Explanation of Plates. 8& 



Fig. 386. Deeply lobed ovary separated from the 2 testes, one of the latter 



lobed. 

 Fig. 38c. OvsLty, no testis present. 

 Fig. 38^. Ovary and single testis in contact; from Hceniulon sciiiriis. 



All dorsal views, and drawn to the same scale. 



Fig. 39. Filamented ovum; length of ovum 0.051 mm., length of filament 

 3 mm. 



Helicometrina nimia gen. et sp. nov. All except fig. 48 from NeomcBnis griseus. 



Fig. 40. Ventral view of stained and mounted specimen; length 2.70 mm. 

 • Excretory vessel added from another specimen. This is the usual 

 arrangement of testes, viz., 5 on right and 4 on left side. 



Fig. 41. Ventral view of a smaller specimen; length i mm. In this case there 

 are 5 testes on left and 4 on right .side. 



Fig. 42. Dorsal view of neck of another; length of neck 0.50 min. 



Fig. 43. Ventral view of neck of another; length of neck 0.74 mm. 



Fig. 44. Diagrams showing variations of testes, a, usual plan; b, c, d, varia- 

 tions noted. All ventral view. 



Fig. 45. Sagittal section through cirrus-pouch and metraterm; thickness of 

 body at this point 0.30 mm. The ejaculatory duct is shown cut 

 through in several places. 



Pl..\TE 6. 



Helicofnetrina nimia, continued. 



Fig. 46. Median portion of transverse section through cirrus-pouch and 

 metraterm. Thickness of body at this point 0.24 mm. 



Fig. 47. Ovum; length 0.043 nim- 



Fig. 48. Dorsal view of young specimen from Eupomacentriis leitcostictiis; 

 length I mm. 



Hamacreadium miitabile gen. et sp. nov. (Figs. 49 to 54 from Neomcsnis griscits.) 



Fig. 49. Dorsal view of flattened specimen, life, details added from stained 



and mounted specimen; length 2.62 mm. 

 Fig. 50. Ventral view of another specimen not much flattened; length 2.28 



mm. Specin-icns of this shape when flattened under a cover-glass 



and killed over flame may assume shape shown in preceding fig. 

 Fig. 51. Young, ventral view, in balsam; length 1.37 mm. 

 Fig. 52. From memorandum sketch made at tiine of collecting. 

 Fig. 53. Sketch of 4 specimens showing variety of form. 

 Fig. 54. Horizontal section of cirrus-pouch, /m, longitudinal muscles of 



cirrus-poxich. 



Plate 7. 

 Hamacreadium giitella gen. et sp. nov., from Neom,cenis griseus. 



Fig. 55. Ventral view, balsam; length 1.85 mm. exv' , the anastomosing 

 vessels in the head appear to be excretory vessels, although their 

 connection with the more prrminent Y-shaped excretory vessel was 

 not made out . 



Hamacreadium consiutum gen. et sp. nov., from Hcemidon plmnieri. 



Fig. 56. Ventral view, life, details added from mounted specimen; length. 



1.90 mm. 

 Fig. 56a. Ovum. 

 Fig. 57. Sagittal section of cirrtxs-pouch ; length 0.30 mm. c, ejaculatory 



duct; e, egg lying at junction of ejaculatory duct and metraterm. 

 Fig. 58. Dorsal view of cirrus-pouch; length 0.22 mm. 

 Fig. 59. Dorsal view of ovary and seminal receptacle and part of right testis ; 



length of seminal receptacle 0.08 mm. 



Leboiiria crassigiila sp. nov., from Calamus calamus. 

 Fig. 60. Ventral view, balsam; length 1.33 mm. 



Hatnacreadiiim oscitans gen. et sp. nov., from Hcemulon plumieri. 

 Fig. 61. Ventral view, life, details added; length 1.05 mm. 



