The annals and magazine of natural history : zoology, botany, and geology . which the cercaria shows any affinity. More detaileddifferentiation seems at present out of the question. Thesmall excretory vesicle without conspicuous lateral stems and Larval Trematodes. 243 the absence of oesophagus (althougli this may be due to con-traction) are strong evidences in favour of Fdlodistomumfellis (Olss.) being the adult; the only coatra-indication towhich is the fact that Anarrhic/ias lupus, the only knownhost of Fellodistomurn fellisj is not common in the neighbour-hood of Millport. Cercaria concava
The annals and magazine of natural history : zoology, botany, and geology . which the cercaria shows any affinity. More detaileddifferentiation seems at present out of the question. Thesmall excretory vesicle without conspicuous lateral stems and Larval Trematodes. 243 the absence of oesophagus (althougli this may be due to con-traction) are strong evidences in favour of Fdlodistomumfellis (Olss.) being the adult; the only coatra-indication towhich is the fact that Anarrhic/ias lupus, the only knownhost of Fellodistomurn fellisj is not common in the neighbour-hood of Millport. Cercaria concava, nov. In a young plaice {Pleuronectes platessa), about 41 incheslong, a small round cyst was found embedded under the diameter was 17 mm. and it was very thin-walled, so thatthe cercaria was easily liberated. Its resemblance to Crypto^cotyle concava (Orepl.) is even at first sight very shape is flattened, considerably broader towards theposterior end than towards the anterior end. The length is•48 mm. and the breadth at the widest part 22 mm. The. Cercaria concava. small round oral sucker has a diameter of 06 mm., the pre-pharynx is 03 mm. long, the pharynx 04 mm., and theoesophagus 04 mm. The diverticula have the shapecharacteristic of the adult Cryptocotyle, bending in towardsthe middle line in the vicinity of the genital sucker, thencurving out, and finally turning in at their termination toapproach each other. The excretory vesicle is clearly seenand consists of two fairly straight lateral tubes, beginningnear the prepharynx and running into a simple, rather wideterminal sac at the posterior end of the body. The genitalsucker is quite distinct, situated about the middle of the this structure is not a ventral sucker in the true sense 24i Dr. W. Nlcoll and Mr. W. Small on of the term is evidenced by the fact that althougli theaperture is sharply enough defined, the sucker itself does nothave the well-marked outline usually associated with th
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Keywords: ., bookcentury1800, bookdec, booksubjectnaturalhistory, bookyear1838
