1 a. 
head of male? magnified. 
f. 2. Distoma microcephalum, nat. size; 2 a. head, mag- 
_ unified. 
f. 3. Tetrarhynchus rugosus, nat. size; 3. head, magnified. 
f. 4. Tetrarhynchus strangulatus, nat. size; 4 a. head, 
magnified. 
f. 5. Teenia sic nat. size; 5 a. head, magnified. 
yb) 
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