Explanation of Plates. 95 



Plate 21. 

 Mesolecitha linearis gen. et sp. nov., from Teuthis ccertdeus. 



Fig. 170. Ventro-lateral view, life, details added; length 4.55 mm. 



Fig. 171. Nearly horizontal view of ovary, shell-gland, filiform seminal 



receptacle, etc., made up from 3 or 4 horizontal sections. 

 Fig. 172. Sagittal section of cirrus, seminal vesicle, and metraterm, made up 



from 3 or 4 sections. 



Barisomum erubesccns gen. et sp. nov., from Pomacanthus arciiatus. 



Figs, i 73-1 73c. Sketches from life showing different specimens in various 

 positions. Intestines dark brown or black, reproductive organs 

 generally white, ground-color pink. 

 Ventral view, lateral edges rolled under; length 2.5 mm. 

 Another, same view; length 3.25 mm. 

 Lateral view; length 3.25 mm. 

 Dorsal view; length 3.50 mm. 



Posterior end, ventral view; diameter 1.5 mm. The end has been 

 cut, the lateral edges unrolled and spread apart. At x the intes- 

 tine appears to be cut ; if this is so the intestinal rami anasto- 

 mosed at the posterior end. 

 Fig. 175. Transverse section, showing prostate, seminal vesicle, etc.; diame- 

 ter 1.26 mm. 

 Fig. 176. Cirrus-pouch, prostate, etc., ventral view, edge turned under. 

 Fig. 177. Transverse section near posterior end, showing anastomosis of 

 intestinal rami (this seems to be exceptional), ventral excretory 

 pore and excretory vessel. Diameter 0.63 mm. 



Plate 22. 



Barisomum erubescens, continued. 



Fig. 178. Transverse section showing intestinal diverticula, strong transverse 

 muscles, duct of prostate (no prostatic cells shown in this sec- 

 tion), metraterm, and cirrus. Thickness of body at this point 

 0.22 mm. m', cells surrounding metraterm. 



Fig. 179. Transverse section showing duct of prostate, vas deferens, uterus, 

 transverse muscles, etc. Thickness of body here 0.25 mm. it', 

 uterus with ova cut transversely. 



Fig. 180. Transverse section showing fascicles of strong transverse muscles; 

 thickness 0.19 mm. 



Fig. 181. Transverse section of cirrus-pouch; diameter 0.14 mm. 



Fig. 182. Ovum with filaments. 



Fig. 182a. Ovum Avithout filaments, more highly magnified; length of ovum 

 0.037 mm.; length of filament 0.30 mm. 



Fig. 183. Dorsal view, life. The intestines, from the bifurcation to the level 

 of the point marked x, were pink with clear granules ; beyond 

 this point they were filled with dark-brown or black granular 

 contents. Length 2.6 mm. 



Himasoinum candidulum gen. et sp. nov., from Pomacanthus arcuatns. 



Fig. 184. Ventral view, fife, details added, folds of uterus diagrammatic; 



length 5 mm. k, muscular ridge. 

 Fig. 184a. Ventral view of head; diameter 0.32 mm. 



Plate 23. 



Himasommn candiditlum, continued. 



Fig. 185. Ventral view^ of head of a different specimen from that sketched in 



fig. 1840; diameter 0.50 mm. 

 Fig. 186. Dorsal view of head with definite muscular ridge; diameter 0.43 mm. 

 Fig. 187. Dorsal view of head of another specimen with faint muscular ridge ; 



diameter 0.28 mm. 



