148 ^- ^- ^^^ W, G. MacCallum, 



in flesh of Lampris guttatus measuring 20 X 30 lines. Neck narrow. 

 Abdomen füll of vessels of three kinds two of which are brown. 

 The drawings which R. gives make it clear that this is a characte- 

 ristic Didtjmosooii. 



K. (D.) lampriclis Lönnbekg. 



From cysts in gills of Lampris guttatus. Worm 30 — 35 mm long 

 paired in cysts but not united. There is a mouth sucker instead of 

 a Pharynx with radiate and circular muscle. No intestine present, 

 the loss of intestine and weak development of musculature connected 

 with the mode of life in cyst (Beaun). 



It will be seen that in no Single instance is the anatomy of 

 these Worms at all completely understood but the external characters 

 are such that it seems entirely justifiable to ränge them in one 

 genas — Koellikeria. The following descriptions of other species 

 recently met with may throw a little light on the finer structure 

 and the relation of the worms to the allied genus Nematohotkrium. 



Koellikeria xiphiados n. sp. 



In cutting up a sword fish {Xiphias gJadius) a fisherman at 

 Woods Hole came upon several cysts embedded in the muscles behind 

 the gill cavity and containing large rounded masses which could be 

 easily shelled out. He shelled out all of them and mutilated all 

 but two so that the relations were much obscured, but in the material 

 which he brought to the laboratory the U.S. Fish Commission, it could be 

 seen that the cj'sts were thick walled and lined with a smooth white 

 tissue. Tliey measured 31 X 36 X 50 mm and two of them which lay close 

 together had a common partition wall. They were situated just 

 under the skin of the host the most distant one being 70 mm from 

 the branchial cavity. From eacli there ran toward the gill cavity 

 a cord made up of blood vessels which extended into the cyst and 

 into relationship with the enclosed parasite in a peculiar way. 

 There was no evident opening in the cyst wall through which communi- 

 cation with the outside could be established. The contents of the 

 cysts were rounded or ovoid masses covered with a very thin, white 

 wrinkled or smooth velvety membrane which ruptured at the sligh- 

 test touch showing the parasite to be made up of irregularly 

 triangulär or wedge shaped lobules connected at the center by their 

 apices. Into this mass there penetrated in every direction the vas- 



