100 MR. H. CHARLTON BASTIAN’S MONOGRAPH 
2. T. rELLUCIDUS, n.sp. (Plate IX. figs. 23, 24.) 
Female, length $^, breadth 335”. 
External Characters.—Body white, tapering slightly anteriorly, more considerably 
posteriorly, where it terminates ina rather long filiform extremity, with a minute pointed 
sucker. Head truncate, provided with four short, spreading setæ. Integument trans. 
parent; no striæ visible. 
Pharyngeal cavity cup-shaped. (Esophagus about 3th of total length, having three 
pear-shaped lobes at termination, each about z45” long. Intestine well covered with 
light-coloured fat-particles tessellated in arrangement. Anus 4” from posterior extre. 
mity. Vulva slightly anterior to middle of body ; genital organs very visible, 
Male, not seen, 
Hab. Mud from bottom of ponds, Falmouth. Has a habit of coiling itself into a 
circle when touched. 
3. T. LONGUS. 
Anguillula longa, Leidy, Proceed. of Acad. of Philad. v. p. 225. 
“ Body cylindrical, translucent, colourless. Mouth round; buccal cavity inverted, cam- 
panulate ; œsophagus and intestine cylindrical, equal in diameter, the former 3." long. 
“ Female, 2 to 3 lines long; anteriorly 31,” broad, middle 385 . Tail narrow, acute, 
ili to 74%” long from anus. 
“ Male, 14 to 2 lines long, posteriorly dilated, obtusely rounded, curved, with three 
slight tubercular thickenings of the integument ventrally; 41." broad, at middle ih 
broad. Penis a curved spiculum, 580 long. | 
" Hab. Found in very great abundance, wriggling about the surface of soft mud, in 
stagnant ditches in the neighbourhood of Philadelphia.” 
3. MONONCHUS!, Bastian. 
Oncholaimus, Dujardin ; Enoplus ?, Dujardin. 
GEN. Cuar. Body tapering to a point posteriorly. Caudal sucker small, not pointed. 
Integument plain, or with longitudinal striæ: no setæ; papillæ present or absent 
around the mouth. Pharyngeal cavity large, oval, having one hook or tooth-like 
projection from the upper surface. (Esophagus eylindrical, canal indicated by three 
bright lines; transverse muscular fibres not distinct. Intestine well covered 
with hepatic cells; fat-particles light-coloured, having tessellated arrangement. 
Vulva about middle of body. Uterus bifid, segments symmetrical. Spicules —? 
Lateral canals very indistinct, having a slightly cellular appearance. Movements 
ive. 
Dujardin appears to me to haye included in his genus Oncholaimus two distinct types 
which, - far as 1 have yet ascertained, are exclusively denizens of fresh and salt water 
aoo Since he has described a marine representative as his typical species, I 
ave retained the old generic name with a more limited definition for the animals of 
1 14 y 
povos, single, end üyxos, a hook. 
