(52 A. E. SHIPLEY 



Ou carefully comparing Wyman's description of Linguatula 

 armillata witli Harley's genus (1), I find no material points of diffé- 

 rence except that of size. His largest females measured 6 inches in 

 length, but the ligures mentioned below shew tliat tlie size varies 

 considerably, and in any case it is hardly a feature of spécifie value. 



I add a few more détails from Wyman (2), The body is tapering 

 from the middle backwards. Rings prominent, placed a littie obli- 

 quely, 18 well defmed, and 4 very slightly marked on head. Two 

 prominent papillae in front of mouth. Génital orifice in front of 

 anus. 



Maie. — 4,6 cm. long, conical, tapering from the head back- 

 wards. Fourteen distinct rings, and four poorly defined on the 

 head.Besides the two papillae in the front of the mouth, there is 

 one in front of each hook. 



I am inclined to follow Bell and Lohrmann in regarding P. pro~ 

 telis as a young form of P. polyzonum {P. armillatus) and like the 

 last mentioned writer I do not fmd any essential différences be- 

 tween the présent species and the P. constrictum of von Siebold and 

 the P. leonis of Wedl. Leuckart regards P. Diesingi of van Beneden, 

 found in a Mandrill {Cynocephalus maimon), as a young form of 

 P. polyzonum. 



In P. proulis, found in a cyst in the mesentery of Proteks crista- 

 tus, the stigmàta are arranged in irregular rows on ail the segments. 

 The maies were 13-17 mm. long with 16 or 17 annuli, the females 

 20-25, with 18-22 annuli. In P. leonis, the length is 14-18 mm. and 

 the rings 20 in number. 



In a spécimen in the Cambridge Muséum, 95 mm. long, I counted 

 19 annuli, the lirst of thèse was hardly distinct from the head, and 

 the uncertainty inthis région may hâve given rise to the discrepancy 

 which exists in the statements as to the number of rings in this 

 species. In the figure given byHarley, 17 distinct rings canbe seen 

 on the body, and two or three less distinct fused with the head. 



4. — POROCEPHALUS BIFURCATUS Diesiug. 



Syxonyms. — Pmlasiorna furcocercum Diesing. 

 Pentastomum bifurcatum Diesing. 



(1) Proc. Zool. Soc. Lnnd., part XXV, 1837, p. Ho. 



(2) Proc. Boslou Soc, IX, 18(i;i-U3, pp. 17'J and 180. 



