I916, No. 10. THE LOWER CAMBRIAN HOLMIA FAUNA. 77 



anterior wings. The posterior section is narrow and with the narrow 

 margin forms a broad and short protuding posterior part, which has a 

 rounded margin without spines. (Fig. i, pi. XII and text-figure 13) 



As in the case of Holmia the hypostome is firmly attached by the 

 hypostome attachments. As a rule the limits are indicated by a fine raised 

 line, which is now regarded as an obliterated suture. The hypostome 

 attachments are unusually broad and only slightly narrow posteriori v. Thev 

 correspond with the marginal brim of the upper side. 



N 



i/ 

 I 



Fig. 13. Kjentlfia lata nov. gen. & sp. Under side of the crani- 

 dium in outline with doublure, h^-postome attachments and hypostome. 



The number of thoracic segments cannot be determined with certainty, 

 is probable that there were 18. As in the cranidium. the axis is broad, 

 and to begin with (at the first 8 segments! is almost uniform in breadth, 

 and then decreases somewhat quickly in breadth. In the usual pressed 

 condition the dorsal furrow is only slightly marked. It is most strongly 

 marked by deep incisions in the posterior margin of the segments. (To be 

 further discussed in a later section). FVom this point faint furrows run 

 in a curve inwards towards the central spines, and eftects a kind of bifur- 

 cation OÏ the axis. 1 he anterior part extends outwards in an arc, (fig. 4, 

 pi. XII) in an even more striking manner than in Holmia. The pleurae 

 are very broad and terminate in long curved, falcate pleural spines. The 

 inner part is provided with a long oblique furrow, that stretches outwards 

 to half the length of the pleurae. The posterior pleurae regularly decrease 

 in size and curve more and more backwards and finally surround the little 

 pygidium. 



As we have stated, the occipital segment is provided with a quite low 

 and wart-shaped spine. The first segments, too. have quite low, receding 



