26 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
cloacal opening large, circular. Head laterally compressed, somewhat 
pointed ; cuticle with irregular prominences, which are figured. Or, in 
the words of his own diagnosis: “Corpus nigrum verrucosum, medio 
cylindricum, utrinque attenuatum depressumque, linea ventrali et dorsali, 
quarum parti caudali fasciculi pilorum insiti. Caput ellipsoideum, con- 
cavitate frontali. Extremitas caudalis trigona, apice rotundata.” This 
is a good species. 
1856. Leidy gives a much fuller description of his G. varius. He 
also describes G. robustus, n. sp., and places synonymous with it G. seta 
Miill., and G. lineatus Leidy. 
1857. The same author mentions a collection of 48 Gordit, 525 miles 
west of Fort Riley, Kansas. 
1858. Leidy notes the occurrence of an embryo of G. varius in Lum- 
briculus limosus. 
1861. Diesing regards G. platyurus and fasciatus Baird as good 
species; as also G. varius Leidy, with which he considers synonymous 
the “ G. aquaticus” of Leidy, 51. He considers Leidy’s neatus and 
robustus as doubtful synonymes of G. seta Miill. (aguatieus Linn.), Die- 
sing also describes G. swbspiralis, nu. sp.: “Corpus maris brunneum, 
femine antrorsum attenuatum, lete brunneum, nitidum, iridescens. 
Caput annulo obscure brunneo cinctum. Extremitas caudalis maris 
subspiralis crucibus furce terminalis divergentibus, incurvatis, levibus, 
plica membranacea semilunari ad basin junctis, femine obtusa, subcom- 
pressa. .. . In palude cum Siredonibus, copiose, in territorio Kansas 
(Hammond@).” 
1866. Schneider regards G. varius Leidy as a possible synonyme of 
G. gratianopolensis Charvet ( G. tricuspidatus Meissn.). 
1874, Villot regards the following as good species: G. lineatus, 
robustus, and varius of Leidy; G. subspiralis and G. chordodes of Diesing ; 
and G. chilensis Blanchard. He describes the following new species from 
America: — G. @neus, n. sp.: “Extrémité antérieure tronquée, légere- 
ment renfiée. Ouverture ano-génitale du male entourée d’un anneau 
brun. Lobes bien développés, séparés par un assez large intervalle. 
Brun bronzé. (Les jeunes individus sont d’un blanc jaunatre uniforme.) 
Epiderme divisé en losanges par un réseau de lignes saillantes oblique- 
ment croisées’’; from Cumana, Venezuela. G. reticulatus, n. sp.: ‘ Ex- 
trémité antérieure terminée en pointe aigué. Diamétre du corps allant 
en grossissant de l’extrémité antérieure & l’extrémité postérieure, qui 
se termine en point tronqtiee. Ouverture ano-génitale large. Brun 
marron. Une bande dorsale et une bande ventrale d’un brun plus 
