AN ATTEMPT TO REVISE THE FAMILY (( LINGUATULIDAE )) 77 



cephalussuperbus. Spencer (1) found spécimens in tlie same species 

 of snake and also in Pseudechys porphyriacus, tiie liead of tlie 

 parasite being firmly imbedded in tlie walls of the lungs. The 

 following additional tacts are taken from Spencer. 



The immature females measured 12 mm. in length, the mature 

 attained to 33 and to 5 mm. in greatest breadth. Anterior end of 

 body not annulated, rest of body with from 65-70 annuli, sometimes 

 slightly irregular. x^nterior half of each annulusspotted, posterior 

 not. Mouth triangular with rounded corners. Primary papillae two, 

 anterior to inner hooks, secondary papillae seven pairs, three 

 dorsal, two latéral and two ventral. 



Maie length 13 mm. greatest width about 2 mm. Génital opening 

 oval with raised lip on 3rd and 4th annulus. An eighth pair of 

 secondary papillae lie just in front of génital pore. 



l hâve counted the rings in Baird's spécimen at the British 

 Muséum, andallowing forany discrepancy which might be caused 

 by the want of précision as to the annulation of the tail, there are 

 75 distinct rings. The pointed tail is a feature of this genus. The 

 mouth is heartshaped the apex of the heart being directed 

 forwards. The hooks are more curved or hooked than in Spencer's 

 drawing. 



20. — POROCEl»HALUS TORTUS n. Sp. 



The young form is very distinctly ringed, the number of rings is 

 about 25. In the mature forms the development of the génital organs 

 has so stretched the skin that the rings hâve disappeared, at the 

 same time the body has become curiously twisted as is shown in 

 the figure, aad this characteristic feature has suggested the spécifie 

 name which I haven given to this form. The céphalothorax which 

 includes the first 3 or 4 rings is well marked ofï from the body. 

 The rings as the body stretches disappear last from the région 

 behind the well-marked neck. 



The hooks are single, the inner pair slightly in advance of the 

 outer. The mouth alniost oval, and a little posterior to the inner 

 hooks, a chitinous half-cylinder runs back from it along the poste- 

 rior face of the oesophagus. 



(1) Journal, micr. Soc, (■>), \XXIV, 189:2, p. 1. 



