290 



Br. H. Woodward — On a Neio Lias Crustacean. 



line of the carapace, as seen in profile in our specimens, was much 

 arched, and the anterior portion bends down to terminate in a short 

 and blunt rostrum. 



The orbital fossa forms a deep hollow on either side of the blunt 

 rostrum giving insertion to the eye-peduncles ; the bases of the 

 antennae take their rise from the outer border of the orbits. 



The carapace is mai'ked at its posterior margin by a double line 

 or raised border, and is somewhat roundly inflected mesially, to give 

 insertion to the abdominal somites; but it again expands roundly on 

 the postero-lateral border over the branchial region. 



None of the usual divisional lines or prominences, marking the 

 regions of the carapace, are visible on this Crustacean, and, save a 

 small marginal ridge on the hepatic border, near the orbital fossa, 

 the carapace is otherwise quite plain. 



Length of carapace 60 mm., depth from dorsal line 25 mm. 



The antennules have slender multiarticulate flagella 15 mm. in 

 length. The antennse have three robust and very rugose basal 

 joints, 15 mm. long, succeeded by a stout but tapering many-jointed 

 flagellum nearly 25 mm. in length, reminding us of the stiff outer 

 antennse of Falinurus. 



The thoracic limbs are stout and rugose, all their extremities are 

 monodactylous. The first pair is the most robust, the second is 

 nearly equal in size to the first ; the third and fourth pairs are more 

 slender and nearly as long ; the fifth pair is much the smallest. 



I subjoin the measurement of the five thoracic limbs in millimetres. 



Limbs of thorax.., 

 1st joint or Coxa 

 2iid „ Basos 



3rd 

 4th 

 5th 

 6th 

 7th 



Ischium .. 



Meros 



Carpus .. 



Propodos 



Dactylus.. 



Total length 46 



I. 



II. 



III. 



IV. 



3? 



3 



3 



3 



4? 



4 



4 



4 



7 



6 



7 



4 



13 



12 



9 



8 



6 



5 



5 



5 



6 



6 



8 



9 



7 



6 



5 



5 



46 



42 



41 



38 



32 



The figures of the fossil drawn in the Plate do not sufficiently 

 show the rugosity of the limbs, which is a strongly-marked character 

 in the fossil. The abdominal somites are preserved more or less 

 perfectly in Mr. Charles Moore's specimen (Fig. 2). Their breadth 

 is about 7 mm. each, and extreme depth of profile of segment 19 

 mm. ; the epimeral border of the segments is lanceolate. The 

 segments were finely granulated on their margins. The caudal 

 plates appear to have been broadly rounded in outline, but they 

 are too imperfect to describe minutely. 



Total length of abdomen 55 mm. 



In most of our common living Macroura, the first and second pairs 

 of thoracic appendages resemble the last pair of the cephalic series, 

 being maxillipeds, or mouth-organs. The third pair are usually the 

 largest of the series, and are mostly chelate (serving as hands), the four 

 remaining pairs being commonly employed as the ambulatory legs. 



In the fossil before us neither the third pair, nor the four pairs of 



