240 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Of the numerous British species, P. aurora Salter, P. hickst Salter, 
and P. forchhammert Angelin have the glabella reaching on to the rim, 
P. davidis is of the P. tessint type with the elongated terminal spines 
of the pleura, as is also, presumably, P. bohemacus salopiensis Cobbold, 
of which the thorax is not known. P. groomi Lapworth is of the P. 
harlani type, P. harknessi Hicks agrees with the new species in the 
presence of a furrow between the glabella and rim, but the eye lobes 
are much longer and more narrow, and the glabella is narrower and 
retains the first pair of furrows. P. intermedius Cobbold is quite 
similar in form of glabella, groove and rim, to P. haywardi, but the 
palpebral lobes are too long and reach both the neck ring and the 
glabella. The Paradoxides rugulosus Hawle and Corda, Cobbold, also 
has the long eye lobes and the first pair of glabellar furrows, and, 
moreover, differs from the true rugulosus in lacking the furrow which 
should separate the glabella from the rim. 
Turning now to the Scandinavian species, we find that P. forch- 
hammert Angelin, P. hickst palpebrosus Linnarsson, P. oelandicus 
Sjogren, and P. tuwmidus Angelin all have the glabella reaching the rim, 
and most of them have other features in which they differ strikingly 
from P. haywardi, while P. affinis Angelin, and P. tessina Brongniart 
and its varieties of course have the long terminal spines on the pleura. 
P. tuberculatus Angelin is known only from a fragment which has a 
large tubercle on the fixed cheek opposite the basal lobes of the glabella. 
P. brachyrhachis Linnarsson appears to be a rimless species with four 
pairs of glabellar furrows, and so comparable to P. harlani, while P. 
aculeatus is based on a very immature specimen. ‘There is, therefore, 
no Scandinavian species very closely allied to P. hayward. 
Of the Bohemian species, P. bohemicus (Boeck) is quickly eliminated 
because in the adult the glabella reaches the rim and the terminal 
segments of the pleura are elongated. P. desideratus is probably not a 
Paradoxides, but possibly an Albertella, and P. expectans also is doubt- 
fully a Paradoxides. P. imperialis is known only from a fragment of 
the thorax, while P. inflatus Corda, P. pusillus Barrande, and P. 
orphanus Barrande are evidently based on very immature specimens. 
P. spinosus and P. rotundatus Barrande both have glabellas which 
in the adult touch the anterior rim and retain all four pairs of furrows 
in most cases. P. rugulosus and P. sacheri both have the groove in | 
front of the glabella, but P. rugulosus has very long eye lobes, touching 
the glabella and occipital ring, while P. sacheri has very short diagonal 
furrows and very curving spines on the thorax. P. lyelli has a long — 
narrow glabella which touches the marginal rim. 
