ENTOZOA. 189 



only to some species from Mammalia, which have a flat tongue-like form, 

 and especially to that found in the lungs of the hare by FR<ELICH, and not 

 since re-discovered, Linguatula serrata. See J. A. FR(ELICH, Beschreibung 

 einiger neuer Eingeiveidewiirmer, Naturforscher xxiv. 1789. s. 148 150. 

 Tab. IV. f. 14, 15. 



[T. D. SCHUBERT (Letter to V. SIEBOLD Zeitschr.f. wissenschaftl. zool. iv. 

 1852. s. 117, 1 1 8) concludes from his observations on the development of 

 Pentastoma in the egg that it ought to be placed amongst the Acarina or 

 Lemceacea. The embryo has two booklets at the anterior part, or head, 

 two pairs of lateral appendages or feet, each foot furnished with two claws, 

 and a tail as long as the rest of the body, into which the intestinal canal 

 is continued.] 



Phalanx II. Strongylo'idea nob. Mouth terminal, or sub-ter- 

 minal anterior, not surrounded with retractile hooks. Body round, 

 elongate, elastic. 



a) Mouth anterior, not terminal. 

 Rictularia FECELICH, DUJARD. 



Comp. FRCELICH Naturforscher xxix. 1802. s. 9. Tab. I. f. i 3; Du- 

 JARDIN Helminth, p. 280. 



Ophwstoma RlJD. 



Genera Dochmius, Dacnites DUJ. 



b) Mouth anterior, terminal. 



Cucuttanus MUELL. Body elongate, posteriorly attenuated. 

 Head broad, with bivalve apparatus for manducation. Mouth a 

 longitudinal, vertical fissure. 



Sp. Cucullanus elegans ZEDER, RUD., Entoz. Hist. nat. Tab. in. figs, i 3, 

 BREMSER Icon. Helm. Tab. II. figs. 10 14 ; in the intestinal canal, the 

 stomach and the pyloric appendages of the perch and other fresh-water 

 fishes ; almost all the other species of this genus live likewise in the intes- 

 tinal canal of fishes. 



Heterocheilus DIESING. 



Strongylus MUELL. Body round, sometimes filiform, very long, 

 acuminated anteriorly. Mouth orbicular or triangular. Apex of 

 the tail terminated in the male by a bursa emitting a double or 

 single penis. 



Sp. Slrongylus yigas RUD. Entozoor. Hist. nat. Tab. n. figs, i 4; BREMSER 

 Ueb. leb. Wurm. Tab. 3 5, in the kidneys of man and of different mam- 

 malia* ; this worm can attain the length of more than a foot, the female of 

 three feet. The colour is red, as in many other species of this genus. 



