IVAR TRÄGÅRDH, 
(Schwed. Slidpolar-Exp. 
The hypostoma rather long (PI. II, fig. 15) with the usual four pairs of hairs. 
Maxillary lobes rather large, sharply pointed. 
The mandibles (PL II, fig. 8); the lower jaw slightly shorter and more curved 
than the upper one, with two anterior, small, and one posterior, large tooth, besides 
the terminal tooth. The upper jaw with two small teeth opposite the terminal tooth 
of the lower jaw, two others exactly opposite the median ones of the lower 
jaw; between these the sense-hair, behind them a small incision and a high, 
sharp edge. 
The palpi rather long, measuring 0,23 mm, with 5 free joints; the first four joints 
of about equal length, the third (second free) somewhat swollen; the terminal joint 
more narrow and only half as long as the fifth, richly provided with hairs. 
The legs. Legs I a little longer than the body, o,6 S mm, II o, 39 mm, III 0,42 mm, 
IV 0,54 mm, all richly provided with setiform hairs. 
Ambulacres I with smaller claws than the others and a caruncle which is only 
two-lobed (Text-fig. 33). Ambulacres II — IV with larger claws and three-lobed 
caruncle; the median lobe more pointed than the lateral ones (Text-fig. 32). 
Locality : No. 8. One nympha. 
Tectopenthalocles nov. gen. 
General shape like that of Penthalodes MURR. Capitulum reduced. Epirostral 
plate present, three-lobated. No pigmented, eyelike structure. Palpi 4-jointed. 
Type: T. villosus Trt. 
In the description of P. arcticus Tgdh. [13, p. 42] I already pointed out that 
that species differed from the other species of the genus Penthalodes in some essential 
respects. The differences are: the reduction of the capitulum and the presence of 
an epirostral plate. In Penthalodes and indeed in most of the other genera of the 
sub- family Eupodinæ, except Ereynetes and Stereotydeus , there is at the base of 
the rostrum a spherical so-called capitulum, with two hairs; but on the other hand 
there is no epirostral plate. 
In P. arcticus Tgdh. the capitulum is greatly reduced and modified into a 
circular, depressed area, with two small hairs and there is a slight indication to an 
epirostral plate in shape of a cuticular fold of the anterior edge of the céphalothorax. 
In T. villosus Trt. it is still more reduced, being only represented by a small 
oval area with two small hairs, situated at the base of the epirostral plate; the area 
is not distinctly demarcated as in the case of P. arcticus , but its texture differs from 
that of the other cuticle in being smooth, while the cuticle round it is sculptured. 
