60 



A. E. SHIPLKY 



v^îN" 



and separated froiii its neighbours by a sbarp-edged, square- 

 profîled furrow. Tbese rings from being very wide (0,7 mm.) 

 posteriorly, become very narrow in front and cease to be dis- 

 tinct at the head. The 

 niouth bas two latéral 

 chitinous lip-ridges, one 

 on each side. The two pair 

 of hooks are elongated 

 acute, with longer basai 

 fulcra than in P. crotali 

 (four times the length of 

 the exserted portion of 

 the hook), but with a 

 much shorter basai pro- 

 cess. The surface of the 

 skin is covered over with 

 numerous irregularly ar- 

 ranged circular dots with 

 depressed edges ; thèse 

 are most numerous about 

 the head and forepart, but 

 become fewer posteriorly. 

 There were no ova in any 

 forward state of develop- 

 ment. » — Macalister. 



Habitat. — In the peri- 



toneal cavity of the large 



Fig. 6. - Porocephalus aonycis Macalister. - Indian Otter, A OnifX lepto- 



A, entire animal X 6 ; B, enlarged view , . ' \ t 



of mouth to show « lip ridges»; c, hook ''^^^ [Lutra cinerea), trom 



X 150. the river Indus. 



3. — POROCKPHALUS ARMILLATUS WymaU {{] 



Synonyms. — A. — AnuLT Forms. 



Linguatula armillata Wyman. 

 Pentastomum polyzonum Harley, Leuckart. 



(1) Proceed. Boston, Soc, II, 1848, p. 59. 



