NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



203 



Nitzscli (1829) states that the worm is commonly found sewed in 

 a loop through the gastric epithelium with the boss marking the 

 point of contact for the anterior extremity, but other writers have not 

 found this. 



Stossich (1897) states that the esophagus is distinctly divided into 

 three parts, but gives no details and no one else mentions it. Could 

 he have regarded the pharynx as one part ? 



Genus PROTOSPIRURA Seurat, 19146. 



Synonym. — Splroptera lludolphi, 1819, of authors. 



Generic diagnosis. — Spirurinae (p. 199) : Cuticle transversely 

 striated. No lateral alae in adult. Mouth with two large lips, each 

 divided into one median and two lateral lobes and each lobe bearing 

 teeth. Four head papillae, one at the base of each of the lateral lobes. 

 Bursal alae in male. Spicules iuie(iual. 

 Vulva in middle or anterior portion of 

 body. Uteri divergent. 



Ty pes pedes. — Protosplrura nam id tea 

 Heurat, VJUh. 



The only species other than tlie type- 

 species included by Seurat in his new genus 

 is what he calls Peotospirura mut'is (Wer- 

 ner, 1782) Seurat, 1915. I do not regai'd 

 Lamhrici maris Werner as available. By 

 some inadvertance Seurat in describing the 

 type-species of his new genus states that the 

 cloaca opens a short distance in front of 

 the anus. It is possible that he means that the cloaca opens a short 

 distance in front of the tail end. 



Tig. 2G4.— PROTOSPIRURA LABIO- 

 DENTATA. HEAD, VIEWED FROM 

 THE FRONT. ENLARGED. AFTER 

 VON LiNSTOW, 1S99. 



ANALYTICAL KF.Y TO SPECIES OF PKOTOSPIKURA. 



1. ilaximum length of tVnuiIes over T.j mm. Eggs over 55 /^ long. 



Protospirura ascaroidea, p. 207. 

 Maximum lengtli of females less tlian .55 mm. Eggs not over 50 (i long 2. 



2. Eggs loss than 20 ^ long Protospirura labiodentata, -[>. 20S. 



Eggs more than 40 /j, long rrotospirura »;»ns, p. 204. 



Seurat (1916) adds P. numidiea from a rodent. See Addendum, 

 page 224. 



PROTOSPIRURA LABIODENTATA (von Linstow, 1899) Hall, 1916. 



Synonyin. — Spiroptera lahiodentata von Linstow, 1899. 



jSpecific diagnosis. — Protospirura (p. 203) : Mouth with 2 large 

 lips, each divided into three lobes and each lobe bearing one large 

 tooth and two smaller teeth (fig. 264). A papilla is situated at the 

 base of each lobe. 



Male unknown. 



