10 THE PiOTIFKKA. 



fspeciiaens agreed accurately witli eacli othei', as descriljed above. In tlie open water 

 they Bwain Kwiflly ; and it was difficult to confine tliem even with the compressor; for 

 they soon managed, by contraction and elongation, to wriggle themselves out of the 

 field of view. The Naia was from a pool at Walthamstow. lixamining another Nwis 

 from the same phial, 1 found a single Alberlia in the i)itestine; in another, an egg of the 

 parasite was within the intestine, attached to a pellet of fii^cal matter, which pushed it 

 along. The opacity of the bowel prevented my seeing wliether any matured parasites 

 were present or not in this ease. — P.H.G.] 



Length, ,,';„inch; diameter, jj,) to ^J„„ inch. Habitat. Walthamstow (P. H.G.) : 

 entozoic. 



A. naJdis, Bousfield, sp. nov. 

 (PI. XVII. fig. 14.) 



[HP. CH. Body vwderaiely long, the cervical and pectoral j'arts the thickest, 

 diminishing to the hind 'part ; toe minute, soft, papiUiform ; integ'ument sliglttly con- 

 slricted in the hinder half. 



This species was discovered by Mr. Edward C. Bousdeld, who has kindly communi- 

 cated to me his own careful drawings and descriptive MS. notes. He has "several times 

 observed it in situ, in Na'is harbata, living free within the cavity of the stomach of its 

 host." 



" Body cylindrical, soft, hyaline, vermicular, extremely flexible and telescopic, espe- 

 cially the hinder part. Anterior extremity truncate. Trochal disc small, oblique, on 

 dorsal aspect of body. [One drawing shows that it is invertile, the cilia being depicted 

 far down the buccal funnel. — P.H.G.] Jaws very minute, protrusile, snapping. Ali- 

 mentary canal conical, extending through the body, opening at the junction of the last 

 two Hcgnicnts. Gastric gland semi-ovoid. Ovary straight, slender, cylindro-conical ; 

 the ova developed serially. A minute contractile vesicle. 



"Caudal appendage [= foot, P.II.G.) papiUiform, composed of two joints [of which 

 the terminal is] soft, resembling in its action the fi)iger of an elephant's trunk." 



"Habitat. Vicinity of London. Anterior portion of stomach of A'^rfi.v, in which it 

 moves fi-eely. i'lgg alioul one-tliird of length of parent's body. Length, jj^, inch."' 

 — P.II.G. 1 



Genus TAPHEOCAMPA, Gossc. 



[OI'iN. (!!!. Body fii.siform or cylindrical, annulose, furnished with, two furcate toes; 

 tro]>h\ fore i J IK Ic , KiUdiirij cilia wanting or very limited. 



T. ANNULOSA, Gosse. 

 (PI. XVII. fig. 12.) 



'J'u})l(iiir(i)iiiiii (iiinulDsa . . , GosHe, Ann. Nat. Ilisl. 2 Her. IHrd, ]t. \'.\'.), 



SP. <'ll. Body cylindrical, short ami thick, marked, Uuuiigliuut villi distinct articu- 

 lations ; brain opaque; alimentary canal simple, wide, cylindrical; terminal fork 

 think, conical, acute. 



This animal is very larva-like; tlie body consists of many well-marltiid ri)igs or 

 segments wliicli are set within tlie clear cylindrical integunu^iit, ii,))pai'(>iitly toiicliing 

 this only at the points. Eacli of tliese, if viewed through the lujigitudiiial line, would 

 be of a sub-sijuari^ outline, witli four projecting angles, as seen at fig. 126. In general 

 no vortices are seen, nor any trace of vibratile cilia, so that 1 long concluded 



' Tluis the Ihrcc i-econlfjil species (lU'fer notably in their respective dimensious : -.\. icniiiciihis 

 hvinti »'u inch to J„ ineli (fuj.) ; A. iiiiiuaor, „I,j in. (P.II.G.) ; A. naidis, ;,J„ in. (Boubtiold). 



