30 
ERVISIA GHILES-A DE HISTORIA NATURAL 
smaller, simple annuli lie between the anus and the caudal 
sucker. Anus minute, dorsal. 
Caudal sucker very large, exceeding greatest width of body, 
thin, widely free and flaring and without visible markings. 
Integument smooth, without papillae. Pulsating lateral ve- 
sicles absent. Owing to the imperfect preservation of the spe- 
cimens and the absence of external metameric characters the 
details of segmentation are unknown. Typical segments are 
primarily triannulale, each annulus being again faintly subdi- 
vided into two, The posterior intestinal caeca are long and slen- 
der and only slightly united or quite free at the posterior 
end. 
Color in alcohol nearly uniform brown above, paler below. 
Measurements of type: length — ^14 mm., maximum width — 
1.7 mm., diameter of oral sucker — 1 mm., diameter of caudal 
sucker — 2.3 mm. Type N.« 10311, U.S. National Museum. A 
second specimen was dissected but owing to excessive contrac- 
tion yielded little of value. Collected by Prof. G. E. Porter at 
Valparaiso, June 1906, on Poriclithys porosus. 
Philadelphia, December, 1909. 
