PARASITES OF FISHES OB' BEAUFORT, NORTH CAROLINA. 4'21 



Fig. o2. — Copulatory spines from male from Leiostomus xanthurus collected August 4, L902. Actual 

 length of spicules, chord of arc, 0.12 mm. In this lot were specimens with same type of head 

 shown in Figs. 40 and 41. The worm from which this sketch was made was larger than the 

 others, and the tail was elongated as in lng. 47. 



Fig. 53. — Anterior end of male from Leiostomus xanthurus collected July 17, 1902. Actual length of 

 worm ahout :; mm. Optical section, • 300. 



Fig. 54.— Posterior end of same. Optical section, '■ 300. 



Sporozoa. 



Fig. 55. — Piece of intestine of pompano (Trachinotus carolinus) with cysts containing sporozoa. Life; 



about natural size. 

 Fig. 56. — Sporozoa from drum [Scisenops ocellatus). Actual breadth, 0.01 mm. Life. 



Parasitic copepod. 



Fig. 57. — Specimen from gills of mullet {Mugil cephalus), lateral view. Life; actual length, 6 mm. 



c /, Modified appendages which form a clasping organ to slip over a gill tilanient of the host. 

 Fig. 58. — Sketch of specimen which had lain in water a few days. 



PLATE IX. 

 Rhinebothriwm sp., from toad-fish {Opsanus tau). 



Fig. 59. — Cluster of cysts from surface of liver. Life; enlarged about 2 diameters. 



Fio. 60. — Small cluster detached from No. 59 and flattened undercover glass. X 6. tl, Small cyst 



containing a distome (I>. valde-inflatum). The remaining cysts contain blastocysts, which in 



turn contained larva-. 

 Fig. 61. — A single cyst and blastocyst. The latter is seen to be much elongated, with an enlargement 



at the distal end. Life; X 6. 

 Fio. 62. — An enormously elongated blastocyst removed from its cyst, flattened, and showing a larva 



through the transparent wall. Life; X 50. 

 Fig. 63. — Cyst with contained blastocyst, slightly enlarged. 

 Fig. 64. — Blastocyst removed from No. 63 and compressed. The posterior # ends of two of the bothria 



of the larva are seen protruding from the anterior end. 

 Fig. 65. — Larva (scolex) removed from blastocyst. 

 Fig. 66. — Small dumb-bell-shaped blastocyst in its cyst; optical sectii f specimen mounted in 



balsam; X "0. 



PLATE X. 



Ehinebothrium sp., from Opsanus tau. 



Fig. 67. — Cyst containing blastocyst. Life; x 20. 6, Blood vessels distributed over wall of cyst; ea /». 



excretory pore. 

 Fig. 68. — Front view of head of embryo; partly diagrammatic. Life; x 50. 

 Fig. 69. — Section, nearly longitudinal through cyst, blastocyst, and larva. ■ 110. 

 Fig. 70. — Anterior end of blastocyst, showing orifice and pit into which the scolex is retracted. Sketched 



from another section of same series from which No. 69 was made. X 110. 

 Fig. 71. — Diagrammatic sketch, showing plan of arrangement of loculi. 



PLATE XI. 

 Rhinebothrium sp. from Opsanus tau. 



Fig. 72. — Transverse section of cyst with blastocyst and larva. X 110. 



FlG. 73. — Portion of walls of cyst and blastocyst. ■ 525. 



Fig. 74. — Transverse section of wall of blastocyst. X 525. 



Fig. 75. — Part of viscera of pipe-fish (Siphostoma fimcum) with cysts containing larva? of Rhinebothrium 



sp., same species as the one found in the toad-fish. Life; X 3. <j b, gall-bladder; /', intestine; 



/, liver; 8, stomach. 



