96 Papers from the Marine Biological Laboratory at Tortugas. 



Fig. i 88. Dorsal view of esophagus, intestines, and excretory vessel. The dots, 

 tm, represent fascicles of transverse muscles seen in section. 



Fig. 189. Cirrus-pouch and metraterm, ventral view; diameter 0.90 mm. 

 k, filaments of ova protruding from genital aperture. The ova 

 are drawn on a slightly larger scale than remainder of sketch. 



Fig. 190. Ventral view of posterior end, uterus diagrammatic; diameter 

 0.52 mm. The edges were turned under, but this was disregarded 

 in the sketch to avoid confusion. 



Fig. 191. Horizontal section of the head showing arrangement of muscles; 

 diameter 0.20 mm. 



Fig. 192. Plan of musculature of body-wall. There is an outer transverse 

 (circular) layer, under this a longitudinal layer, and under this 

 again 2 diagonal layers. The diagonal layers are of coarser fibers 

 than the 2 outer layers. 



Fig. 193. Section of cirrus and metraterm, from horizontal section of body, 

 but nearly tangential of the marginal region at this point. Diam- 

 eter of cirrus-pouch 0.05 mm. 



Fig. 194. Tangential section of cirrus and prostate, tube of latter with pros- 

 tatic secretion in elongated masses on walls. Diameter 0.11 mm. 



Fig. 195. Transverse section of body in front of reproductive aperture, 

 showing intestines, excretory vessels, and fascicles of transverse 

 muscle fibers. Breadth 0.30 mm. 



Fig. 196. Ova, apparently without filaments, from posterior end of body. 

 Length 0.037 mm. 



Plate 24. 



Himasomum candidulum, continued. 



Fig. 197. Ovum with filaments, from folds of uterus in front of ovary. 

 Fig. 197a. Ovum greatly enlarged; length of ovum 0.037, of filament 0.42 mm. 



Cleptodiscus reticulatus gen. et sp. nov.; from Pomacanthits arciiatus. 



Fig. 198. Dorsal view, balsam, showing characteristic areolar structure; 

 length 1.75 mm. s, posterior sucker showing from under side 



Fig. 199. Section of esophagus, nearly transverse; diameter 0.04 mm. n, 

 cells surrounding esophagus. 



Fig. 200. Sagittal section through oral sucker and esophagus; diameter of 

 head at base of oral sucker 0.20 mm. dh, dorsal, and vh ventral 

 granular masses; a', cells in oral sucker; n, cells surrounding 

 esophagus. 



Fig. 201. Ventral view, life, details added; length 4 mm. r,r, rudimentary 

 suckers; 5, posterior sucker. 



Fig. 202. Horizontal view of head showing rudimentary suckers r; n, cells 

 surrounding esophagus. Diameter at level of rudimentary suck- 

 ers 0.30 mm. 



Fig. 203. Sagittal section through genital aperture showing cirrus-pouch, 

 metraterm, vas deferens, intestine, portion of anterior testis, and 

 characteristic areolar parenchyma, i, intestine with granular 

 contents; n, cells surrounding genital aperture. Thickness of 

 body at genital aperture 0.40 mm. 



Fig. 204. Transverse section showing cirrus-pouch, metraterm, cells surround- 

 ing genital aperture, intestine, and excretory vessels. Diameter 

 0.45 mm. 



Stegopa globosa gen. et sp. nov., from Neomczms griseus. 



Fig. 205. Ventral view, life, details added; length 0.56 mm. 



Fig. 206. Dorsal view of same. 



Fig. 207. Ventral view of anterior end, life. Diameter of oral sucker 0.1 1 mm. 



