298 THE AMERICAN NATURALIST. (VoL. XXXVI. 
Proboscis short and small (2 mm. long), thin-walled, bounded 
posteriorly by a double ring of fleshy papille, 9-10 in each 
ring, those of the outer circle more than twice as long as the 
inner ones. 
Esophagus short (3.5 mm.), and of small diameter (1 mm.) 
for the size of the animal, with usual chitinized lining, which 
terminates in a “trephine ” anteriorly. CEsophagus surrounded 


Fic. s.— Seven somites from the middle region of a female sexual zooid of Trypanosyllis 
ingens, viewed from the dorsal aspect. With two exceptions (d.c.) the dorsal cirri are 
broken off. The rudimentary alimentary canal (a/.c.) is indicated ; also the ova on the 
left side and in one parapod on the right. The longitudinal muscle bands (/.77.) mark the 
bases of the parapodia. In clove oil. x 19. 
by 9-10 glands, of wavy or crenulate outline, opening near the 
papille, their blind ends extending back a short distance on 
the proventriculus. 
Proventriculus also small for size of the animal, 6 mm. long, 
1.5 mm. in greatest transverse diameter, slightly club shaped, 
thickest anteriorly, tapering gradually to posterior end; two 
well-defined raphes. No coeca were detected. 
Intestine with extensive paired diverticula in every somite 
back of the proventriculus. 
Sexes distinct ; sexual products, so far as known, developed 
only in a cluster of collateral buds, growing from a definite 
proliferating region near the posterior end; probably also in 
the parental somites posterior to the budding zone. 
Length, 130 mm.; greatest transverse diameter, including 
parapodia, 6 mm.; dorso-ventral diameter, 2 mm. 
