GORDIID.E. 35 



5. Meemis, nov. sp., Siebold MSS.? 

 Hah. Abdomen of Decticus verrucivorus. 

 From the collection of M. Siebold. 



6. Mermis spiralis, Baird. (Tab. I. f. 3.) 



About 7 inches in length and ^ mill, in breadth ; of a red colour, 

 rigid and twisted into many spiral convolutions. Anterior and 

 posterior extremities obtuse. Body of nearly equal size through- 

 out and quite smooth. 



Hob. Abdomen of a species of Grasshopper from Rio Janeiro. 



7. Mermis rigidus, Baird. 



Body of a light amber colour, smooth, and very shining, narrow 

 at upper extremity, very soon becoming thicker, and termi- 

 nating at inferior extremity in an obtusely conical point. The 

 animal is very rigid and stiff throughout its whole length. 



Length 10j inches, breadth about \ a line. 



ffab. ? 



From old collection. 



XXI. GORDIUS. 



Gordius, Linneus et Auctorum. 



A. Skin smooth. 



1. GORDIVS AQGATICL'S. 



Vitulus aquaticus, Gesner, Aquat. 463 ; Aldrovandus, Inspect. 720, 



t. 765. 

 Seta aquatica, Merret, Pin. Rer. Nat. 207. 

 Gordius aquaticus, Linn. Faun. Suec. 2068 ; Syst. Nat. Ed. 12, 



1052 ; Gmelin, S. N. 3082 ; Enc. Meth. t. 29, f. 1 ; Bosc, Hint. 



Nat. Vers,\. 230, t. 8, f. 4; ITurton, Brit. Faun. 130 ; 1 Pennant, 



Brit. Zool. iv. 27 ; Berthold, Cher den Ban des Wasserkalbet ; 



Lamarck, An. S. Vert. iii. 220 ; 2nd ed. iii. 671 ; Dujardin, Ann. 



Sc. Nat. 1842, xviii. 142 ; Hist. Nat. Helminth. 297 ; Siebold, 



Wiegm. Arch, fur Naturg. 1838, iv. 302; 1843, ii. 302 & 307 ; 



E/Uom. Zeitung. 1842. 

 Gordius seta, Midler, Hist. Verm. i. pt. 2, 30, n. 161. 

 Dragonneau de Claix, Charvet, Now. Ann. du Mus. 1834, iii. 38. 



Ili'li. Fresh-water ponds and ditches, &c. 



Male, from the collections of Professor Bonelli and Dr. Siebold. 



Female, from the collection of Dr. Leach and old collection in 

 British Museum. 



