1915] MacCallum: Ectoparasitic Trematodes 409 



Measurements — tail end. 



From bend of uterus to termination 15 mm- 



Tail width at bend of uterus 14 mm. 



Tail end of vitellaria from end .12 mm. 



Tail end from beginning of ovary 1.35 mm. 



Width of ovary near tail end .02 mm. 



Width of vitellaria opposite tail end of ovary 02 mm. 



Head end. 



Tip of head end from bend of uterus .13 mm. 



Width of worm across bend of uterus .12 mm. 



End of vitellaria at bend of uterus from tip end 15 mm. 



Vas deferens seen alongside vitellaria through much 

 of its course, width of one column of uterus near 

 anterior end, wide part 02 mm. 



Width of adult worm 60 mm. 



Length, probably 5 or 6 inches 



Egg 005 mm. 



Atalostrophion promicrops nov. sp. 



On March 31, 1914, portions of a worm of the same genus 

 as A. sardx were found on the gills of a large Jew fish, 

 {Promicrops guttatus) at the New York Aquarium. It was only 

 discovered after the body had been disposed of, so that unfor- 

 tunately the branchial cavity was not examined as it should 

 have been, for no doubt more worms would have been found 

 under the mucous membrane there. 



One portion of worm found was about two inches long by .60 

 mm. wide. It was more muscular than that found in Sarda 

 sarda and not so thin and delicate. It contained the same organ ; 

 the uterus, however, only showed a single tube filled with eggs. 

 This, too, is a new species and will be fully described when 

 further material is secured. I would in the meantime propose 

 the name Atalostrophion promicrops. 



The eggs are about of the same size and color as in A. sardae 

 and the body, although thicker, is about .60 mm. in width. 



Since the present paper has been in press, I have had occa- 

 sion to examine a number of fish fresh from the sea, among 



