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PROCEEDINGS OF THE NATIONAL MUSEUM 



MICROCOTYLE POMATOMI Goto 



On July 16 three bluefishes, Pomatomus saltatrix (Linnaeus) , were 

 examined. On their gills were 7, 15, and monocotyleans. 



Family GASTROCOTYLIDAE 



THORACOCOTYLE PARADOXICA Meserve 



FiGXiBE 7, g-i 



A specimen without the anterior end was the only one taken. The 

 large haptor-bearing region bears two rows of large haptoral clamps, 

 about 28 in all; length of area 1.07 mm. Each haptoral clamp has a 

 marginal thickening around its base, and a thinner portion which 

 encloses a cavity that is strengthened by six small radiating bars; 

 diameter 0.053 mm. Vitellaria extend throughout the body except 

 into the tapering posterior end, which bears two pairs of bifid booklets. 



Figure 7. — a-c, Microcotyle otrynteri, new species: a, Whole body, X 43; i, haptors; 

 c, anterior end. d-f, Microcotyle feprili, new species: d, Whole body, X 43; (?, genital 

 openings; f, haptors. g-i, Thoracocotyle faradoxica Meserve: g. Body without anterior 

 end, X 43; A, haptor; i, posterior hook. 



Host. — Scomheromorus cavalla (Cuvier and Valenciennes). 



Specimen.— \J. S. N. M. Helm. Coll. No. 36964. 



Occurrence. — A single specimen was taken from the gill of one of 

 five hosts on July 16. 



This species appears to differ from Thoracocotyle faradoxica 

 Meserve in having two pairs of larger bifid spines at the posterior end 

 of the haptor area and in the character of the haptoral clamps ; but, as 

 the only specimen collected lacks the anterior end and may differ in 

 age from that described by Meserve, it is assigned to his species. It 

 occurred in the same host as Meserve's species. 



