100 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



2. T. PELLTJCiDTJS, n. sp. (Plate IX. figs. 23, 24.) 

 Female, length ^", breadth -2^"- 



External Characters. — Body white, tapering slightly anteriorly, more considerably 

 posteriori}-, Avhere it terminates in a rather long filiform extremity, with a minute pointed 

 sucker. Head truncate, provided with four short, spreading setae. Integument trans- 

 parent ; no strice visible. 



Fharyngeal camty cup-shaped. (Esopliagus about ^th of total length, having three 

 pear-shaped lobes at termination, each aljout 5-^" long. Intestine well covered with 

 light-coloured fat-particles tessellated in arrangement. Amis -^" from posterior extre- 

 mity. Vulva slightly anterior to middle of body ; genital organs very visible. 



Male, not seen, 



Hah. Mud from bottom of ponds, Palmouth. Has a habit of coiling itself into a 

 circle Avhen touched. 



3. T. LONGUS. 



Anyuillula longa, Leidy, Proceed, of Acad, of Philad. v. p. 225. 



" Body cylindrical, translucent, colourless. Mouth roxmd ; buccal cavity inverted, cam- 

 panulate ; oesophagus and intestine cylindrical, equal in diameter, the former ^s" long. 



" Female, 2 to 3 lines long ; anteriorly 3^3" broad, middle xst"- Tail narrow, acute, 

 ttt" to 7^" long from anus. 



" Hale, IJ to 2 lines long, posteriorly dilated, obtusely rounded, curved, with three 

 slight tubercular thickenings of the integument ventrally ; 2-^-5" broad, at middle -^" 

 broad. Penis a curved spiculum, -^iu" long. 



" Hah. Found in very great abundance, wriggling about the surface of soft mud, in 

 stagnant ditches in the neighbourhood of Philadelphia." 



3. MONONCHUSi, Bastian. 



Oncholaimus, Dujardin; Enophs}, Dujardin. 



Gen. Char. Fodt/ tapering to a point posteriorly. Caudal sucker small, not pointed. 

 Integument plain, or Avith longitudinal strite ; no setae; papillos present or absent 

 around the mouth. Fharyngeal caoity large, oval, having one hook or tooth-like 

 projection from the upper surface. Qisojihagus cylindrical, 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 

 active. 



Dujardin appears to me to have included in his genus Oncholaimus two distinct types, 

 which, as far as I have yet ascertained, are exclusively denizens of fresh and salt water 

 respectively. Since he has described a marine representative as his typical species, I 

 liave retained the old generic name with a more limited definition for the animals of 



' floras, single, find uyKos, a hooh. 



