W. A. Harding 
137 
That this genus is represented in British waters is beyond dispute ; 
we are unable however to state positively to which species of Trachelo- 
bdella the examples recorded from our coasts are to be referred. 
Dalyell (1853) describes two marine leeches in addition to Pontobdella. 
Of one of these, which he calls Hirudo campamdata, he had but two 
specimens and his description and drawings are altogether inadequate ; 
of the other, which he obtained in considerable numbers, we have a 
detailed description and fairly good figures. In this latter species, 
which he describes as Hirudo vittata, a name originally proposed by 
Chamisso and Eysenhardt (1821), the two regions of the body are well 
defined, the posterior region bears paired lateral pulsating vesicles, 
there are no eyes and we have clearly an example of Trachelobdella. 
Johnston (1845) under the name Piscicola marina, which in his 
Catalogue of British species (1865) is changed to Pontobdella littoralis, 
gives an indifferent description of a leech parasitic on Aspidophorus 
cataphractus from the coast of Northumberland, with which he considers 
Dalyell’s Hirudo vittata to be synonymous. To Johnston’s species 
Thompson (1856, p. 426) refers three leeches from the Irish coast 
taken respectively from Lophius sp., from a halibut and from a cod 
and MTntosh (1875, p. 114, pi. 5, figs. 3—6) ascribes a form, of which 
he gives coloured figures, said to be not uncommon on Coitus bubalis, 
at St Andrews. 
In 1864, van Beneden and Hesse described three species of Callio- 
bdella { = Trachelobdella ), viz :— C. lophii, parasitic on Lophius jnscatorius, 
C. punctata parasitic on Cottus bubalis, and C. striata. Insufficient and 
inaccurate as the descriptions and figures are, it is evident that Hirudo 
vittata and C. lophii are synonymous and that Pontobdella littoralis has 
affinities with the other two forms. 
Finally Scott (1901, p. 138) records from the coast of Scotland a 
leech which he describes as Trachelobdella lophii, found “ In the gill 
pouches of the angler-fish, Lophius piscatorius, captured in the Firth of 
Forth (1894), and in the Moray Firth (1899).” 
From the above evidence it is clear that Trachelobdella is repre¬ 
sented upon our coasts, and that in more than one instance we have 
records of a form which appears to be identical with the Trachelobdella 
(Calliobdella ) lophii of van Beneden and Hesse. 
Whether or not T. lophii is a good species remains to be considered. 
Apathy (1888 c) unhesitatingly refers C. lophii, C. punctata, C. 
striata, Pontobdella littoralis (Johnston) and perhaps H. campamdata 
(Dalyell) to one species, Calliobdella lubrica (Grube), of which he 
