2 W. BALDWIN SPENCER. 



he has found iii the luugs of a black snake (Pseudechys por- 

 phyriacus) in Victoria. 



On searching through such literature as could be obtained 

 in Victoria I found that Dr. Baird had described a specimen 

 which was obtained in the mouth of a dead copper-head snake 

 in the Zoological Society's Gardens, London, under the name 

 of Pentastomum teretiusculum. Though the description 

 is somewhat incomplete, there can be no doubt but that the 

 form with which this paper deals is the one found and first 

 named by Dr. Baird. ^ 



Since the time when Leuckart^ published his classic mono- 

 graph on the group — now more than thirty years ago — modern 

 methods of investigation have rendered it possible to study 

 more closely the minute anatomy of such an animal as Penta- 

 stomum (where continuous sections are almost a necessity) 

 than could be done in earlier days, though to those of us who 

 now depend upon such methods the accurate and brilliant 

 results achieved by the older workers are a continual source 

 of admiration. 



Despite the recent work of Hoyle/ Lohrmann,* Stiles,^ and 

 Macalister,^ I have thought it worth while to publish the fol- 

 lowing account of the anatomy of P. teretiusculum, which 

 has been made as complete as possible. In doing this I have 

 endeavoured to give (1) descriptions and figures of the ex- 

 ternal anatomy, (2) schematic representations of the structure, 



» 'Proc. Zool. Soc.,' London, 18G2, p. 114. 



2 'Bau und Entwickeluugsgeschichte der Pentastomen,' Leipzig, ISGO. 



' "On a New Species of Pentastomum (P. protclis) from the Mesentery 

 of Proteles cristatus; with an Account of its Anatomy," 'Trans, lloyal 

 Society of Edinburgh,' 1883, with pis. xxvii and xxviii. 



■* " Untersuchungen iiber den Anat. Bau der Pentastomen," ' Arch. f. 

 Naturgesch.,' ISS'J. I am unable to refer directly to this work; my knowledge 

 of it is based upon references thereto in Stiles' monograph. 



^ " Bau und Entwickeluugsgeschichte vonPentastonium proboscideuni, 

 Rud., und Pentastomum subcylindricum, Dies.," ' Zeit. f. wissen. 

 Zool.,' Band. Hi, Part 1, 1891, p. 83, Taf. vii and viii. This paper also con- 

 tains a full bibliography. 



* 'Proc. Roy. Irish Acad.,' 2nd series, vol. ii, 1875-7, p. G2 : "On Two 

 New Species of Pentastomum." 



