34 Description oj Genera and Species. 



similar sculpture to that found on the embossed portions of the tergites of the tail seg- 

 ments, and also with the transverse slits. It appears to have supported accessory 

 swimmerets articulated with it near the base of the terminal lobule. 



The eyes are very large, and were evidently placed on very short stalks (figs. 2, 3, 6), 

 but they are too much crushed to show whether there was any ocular papilla. The 

 antennules (figs. 3, 6) are supported upon large three-jointed peduncles which extend 

 beyond the antennal scale, but not so far as the tip of the rostrum. The basal joints 

 are elongated and hollowed out for the eyes to move freely, as in the recent Lophogastrids 

 and Euphausiids with large eyes. The mid-joint is nearly quadrate in shape when 

 flattened out, and not short and swollen as in Gnathophausia. It is ornamented with a 

 longitudinal spinose ridge set obliquely inwards, is fringed on its inner margin with 

 sette, and terminates on its inner side in a spur. The terminal joint is a little longer 

 than broad, bears a median ridge, and gives ofl'two moderately long many -jointed lashes, 

 the first joints of which are elongated and leaf-like. The external branch is the stouter 

 and longer of the two ; but there is not the marked difference between them that occurs 

 in their modern congeners. The antenna (figs. 3, 6) is altogether more massive than in 

 G7iathophausia. There is a short stout scale toothed on its outer margin, constructed as 

 in the true caridea. It does not reach beyond the base of the lash. The basal joint of 

 the peduncle has not been observed. The second joint is tumid and tuberculated, and 

 the third joint is more elongated and the articulation between the two joints has great 

 play. The terminal lash is very massive and longer than the carapace, and circular in 

 section as shown on the right side of fig. 3, while that of the left side is evidently flattened 

 through being crushed. The mandibles are verj' strongly developed and the body is 

 tumid, but the details of the biting and molar portions are not easily made out (figs. 2, 3). 

 The palp is three-jointed and pediform, as seen in fig. 3, the right one being attached to 

 the body and the left one seen outside the left antero-lateral spine. The maxillaa are 

 seen displaced in fig. 2, but not in a fit state for study. The biting edge of the first 

 maxilla is the only structure that can be made out with any approach to certainty. 

 Three of the flattened tumid joints of the endopodite of the maxillipedes ai-e seen pressed 

 on to the body of the mandible in fig. 2. This part of the limb seems to have been 

 much as in Gnathophausia. The legs on the seven last trunk segments appear to be con- 

 structed and arranged on a similar plan to that in Tealliocaris. Six of the endopodites are 

 seen in regular succession, not much displaced (fig. 3), all lying within the margin of the 

 carapace. The specimen, fig. 3, which belongs to Mr E. Dunlop is fossilised partly in iron 

 pyrites and shows a back presentation in which a large part of the carapace has split 

 away with the counterpart, and so allows the limbs and many of the ventrally situated 



