4 PBOCEEDINGS OF THE NATIONAL. MUSEUM. vol.65. 



Female. — Anus 86[jl before the end of the short conical, conspicu- 

 ously annulate tail (fig. 9) . Vulva 32[j. before anus. Vagina strongly 

 muscular, 180[jl long. Uteri two, convergent, running parallel and 

 forward nearly to excretory pore. 



Host. — Testxido denticidata. 



Location. — In intestine. 



Locality. — Brazil, Para. 



Tyins.—^^. S. N. M., Helm. Coll. No. 25445 in glycerine. Para- 

 types, Cat. No. 25393 (part in glycerine, part in 70 per cent alcohol) ; 

 also in the British Museum. 



Superfamily ASCAROIDEA. 



Family ASCARIDAE. 

 Genus ANGUSTICAECUM Baylis. 



ANGUSTICAECUM BREVISPICULUM, new species. 



Speciiic characters. — Angusticaecum; length up to 120 mm., 

 greatest diameter 3 mm. Head (figs. 10, 11) 0.5 mm. in diameter, 

 lips twice as broad at base as high, somewhat rounded. Cuticle 

 transversely^ striate at intervals of Gji.. Intestinal caecum slightly 

 more than half length of and about one-fourth as thick as the 

 esophagus. Esophagus one fifteenth of the total length. Posterior 

 end of worm mucronate. Anus subterminal. 



Male. — Spicules (fig. 12) subequal in length (1.4 and 1.3 mm.), 

 one much thinner (28ix) than the other (85[jl). Opening of cloaca 

 about 150tJi. in front of the posterior extremity. Behind the cloaca 

 there are five pairs of papillae and two single papilliform structures, 

 these last probably glandular. Directly in front of the cloaca there 

 is a transverse sinuous line of five papillae and, extending anteriorly 

 from the second and fourth papillae of this row are two files of 

 papillae, sixteen in each. 



Female. — Vulva a transverse slit just before the middle. Vagina 

 about 4 mm. long, uteri double and convergent, reaching nearly to 

 posterior extremity of worm, ovaries intricately coiled about the 

 uteri throughout their length. Anus about 1 mm. in front of the 

 tip of the tail. Eggs 114-142 by 71-85^ with thick smooth shell. 



Flo St. — Tesetudo denticulata. 



L.ocation. — Intestine. 



Locality. — Brazil, Para. 



Types.— {]. S. N. M.. Helm. Coll. No. 25406 in 70 per cent alco- 

 hol. Paratj'pes, Cat. No. 25407, in 70 per cent alcohol. 



Angusticaecum, holopterum (Rudolphi) was originally described 

 as a parasite of the green sea turtle, Chelonia mydas^ and as having 



