PARASITES OF FISHES OF THE WOODS HOLE REGIOIf. 427 



CESTODES. 



2. Discocephahi III pileatiim Linton. Spiral valve. 2, pp. 7S1-7S7, pi. x, fig.x. 1-7. 7, p. 272. Rare; 



heads biiried in mn<'()ug membrane n£ spiral valve; difficnlt to remo\'e withont breaking. 



3. Anthobothrmin laciiiiahiiii Linton. Spiral vah-e. 2, pp. 754-759, pi. m, tigs. 10-13, and pi. iv, tigs. 



1-.3. T, p. 272. Jnly 17, 1S99; from one host, 1. July 22, 1!^99; from one ho.st, 1. Aug.], 

 1S99; from one host, 1.50. Aug. 21, 1899; from one host, .5.'1 Aug. 25, 1899; from one host, 

 numerous. .July 20, 1900; from one host, 7. 



4. Crossuhiithriiiiii iuh/iixIiiih Linton. [Orygmatoliiitliriiiin nnijustnin Linton.] Spiral valve. I, pj). 



468-469, 1)1. HI, figs. 1-3. 2. pp. 796-799, pi. vii, tig. 3. 7, p. 272. July 22, 1899; from one 



host, 11. Aug. 1, 1899; from one host, 12. .\ug. 25, 1899; from one host, 3. July 20, 1900; 



from one host, 24. 



Among the specimens collected in 1900 two tyjies were represented, one elongated, very slender, 



almost hair-like, attaining a length of 30 nmi. with elongated and squarish segments; the other much 



shorter with moniliform segments beginning 10 mm. back of head. The generic name OriigmiitiihiAli- 



rium must be discontinued for this form. It and Croxsohotltriutn, jirobably, are generi<'ally the same — 



i. e., bothria cruciformly arranged, each with a .single auxiliary acetabulum. The latter does not 



resemble anterior end of Imthriuni of Monorygmn. Of frequent occurrence, sometimes abundant. 



5. PJidreiiihothriiiiii hisiiiiii Linton. Spiral valve. 1, pp. 474-^76, pi. iv, figs. 24-29. 2, jip. 819-820. 



7, ].. 272. .Vug. 11, 1899; from one liost, .50. Aug. 21, 1899; from one host, 146. Aug. 25, 1899; 

 from one host, numerous. July 20, 1900; from one host, 3. 

 11. J'liiiriiiiliotlinuiii Irilnciiliitmii up. nit\. Spiral valve. [PI. x.xvi, fig. 292.] .\ug. 11. 1899; from one 

 host, 10. Aug. 25, 1899; from one ho.st, few. July 20, 1900; from one host, 16. 

 Head larger than that of J'. Idxiiim. The most striking difference is in the posterior ends of 

 bothria, each of which has three loculi (arranged in a transverse row) instead of the numerous small 

 loculi characteristic of P.liiaiiim. Dimensions of a si)ecimen in sea water, in millimeters: Length, 25; 

 length of head, 0.71; breadth of head, 0.76; thickness of head, 0.63; breadth of neck, 0.36; thickness 

 of neck, 0.13; distance to first distinct segment, 4.5; length of last segment, 3; breadth, 0.78. 



7. I'liilyliolliriimi ceniimm Linton. Spiral valve. 2, pp. 820-823, pi. viii, figs. 8-10, and \>\. ix, lig. 1. 



8. Ti'InirhynchiiK bimilralns Linton. 1 [Rliyiirlioliotliriimi himlmliim^, pp. 479—486, pi. i\', figs. 9-23. 



2, Jip. 857-861, 1)1. XIV, figs. 10-12, and pi. xv, fig. 1. 5, p. 452. 7, p. 272. Sometimes very 

 uliundant in the pylorus, the heads often end>edded in the mucous nuMulirane. 



9. Trinirliyiirhiix hlrolor Bartels. 4, pp. 813-815, pl.i.xviii, figs. 5, 6. 



10. Ti'Irrirliyiicliiix sp. Cysts, stomach wall. 4, pp. 807-808. 



11. Cysts containing degenerate connective ti&sue sometimes fomid in tl)c walls >•( aliioentary tract. 



TREMATODES. 



12. (iaslrroKliiiiiiini iiri-iKihuii Linton. Sjiiral valve. July 22, 1899; from one hosl. 5 larger, with ova, 



3 smaller. 

 Length of larger, 3.29 mm., very changeable, especially the anterior part. Translucent white 

 except back of middle where the color is yellow on ai'count of the ova. The alcoholic sijecimeiLs are 

 arcuate; their slender necks densely clothed witii fiat spines, which continue to the posferi(jr end. 

 On the posterior half of the body they are less den.se and arranged in transver.se series. Ova 0.021 and 

 0.014 mm. in the two principal diameters. These specimens agree with tho.se from the bonito in all 

 essential tdiaracters. The only point of difference noted i.s that the number of vitellaria does notappear 

 to be quite so definite in these a.s in the specimens from the bonito. Their arrangement, however, is 

 the same, and the nunil)er does not vary greatly fi'om that given in the original description, viz, 32. 

 See 7, pp. 297-298. pi. xi.i, figs. 8.5-90. 



Sphyrua zygasna, Iliunnurln'iul. 



KOOI). 



Fish and squid. 



XEM.\T01)ES. 



1. Spiriiiilerii jHrlinifei- i^p. i\ov. Stomach. [PI. xv, figs. 197, 198; pi. xvi, fig. 199.] 



Two nematodes, a male and a female, collected July 18, 1887, are here recorded. .Mouth terminal, 

 aperture round, two small lateral papilla- ou head. Tail in each coiled in a close spiral. Spicules in 



