DESCRIPTIONS OF GENERA AND SPECIES 331 



spermatheca is so long that the organ often reaches back as far as the seventh 

 segment. The lymph-corpuscles are flat, with a pear-shaped outline, subject to slight 

 variations. This species is sexually mature in latter half of August. 



(2) Marionia ebudensis (CLAPABKDE). 



Pachydrilus ebudensis, CLAPAREDE, M6m. Soc. Phys. Gen., 1862, p. 85. 

 M. ebudensis, MICHAELSEN, Abh. Nat. Ver. Hamb., 1889, p. 29. 



Definition. Length, 12 mm.; number of segments 47. Funnel of sperm-duct very long. 

 Spermatheca hardly distinct from pouch. Ilab. Island of Skye. 



This species has been briefly characterized by CLAPAREDE, the only naturalist 

 who has investigated the worm. I am not quite sure that MICHAELSEN is fully 

 justified in placing it in the present genus, rather than in Pachydrilus. Nothing is 

 said by CLAPAREDE as to the gonads, whether they are 'uniques' or 'multiples.' 

 Indeed, one would rather infer that the testes were multiple ; for, in describing the 

 preceding species (P. verrucosus) CLAPAREDE remarks that the gonads are multiple and 

 not simple, ' comme dans les especes pre'cedentes ' (M. craasa and M. semifusca) ; it 

 would rather seem to follow, therefore, that, in the species following, the testes 

 were constructed on the plan of those of P. verrucosus ; or, at the very least, the 

 reverse could not be inferred. 



(3) Marionia semifusca (CLAPAREDE). 



Pachydrilus semifuscus, CLAPAREDE, Me'm. Soc. Phys. Gen., 1862, p. 76. 

 M. semifusca, MICHAELSEN, Abh. Nat. Ver. Hamb., 1889, p. 29. 



Definition. Length, 10 mm. Spermathecae with a duct twice as long as pouch, and with 

 a thick coating of gland-cells at pore ; spermiducal gland very large. Hab. Island 

 of Skye. 



This species has been imperfectly described by CLAPAREDE ; it is stated in this 

 description that the testes are in the tenth (eleventh), and the ovaries in the 

 twelfth (thii-teenth) segment ; there must be an error here, one would suppose. 

 The funnel of the sperm-duct is hardly twice as long as broad. The spermiducal 

 glands are so large that they occupy the whole of the coelom of their segment, and 

 the body is even bulged out in this region. The nephridia (which are figured, 



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