250 



MR. H. A. BAYLIS AND LT.-COL. CLAYTON LANE ON 



previously (1809, p. 198) given as liis authority for the latter 

 name Braun (in Schneider, 1789), but expressly mentions that he 

 has been unable to obtain the appendix in which this name 

 appears. We also have failed. Since Stiles and Hassall (1905) 

 do not mention this name in dealing with this genotype, we have 

 presumed that it is a nomen nudiwi and have disregarded it. 



Text-figure 1.* Text-figure 2. 



Text-fig. 1. — Spiroxys contorta. Teniiii)al portion of spicule. 

 Text-fig. 2. — Spiroxijs contorta. Tail of female ; lateral view. 



Sjpiroxys contorta. Female genital organs. (Mature specimen.) 



It is necessary to mention Leidy's (1856, p. 53) Fhysalo'ptera 

 contorta as a possible synonym. His description is as follows: — 

 " Body capillary, most narrowed anteriorly with the posterior 

 four-fifths spirally contorted ; white, with the intestine brown. 

 Lips prominent, constricted from the body, trilobate. Tail short, 

 conical, acute, in the male with narrow ahi3 each furnished with 

 five funnel-shaped pores. 



* For explanation of lettering, see p. 310. 



