XVI BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



403. Tetrameres coccinea. Female, a, Total; b, anterior extremity; c, ovejec- 



tor ; d, seminal receptacle at junction of uterus and oviduct. After 

 Seurat, 1914. 



404. Tetrameres cochlcariae. Ovejector. After Travassos, 1919. 



405. Tetrameres confusa. a, Female : b, male tail. After Travassos, 1919. 



406. Tetrameres dubia. Male. After Travassos, 1919. 



407. Tetrameres fissispina. a and b, Head end of male, lateral view (a), dorsal 



view (ft), showing the two bifid cephalic spines and the simple body 

 spines ; c, head end of female, dorsal view. After Seurat, 1920. 



408. Tetrameres flssispina. Head and tail of male. After Travassos, 1919. 



409. Tetrameres fissispina, a, Ovejector; b, copulatory receptaculum ; c, fe- 



male genital system. After Seurat, 1914. d, Tail of larva, ventral 

 view. After Seurat, 1919. 



410. Tetrameres gigas. Anterior and posterior ends of male. After Travassos, 



1919. 



411. Tetrameres gynaecophila. a, Head of female ; b, tail of male. After 



Seurat, 1915. 



412. Tetrameres micropenis, a, Tail of male; b, ovejector, showing striated 



appearance of musculature. After Travassos, 1919. 



413. Tetrameres nouveli. a, Female ; b, ovejector ; e, seminal receptacle and 



oviduct ; d, egg with filaments ; e, head end of male ; f, tail end of male. 

 (500ft scale for a to c; 100/a scale for d to /.) After Seurat, 1914. 



414. Tetrameres tetrica. Male. After Travassos, 1919. 



415. Microtetramercs cruzi. a. Female ; b, male. After Travassos, 1914. 



416. Microtetramercs eontorta. a and b, Males; c, youngest female, showing 



tendency to coil ; d and e, mature females ; f, tail of female ; g, ova, 

 unilateral bib represented on one ; h, mature female, showing course, 

 of esophagus and intestine ; i, half grown female, coiled in one plane 

 only. After Weidman, 1913. ;', Wax reconstruction of female. After 

 Weidman, 1923. 



417. Microtetramercs helix, a, Male tail ; b and e, females ; d, female tail. 



Original. 



418. Microtetramercs inermis. a, Male; b, ventral view and c, lateral view of 



tail of same : d, head end of same. (Scale applies to b, c, and d.) After 

 Seurat, 1913. 



419. Microtetramercs incrmte. Female, a, Adult ; b, adult examined perpen- 



dicularly to determine manner of coiling ; c, immature ; d, anterior end. 

 After Seurat, 1913. 



420. Microtetra meres inermis. a, Ovejector. After Seurat, 1914. b, Part of 



same; c, ovary, oviduct, and initial region of uterus; d, vulva; e and f, 

 ha (cbing of eggs. After Seurat, 1913. 



421. Microtetramercs minima. Male. After Travassos, 1914. 



422. Microtetramercs pusilla. Male. After Travassos, 1919. 



423. Microtetramercs spiralis. Head and tail of male. After Seurat, 1915. 



424. Ancijracanthopsis bihamata. a and b, Head end; c and d, male tail; 



e, spicule: f, female tail; g, vulva. After Mueller, 1897. 



425. Gtiatliostoma accipitri. a, General appearance ; b, hooks of cephalic 



region. After Skrjaliin. 1916. 



426. Qnathostoma pelecani. a, General appearance; 6, glandular apparatus : 



c, vulva. After Chatin, 1874. 



427. EustrongiiUdes iul>ifc.r. a. Male tail; b, head end; c, female tail. After 



Jaegerskiold, 1909. 



