88 Papers from the Marine Biological Laboratory at Tortugas. 



Cymatocarpus tindulatus Looss. 



Fig. 15. Dorsal view of flattened specimen, life; length 3.57 mm. Ova in 

 folds of uterus on right side and in posterior folds of left side dark 

 brown, those in other folds of left side yellow. Metraterm sur- 

 rounded by gland-cells resembling prostate gland. 



Fig. 16. Ventral view, life, showing details of the genitalia. 



Fig. 17. Transverse section of cirrus-bulb, showing prostate cells, part of 

 seminal vesicle, and secretion in wall of prostatic duct; diameter 

 0.30 mm. 



Fig. 18. Transverse section of neck showing esophagus and excretory vessel; 

 diamieter 0.86 mm. 



Fig. 19. Transverse section just behind the bifurcation of the intestine; 

 diameter 0.87 mm. 



Plate 3. 

 Cymatocarpus iindulattts, continued. 



Fig. 20. Ova; length 0.024 mm. 



Fig. 21. Excretory pore and sttrrounding glandular cells; diameter of pore 

 0.04 mm. 



Fig. 22. Portion of transverse section of neck, showing yolk-forming cells 

 and accumulating yolk in central parenchyma. Thickness of 

 worm at this point 0.15 mm. y, accumulating j^olk. 



Orchidasma ampliiorchis (Braun) Looss. 



Ventral view of specimen mounted in balsam; length 2.3 mm. 

 Details of genitalia, dorsal view ; breadth of body at level of anterior 



testis 0.63 mm. 

 Ova; diameter 0.030 mm. 

 Spines froin cirrus; length 0,05 mm. 

 Spines from metraterm; length 0.040 mm. 

 Spines from distal end of metraterm; length 0.05 mm. 



Trematodes from Fish. 

 Helicometra torta sp. nov., from Epinephelus striatus. 



Fig. 29. Ventral view, life, flattened; length 4 mm. 



Pl.'^te 4. 

 Helicometra torta, continued. 



Fig. 30. Dorsal view of another specimen, not much flattened ; length 1.57 mm. 



Fig. 31. Surface view, life, ventral; length 2 mm. 



Fig. 32. Details of ovary etc., of another specimen, life, ventral view; diam- 

 eter of posterior testis 0.27 mm. k, ootype. 



Fig. t^;^. Portions of ovary, shell-gland and yolk-reservoir, with ootype, from 

 section; diameter of ootype 0.03 mm. e' , germ cell entering ootype. 



Helicometra execta sp. nov. 



Fig. 34. Dorsal view, life, details added from mounted specimen; length. 

 1.90 mm. 



This and the following figures, with the exception of 38^, 

 from HcEtniilon plnm-ieri. 



Fig. 35. Ventral view of another specimen; length 1.50 mm. 

 Fig. 36. Cirrus-pouch and metraterm from longitudinal section. n, cells 

 surrounding genital aperture. 



Plate 5. 

 Helicometra execta, continued. 



Fig. 37. Transverse section of cirrus-pouch and metraterm at anterior border 



of ventral sucker. 

 Fig. 38. Ovary and testes from different specimens. 

 Fig. 38a. Ovary in contact with single testis, latter not lobed. 



