3o8 DISCOVERY REPORTS 



Shape of trophomeres and gonomeres: Trophomeres elongately cylindrical, gonomeres oval, to 

 about twice as long as broad. 



Number of gonomeres on each trophomere. Up to seven. 



Dimensions of gonomeres: Transverse diameter on an average ^ mm. (Coutiere, 1911c, text), 

 o-i8-o-3 mm. (Coutiere, 1911c, text-fig. i), 0-3-0-4 mm. (Coutiere, 1911c, pi. viii, fig. i). 



Organ of fixation: A cylindrical hollow stalk terminating inside the host as a blunt cone. 



(3) Amallocystis fascialus Fage 



Hosts and manner of attachment: Gnoihophmisia zoea Will.-S., ventral surface of first abdominal 

 segment. Also on Gnathophaiisia ingem (Dohrn). 



Number and arrangement of trophomeres: About 150, arranged in tufts of five or six, with short 

 stalks attached to the external part of the organ of fixation. Total length of the trophomeres with their 

 gonomeres 1-5 mm. 



Shape of trophomeres and gonomeres: Trophomeres cylindrical, gonomeres oval, the latter twice 

 as long as broad or slightly more elongated. 



Number of gonomeres on each trophomere : As a rule one, rarely two or three. 



Dimensions of gonomeres: Transverse diameter 0-2 mm. 



Organ of fixation : Showing a number of excrescences terminating with blunt extremities into the 

 tissues of the host; one excrescence much larger than the others, pointing in anterior direction of the 

 host. 



(4) A?H(illocystis umbeUatus n.sp., type specimen 



Host and manner of attachment : Hoplophoriis grimaldii Coutiere, ventral surface of first abdominal 

 segment. 



Number and arrangement of trophomeres: About 750-1500 trophomeres in tufts of ten to twenty, 

 each tuft with a long slender stalk attached to external part of organ of fixation. 



Shape of trophomeres and gonomeres: Trophomeres conical to cylindrical, gonomeres globular, the 

 distal gonomere somewhat elongated. 



Number of gonomeres on each trophomere: Two or three (as a rule three). 



Dimensions of gonomeres: Transverse diameter 165-225//. 



Organ of fixation: External part broadened, dividing into the basal parts of the stalks. Internal part 

 more or less globular, with one long pointed excrescence extending in anterior direction of host. 

 External and internal parts of organ of fixation connected by a somewhat narrower neck. Between 

 proximal part of root system and organ of fixation a sieve plate. 



(5) Amallocystis umbellattis n.sp., second specimen 



Host and manner of attachment : Hoplophoriis novae-zeelandiae De Man, ventral surface of abdomen, 

 in integument joining first and second segments. 



Number and arrangement of trophomeres : About 500, in tufts of ten to twenty, each tuft with 

 a long slender stalk attached to external part of organ of fixation. 



Shape of trophomeres and gonomeres: Trophomeres conical to cylindrical, gonomeres globular, 

 the distal gonomere somewhat elongated. 



Number of gonomeres on each trophomere : Two or three (as a rule three). 



Dimensions of gonomeres: Transverse diameter 140-195//. 



Organ of fixation : Not examined. 



