A PARASITE OF TIIE TIGER SHARK. 
555 
Plate III. 
Fig. 16, Side view of scolex, from life, much enlarged. 
Fig. 17. Transverse section of neck and pseudoscolex of small specimen, X about 
50 ; l, longitudinal aquiferous vessels ; l\ lateral branches of same iu pseu- 
doscolex ; a, cervical outgrowth of pseudoscolex. 
Fig. 18. Transverse section a little below middle of neck, X 200 -{-; v, transverse 
muscle fibers; other letters as in previous figures. 
Fig. 19. Section made nearly longitudinally through anterior part of body, pseudo- 
scolex and scolex of small specimen more nearly central than fig. 24. 
a, folds of pseudoscolex; b, anterior, b' , posterior loculus; X about 30. 
Fig. 20. Transverse section of anterior part of body immediately back of pseudo- 
scolex of small specimen, X about 32. In section from which this sketch 
was made pieces of the nseudoscolex folds surrounded the section of the 
body but were not attached to it; c, epidermis and cuticle; d, d , points 
where the longitudinal muscle layer m touches the cuticle. In the sec- 
tions preceding this the longitudinal muscle fibers entered the cervical 
outgrowth of the pseudoscolex at these places; s. c., subcuticular granulo- 
fibrous layer; m, longitudinal and c. m., circular muscle layer; l, larger 
inner, l', smaller outer aquiferous vessel; n. c., nerve vessels lying near 
marginal extremities of central core. 
All the figures on plate in with the exception of fig. 16, made from picro- 
sulphuric preparations stained with Beale’s aminoniacal carmine. 
Plate IV. 
# 
Fig. 21. Details of Fig. 22: Transverse section immediately behind pseudoscolex 
of small specimen; c, epidermis; c', cutis; s. c., cuticular fibro-granu- 
lar layer ; m., longitudinal muscles; l, larger aquiferous vessel, section 
through an abrupt fold of vessel; l', smaller aquiferous vessel; c. in., 
circular muscles; n. c., nerve vessels. X about 225. 
Fig. 21a. Details of epidermis: e, outer; e', inner layer of epidermis; c, cutis; s. c., 
subcuticular layer. 
Fig. 22. Transverse section approacliiug posterior of pseudoscolex ; small specimen, 
X about 50 ; m', muscle fibers of the pseudoscolex continuous with the 
longitudinal muscles of the body. 
Fig. 23. Longitudinal marginal section from middle of small specimen through 
larger aquiferous vessel. X 54. The longitudinal fibers of the subcu- 
taneous layer are here visible. 
Fig. 24. Longitudinal section a little inclined to the lateral face of the strobilo 
through scolex and pseudoscolex; X about 30; a , cervical outgrowth 
of pseudoscolex near base ; b, same near scolex ; l', aquiferous vessel ; 
c, epidermis. 
Fig. 23. From corrosive sublimate preparation stained in borax carmine; 
others, picro-sulph., Beale’s carmine. 
