DURING HIS SOJOURN IN THE WESTERN PACIFIC. 559 



III. NEMATODA. 



The collection of Nematodes made in the East by Dr Willey comprised four 

 genera and six species, one of the latter new. I am much indebted to Professor 

 M. Stossich of Trieste who named the specimens for me, and has furnished me with 

 a copy of his diagnosis of the new species which I append (pp. 560, 561). 



I. PHYSALOPTERA OBTUSISSIMA Molin. 



Molin. SB. Ak. Wien, xxxix. 1860, p. 654. 



Drasche. Verb. Ges. Wien, xxxii. 1882, p. 127. 



Stossich. Boll. Soc. Adriat. xi. 1889. 



This species is recorded from the stomach and intestine of the following snakes : 

 Erythrolaviprus aesculapi, L. {Coluber); Spilotes pullatus, L. (Coluber); Xenodon severus, 

 L. (Coluber) ; Lachesis lanceolatus, Lacep. (Coluber). The remaining names of hosts are 

 Fitzinger's and cannot be identified : Ophis coeruleus, Ophis rhodogaster, Ophis treuen- 

 steinii, Pseudophis cinerascens, Cloelia plumbea, Cloelia fasciata, Lygophis regius. 



My specimens were taken from the intestine of the snake Dipsadomorphus irregu- 

 laris (Merrem) found by Dr Willey in New Britain. As all the snakes from which 

 this species of Nematode has hitherto been taken are South American this discovery 

 materially increases the geographical range of the parasite. 



II. PHYSALOPTERA RETUSA Rud. 



Spiroptera retusa, Dujardin. Hist. nat. d. Helm. 1845, p. 104. 



Diesing. Syst. Helminth, ii. 1851, p. 236. 



Molin. SB. Ak. Wien, xxxix. 1860, p. 652. 



Schneider. Monogr. d. Nematod. 1866, p. 65. 



Stossich. Boll. Soc. Adriat. XI. 1889. 



This species has hitherto been recorded from the oesophagus, stomach and intestine 

 of the following Lacertilians : Tupinambis teguiooin, L. (Lacerta) ; Tupinambis nigro- 

 punctntus, Spix ; Ameiva snrinamensis, Laur. (Seps) ; Scleroporus undulatus, Merr. 

 (Uromastyx) ; Amphisbaena alba, L. ; Ophiodes striatus, Spix. (Pygopus). The Podinema 

 scripta and Euprepis Spixii of Fitzinger, also mentioned as hosts of Ph. retusa, are 

 nomina nuda. 



The above are all Lacertilians and all from Brazil. My specimens were taken 

 fi-om the intestine of the "malagea" snake Dipsadomorphus irregularis (Merrem) taken 

 in New Britain. Thus the zoological and geographical distribution of the parasite is 

 widely increased. 



