906 MR. G. M. VEVERS ON NEMATODA FROM MAMMALS 



The opening of the mouth is not terminal, but turns slightly- 

 dorsal wards as in Ancylostoma and Necator, 



The buccal aperture is surrounded by three concentric chitinous 

 rings ; these have no set«. The dorsal gutter is very well 

 marked, and is rugose on the dorsal aspect, 



A figure is given illustrating these two points, as they are not 

 mentioned in the description of the original material. A diagram 

 of the dorsal ray of the bursa in the male is also given. 



Metastrongtlin^ Leiper, 1908. 

 Troglostrongylus troglostrgngylus, gen. n., sp. n. 



In a previous paper (1) I made reference to a pai'asite which 

 I found in the frontal sinus of a Leopard Cat {Felis bevgalensis). 

 At that time 1 Avas uncertain as to its systematic position, and 

 provisionally diagnosed it as a "species inquii-enda " in the 

 genus Synthetocaulus, with which ic has certain affinities. The 

 female, however, is ovoviviparous, and the male has remai-kably 

 long spicules with palmate expansions covered with minute 

 spines, which characters not onl}?- establish it as a new species, 

 but separate it from Synthetocauhis. 



It also has certain characters in common with the genus 

 Hcemostrongylus, a species of which {H. subcrenatus) was described 

 by Railliet and Henr}'-, from the bronchi of a Leopard, in 1913. 

 The disjDosition of the rays of the bursa in this worm is different ; 

 in H. subcrenatus the postero-lateral and median-lateral rays are 

 fused, whereas in T. troglostrongylus the antero-Iateral and 

 median-lateral i-ays are joined. H. subcrenatus, moreover, has 

 no accessory piece (8). 



On these grounds, therefore, I have considered it necessary to 

 create a new genus — Troglostrongylus — for this worm. 



It would appear that the only other Nematode parasite which 

 has the frontal sinus as a habitat is the worm Filar oides muste- 

 larum, which lives in the frontal sinus of the Weasel [Mustela 

 vulgaris) (9). 



The systematic position of F. viustelarttm is somewhat obscure, 

 but it probably falls into the Spiruroidea, which has no affinities 

 with the Sti'ongyloidea, into which 7\ troglostrongylus belongs. 

 A comparison of these tAvo forms shows certain points of simi- 

 larity in structure which seem to indicate parallelism in evolution 

 due perhaps to similarity in habitat. 



Troglostrongylus, gen. n. 



Generic diagnosis. — Metastrongylince : Head simple, two lips, 

 no buccal capsule. Cuticle covered with fine longitudinal stria 

 tions. The bursa of the male is small in comparison with the 

 length of the body. The ventral rays are short, and each formed 



