LIFE-HISTORY OF BUCEPHALUS HAIMEANUS. 639 
seemed to him sufficient reason for the formation of a new 
genus. 
Ziegler (7, 1883, p. 549) shows the error in Wagener’s 
interpretation. 
Diesing also confuses the posterior with the anterior end in 
the three species named. 
Molin (8, 1858) describes a new species, G. armatum from 
Conger conger. 
Gervais and Beneden, 1858 (‘Zool. Med. II,’ p. 207), 
describe G. crucibulum = Monostomum crucibulum, 
Rud. 
Cobbold (9, 1858) gives a careful description and figures 
of G. gracilescens, which add little to the knowledge of 
that form. 
Diesing (10, 1859), in a revision of his classification, accepts 
three species of Gasterostomum : 
1. G. fimbriatum, v. Siebold. 
2. G.armatum, Molin. 
3. G. crucibulum, Gerv. and Ben.= M. crucibulum, 
Rud. 
Molin (11, 1861) gives a complete description and figures 
of his G. armatum, describing a cornucopizeform acetabulum 
and distinct genital apertures. 
Olsson (12, 1867) redescribes G. armatum, Mol., and G. 
gracilescens, Rud. 
Maddox (46, 1867) found what seems to have been young 
G. gracilescens encysted in the nerves of the haddock. 
He describes the vitellaria (sixteen on each side) and 
flame-cells, which he calls pulsating bodies, connected with 
the water vascular system. 
Van Beneden (18, 1871) gives as new species: 
G. vipere—intestine of Trachinus vipera, Cuv. 
» btrigle— 7 Trigla gurnardis, L. 
,» clupex— iF Clupea sprattus. 
» Vivee— FA Trachinus draco, L. 
»» Nova, sp. “3 Cyclopterus lumpus, hL. 
Of these new species he gives figures of two, G. trigle 
