94 Papers from the Marine Biological Laboratory at Tortugas. 



Dinurus rubeus sp. now, from Lycodontis funebris. 



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. 



Din itrus rubeus, continued, from Lycodontis funebris. 



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 Auxis 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 



Teuthis cceruleus. 

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



mm. /, ootype. 



Deradcna acuta gen. et sp. nov., from Tylosurus marinus. 

 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 obtnsa genr et sp. nov. 



Fig. 160. Ventral view of specimen from Teuthis hepatus, life, details added; 

 length 1.33 mm. 



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

 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 



obscured 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 cceruleus. 

 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 metraterm. 

 Fig. 165. Same 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. 



