94 Papers from the Marine Biological Laboratory at Tortugas. 



Dinurits rubeus sp. nov., from Lycodontis junebris. 



Fig. 149. Superficial ventral view of specimen in alcohol; length 7.5 mm. 



Fig. 150. Transverse section intestines with granular contents, single excre- 

 tory vessels, uterus, ovary, shell-gland, seminal receptacle, and 

 vitelline glands; diameter 1.18 mm. 



Plate 19. 



Dinurtis rubeus, continued, from Lycodontis junebris. 



Fig. 151. Dorsal view, balsam; length 15 mm. 



Fig. 152. Lateral view of cirrus, prostate, seminal vesicle, and metraterm ; 



reconstructed from sections. 

 Fig. 153. Transverse section showing ventral sucker, prostate, metraterm, 



and excretory vessel; breadth 1.05 mm. 

 Fig. 154. Transverse section near posterior end, showing intestines and 



dorsal excretory vessel; diameter 0.72 mm. 



Ectenurus (?) sp., immature, from Atixis thazard. 



Fig. 155. Ventral view of immature specimen in balsam; length 2 mm. 



Hapladena varia gen. et sp. nov. 



Fig. 156. Ventral view, life, details added; length 3 mm. /, ootype. From 



Tcuthis ccBTiileus. 

 Fig. 157. Ventral view of another specimen, life, details added; length 1.96 



mm. /, ootype. 



Deradena acuta gen. et sp. nov., from Tylosurus mariniis. 

 Fig. 158. Ova, life, details added; length 0.071 mm. 



Plate 20. 

 Deradena acuta, continued. 



Fig. 159. Ventral view, life, details added; length 1.166 mm. 



Deradena obtitsa gen. et sp. nov. 



Fig. 160. Ventral view of specimen froin Teuthis hepatiis, life, details added; 

 length 1.33 mm. 



Fig. 161. Ventro-lateral view of specimen from T. cceruleus, life, inemorandum 

 sketch. The specimen when stained and mounted showed no 

 more details than are given in the sketch. Length 0.98 mm. 



Deradena ovalis gen. et sp. nov. 



Fig. 162. Ventral view of specimen from Scarus sp. The anatomy was very 



poorly shown on account of the diffuse vitelline glands which 



obscvired details of structure. Length 1.75 mm. 

 Fig. 163. Ventral view, balsam; length 3.5 mm. The vitelline glands were 



much denser than represented in sketch. Figs. 163-169 from 



Scarus ccsruleus. 

 Fig. 164. Diagram of sagittal section of prostate, etc. sv' , communicating 



duct between seminal vesicle and common genital duct (c) ; z, 



point where seminal vesicle joins inetraterm. 

 Fig. 165. Saine view taken from another specimen, z, point where seminal 



vesicle joins metraterm; c, common genital duct. 

 Fig. 166. Transverse section through prostate made at x in fig. 165. 

 Fig. 167. Nearly transverse section made through x of fig. 164; e, ovum in 



common genital duct. Other reference letters as in fig. 164. 

 Fig. 168. Transverse section of body near posterior end; diameter 0.81 mm. 

 Fig. 169. From transverse section, showing active yolk-forming cells, d' , 



and different stages of the accumulation of yolk. See text for 



description. 



