80 TRANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



ai about (he middle, and join to form a large yolk reservoir. 

 This also is shown in Nicoll's figure, but the reservoir 

 does not appear to have been as large in his specimens as 

 in mine. The ovary and receptaeulum seminis lie on the 

 right side of the body in front of the testes. Xo trace of the 

 uterus could be made out, but the specimen contains one 

 egg lying apparently near the yolk reservoir. The 

 diameters of this are 0"79 by 047 mm., almost exactly the 

 sizes given by Nicoll for his type specimens. 



(2) Prosthecobothrium dujardinii, (van Beneden). ::: 



Habitat: large intestine of Raja maculata, Cardigan 

 Bay. 



This cestode is apparently very rare in Irish Sea 

 fishes, and so far I have only seen one specimen. It is 

 desirable to draw attention to some points in the anatomy 

 of the species which do not seem to conform to the diagnosis 

 of the genus. The species was described by van Beneden 

 as Acanthobothrium dujardinii but was made the type of a 

 new genus by Diesingt. The characters of the genus 

 Prosthecobothrium thus formed are : Seolex with four un- 

 divided bothridia, each having a suctorial appendage at 

 its posterior extremity; no accessory suckers on the 

 anterior margins of the bothridia; two double hooks on 

 each of the latter. 



The measurements of the worm are : — 



Length of strobila, about 10 mm. 



No. of proglottides, about (J. 



Length of scolex, 0'39 mm. 



Length of hooks, OT-S mm. 



Length of longest proglottis, 212 mm 



Breadth of ,, ,, 0*5 mm. 



* " Faune littorale de Bclgique : les Vers Cestoides." Nouv. Mem. 

 Acad. Roy. Belgique, T. XXV, p. 133. PI. X, 1850. 



t " Revision der Cephalocotyleen." Sitznngsber. Acad. Wiss. Wien; 

 Math.-Nat. cl. ; Bd. 48, 49, 1864. 



