14 
supported by a number of fino-er-like ** raysd* which may be compared 
to the ribs of an umbrella. In coitu, the male clasps the body of the 
female by means of this bursa. 
This family is divided into subfamilies, according to the presence of 
certain anatomical characters. The parasites of uncinariasis are now 
classified in the subfamily Strongylinfe,^ which, as its former name, 
Sclerostomin^e, indicated, is characterized by the presence of a hard 
chitinous ‘M)uccal capsule." 
Su-Tofaixiily^ STROZSTG-YLIIN-^. 
Subfamily diagnosis. — Strongylidse : Meromyaria; mouth with more or less com- 
plete chitinous armature, Male with two ecpial spicules; caudal bursa with rays, 
the dorsomedian and dorsolateral being united in a common base. Female with 
two ovaries, except in Ollulanus. 
Type genus. — Strongylus Mueller. 
The subfamily Strongwlinte is in turn divided into a number ot 
genera, of which we may mention here the following: 
Strongylus [Sderostornci]; the sclerostomes, including the colic worms 
of horses and the kidney worms of hogs (but not the kidney worms of 
dogs and man); 
Syrigamus^ including the gape worms of chickens; and 
Vncinaria. the hookworms, including the parasite of uncinariasis. 
It seems very probable that hookworms will have to be divided into 
several different genera, for which a new subfamily will perhaps be 
recognized, but it is not quite clear at present just what genera will 
be admitted. Undoubtedly VncbiariaYvoeliQ]!, 1789. must be adopted 
for one, and in this will probably be placed worms like Uncinaria 
stenoceplicda, possessing ventral lips but not ventral recurved teeth. 
It is quite possible that a second genus (2Ionodontus Molin, 1861, or ! 
Bimostoinum Railliet, 1900) will be recognized for certain other ] 
forms, with buccal lips and with the prominent dorsomedian buccal 
tooth, as was proposed by Molin; probably the new American hook- 
worm will be placed in this genus. Hookworms with the ventral 
recurved buccal teeth, as seen in Uncinaria duodenalis and Vncinaria 
canina will probably be separated into a distinct genus, for which 
Dubinins name Agchylostomoj will be available. To satisfactorily | 
determine the points at issue will require further anatomical study of ; 
a number of different species. For the purpose of this paper it will ; 
be sufficient to call attention to these probable changes. 
«Froin a study of the history of the nematode genera, it is very clear that there 
will have to he a general revision of the technical names of this group. The original |i 
Strongylus, for instance, was a sclerostome, hence the names Sclerostoma and Sclerosto- j 
mime will have to fall into synonymy. It is probable that Metastrongylus will be the | 
correct name for the lung strongyles. Strongylus contortus becomes Hsemonchus ‘ 
contortus. As soon as certain remaining points of this nature are decided, Hassall 
and I will issue a list of nematode genera, together with their type species. 
