74 A. E. SHrPLEY 



16. — PoKOCEPHALUs oxYCEPHALUS Diesing. 



Synonyms. — Pentastomum oxycephalum Diesing. 



Pentastoma proboscideum Crocodili scleropis Rudolphi. 



DiAGNOsis. — « Corpus cylindricum, rectum aut (in minoribus) 



incurvatum, annulato-plicatum, plicis pro magnitudine crescente 



evanescentibus. Céphalothorax minime distinguendus, antrorsum 



acuminatus, truncatus, fronte prominulus. 



Abdominis latitudo retrorsum decrescens 



in minoribus, crescens in maximis ; extre- 



mitas analis truncata. Annuli c. 60, brèves 



lineares, unica série stigmatum instructi. 



Uncinorum curvatura ad basin approxi- 



>ii,»i.iiM..m„iniga mata, apice paene recto. Pars basalis in 



minoribus inflata, spinulosa, in maximis 



Fio-. i9.~ Porocephahts intégra. Fulcrum latum, elongatum, rotun- 



oxycephalus Diesinj?. datum. Orificium oris angustum. Longitudo 



— A, head eniarged ; feminac usque ad 25 mm., latitudo maxime 

 B, animal in natural ,., , ,, , . , ,„ 



size.Ater Diesing. 3,4 mm. Mas multo mmor, long. 10 mm. 



latit. antice 1,7 postice 1 mm. 



» Status imperfectus gracilescens, subfusiformis, corpore incur- 



vato, hamulis geminatis, fimbriisque ad marginem annulorum 



posteriorem impositis. Hamulus accessorius uncilormis gracilis. 



Fimbriae tenues, breviusculae, distantes, in extremitate posteriore 



corporis omnino déficientes. Longitudo 7 mm., latitudo 0,8 mm. 



Ex habitaculo nescio quo translatum, in pulmonibus alligatoris 



promiscue cum exemplaribus minoribus (10-18 mm.) statum per- 



fectum exhibentibus collegi. » — Leuckart. 



Habitat. — In the lungs of Crocodilus sderops (Caïman latirostris 

 and C. sderops) and of Crocodilus americanus (C. acutus) in considé- 

 rable numbers. 



The very remarkable form figured described by J. Chatin (1) was 

 tound in the liver of the Alligaloî' ludus of Cuvier [AlUgalor 

 mississipiensis). It dilïers Irom the type in the numberof the rings, 

 which are about 80, and in the three pronged hooks. In the latter 

 respectif is unique. Nevertheless tlie author places it with P. oxy- 



(1) Ami. des se. nat., zooL, (4), XIV, art. 2, 1882. 



