154 G. A. and W. G. MacCallum, 



parasite is probably a different form from that whicli we have named 

 K. scomberomori. 



Koellikeria haenuiH n, sp, 



On the pseudobranchs of Haemulon flavolineatum (Yellow Grimt) 

 there were found (New York Aquarium) two reddish prominent 

 masses which measured about 6X^X2 mm and wliich were inti- 

 mately attached to the underlying bony tissues. In removing them 

 they were unfortunately somewhat torn so that certain imperfec- 

 tions appeared later in the serial sections. Surrounded tightly by 

 a flbrous capsule the enclosed worm was not to be everted but 

 seemed rather to be embedded in a meshwork of fibrous partitions. 

 Many elliptical yellow eggs were sifted off from the torn surface 

 and these were found to measure 0,2 X 0J5 mni. Since it was 

 impossible to isolate the worms one cannot give an accurate Im- 

 pression of their external form but from a reconstruction of the 

 serial sections its appears as though a very much elongated cylin- 

 drical worm, or more probably two, were coiled together in loops 

 and irregulär twists, invested everywhere with the tissues of the 

 host and in many places adherent or even partly fused together. 

 This idea although not absolutely proven is supported by the fact 

 that each loop or fold in every section contains one cross section 

 of each canal represented and further by the fact that one may 

 trace any canal such as the uterus through fold after fold in suc- 

 cession. 



Two of the encapsulated masses were found and cut into serial 

 sections. They difter somewhat in structure but are unquestionably 

 of the same species. The difference in structure depends upon the 

 fact that in one mass the female organs of reproduction are most 

 conspicuous while in the other the male organs overshadow the 

 female. Elements of both, however, are present in each case. 



In such a complex tangle it was essential to determine first 

 whether two worms were concerned in each mass or only one, and 

 even now after the most painstaking study of these two series we 

 are not absolutely certain, chieliy on account of the imperfection of 

 the specimens but partly on account of the extreme intimacy of 

 adhesion of the folds which obscures the outlines. 



In the first series only one head has been found with terminal 

 pharyngeal bulb, Oesophagus and uterine orifice. In the second 



