622 : A.-E. SHIPLEY 
ten zu bestehen ; das Kopfende ist ganz anders gebildet als bei der 
Larve ; man findet hier 3 Papillen und von jeder derselben zwei 
hakeniôrmig gebogene, nach links und rechts divergirende Leisten 
abgehen. Die Cirren sind beide Omm2 lang, wenig gekrümmt und 
ist der rechte doppelt so breit wie der linke. Jederseits stehen 
13 prà- und 4post- anale Papillen, von welchen letzteren eine seit- 
lich gerichtet ist, während die anderen sich an der Bauchfläche 
finden, und ausserdem sieht man eine Doppelpapille dicht hinter 
dem After, zwischen Darm und OEsophagus liegt ein Drüsenkôrper 
von 1/54 Kôrperlänge ; der OEsophagus misst 1/7,8, der Schwanz 
1/47 derselben. 
In 1888 von Linstow (1) again described some specimens of 
Spiroptera turdi found in the coats of the stomach of the Redwing 
(T. iliacus), the Blackbird (T. merula) and the Song- thrush (T. 
musicus) and (apparently having wandered), in the stomach of the 
Starling (Sturnus vulgaris). He also mentions that this species is 
a pseudo-parasite in the alimentary canal of Crocidura. 
Von Linstow states that the head of the adult difiers a good deal 
from that of the larva. In addition to the neck frill (Halskrause) he 
describes six rounded papillae which project forward round the 
mouth. On another occasion he found a large number of these 
parasites in a young Blackbird in the act of making their way to 
the walls of the stomach where they come to rest and this they did 
not as might have heen expected from the stomach but from the 
anterior end of the intestine. Which being thinner and soîfter than 
the walls of the stomach offers less resistance to the passage of the 
parasite. Here they are found with their anterior half or two thirds 
of their bodies imbedded in the mucous layer of the intestine and 
with their tails waving about in the lumen. 
In this paper von Linstow surmises that the second host of 
Spiroptera turdi will prove to be an Insect, but in this he was mista- 
ken for about ten years later he recognized the larvae of this species 
in certain immature Nematodes found by Professor Carl J. Cori 
living in the ventral blood vessel of the Earthworm (Lumbricus 
terrestris Lin.). 
(1) Zoul. Jahrb. Syst., III, 1888, p. 109. 
