NOTES ON THE 

 SPECIES OF ECHINORHYNCHUS 



PARASITIC IN THE GETACEA 



BY 



ARTHUR E. SHIPLEY, M. A. 



Fellow and Tutor of Christ's Collège Cambridge, 

 Lecturer on the Advanced Morphology of tbe Invertebrata in the University. 



In 1886 Professor R. Gollett of Christiania described two species 

 of Ecfiinorhynckus infesting the intestines of Rudolphi's Rorqual, 

 Balamoptera borealis Lesson (1). One of thèse he thought belonged to 

 the species E. porrigens Rud. though as he took away from the 

 Whale but one perfect spécimen and this had its head retracted he 

 could not be quite certain. The other he took to be new and named 

 E. ruber. Collett's spécimens of the latter were in length from 10 mm 

 up to 25 mm in full grown spécimens. Most of them were white in 

 colour but the fully adult examples were an intense red as if impreg- 

 nated with the red pigment of the Crustaceans which form the 

 food of the host (fig. 1). Maies and females were mingled together 

 apparently in about equal numbers, the maies, though not difïering 

 in other respects, are easily recognized by two folds which sur- 

 rounded the génital orifice. 



0. von Linstow (2) suggests that the E. ruber of Collett is équiva- 

 lent to the E. turbinella of Diesing (3) and I think that any one who 

 will compare the figures given by the latter author (4) (fig. 2) with 

 the wood-cut of Collett (p. 258) will corne to the same conclusion. 



Collett was himself inclined to regard his species as allied to the 

 E. bremcollis of Malm, but he states that it dilïers in several parti- 

 culars. The one which he mentions is presumably the most impor- 

 tant, « the neck is reduced to a short and quite thin pedicle, from 



(1) Proceed. Zool. Soc. London, 1886, p. 258. 



(2) 0. von Linstow, Compendium der Helminthologie. Nachtrag. Hannover, 

 in-8", 1896. 



(3) Diesing, Systema Helminthum. Vindobonae, 1831; cf. II, p. 54; and 

 Denkschr. der Akad. der Wiss. in Wien, XI, 1856, p. 288. 



(4) Taf. III, flg. 19, 20 and 21. 



