froTTi the Coal-measures of Rochdale. 



355 



the hinder margin, which is parallel to the anterior, bends at about two-thirds 

 of its length at an obtuse angle towards the apex of the anterior margin. 

 In the middle of this oblique-inferior margin oval thickenings make their 

 appearance, which I regard as remains of branchiee which were attached here to 

 the base of the lobe of the unjointed swimming- feet. The substance of these 

 swimming-feet seems to have been membranous and of a blackish-brown colour. 



This is the only record of a Palaeozoic form of supposed Anostracan 

 Branchiopod that I have met with. 



I have, however, described an undoubted species referable to 

 this division of the Branchiopoda (the Anostraca) from the Eocene 

 (Bembridge) freshwater limestone of Gurnet Bay, Isle of Wight, 

 which I named Branchipodites vectensis (see Quart. Journ. Geol. Soc, 

 May, 1879, vol. xxxv, pp. 345-6, pi. xiv, figs. 6-10). It is 

 interesting to mention that in this case both the males with their 

 large clasping antennae, and the females with small antennae and 

 egg-pouches, with large and very distinct disk-like bodies (the 

 compressed eggs), can be seen distinctly in numbers upon the slabs 

 of limestone from Gurnet Bay. 



Fig. 2. Bochdalia Parkeri, H. Woodw., gen. et sp. nov. Middle Coal- 

 measures : Sparth, Eochdale, Lanes. Enlarged three times nat. size. 

 t. telson ; bf. branchial feet ; p. proboscis ; e. position of eye ; d. diagram 

 of pedunculated eye (restored). 



Description of the Rochdale specimen (Fig. 2). — The head, which 

 is rounded in outline anteriorly, is 5 mm. in breadth and 9 mm. in 

 depth, its widest part being the broadly expanded downward ex- 

 tension of the beak-like proboscis {p.)} The position of the eye (e.), 

 which was no doubt pedunculated, as in the living examples of the 

 Anostraca, is marked by the broken base of the peduncle ; a suggested 

 restoration of the eye (e.) is given separately above the head. 



The four body-segments following behind the head are the largest, 

 being equal in breadth to the seven succeeding segments, and they 

 have also the longest recurved lobe-like swimming-feet {if.); the 

 seven hinder segments gradually diminish in depth backwards from 

 10 mm. to 5 mm. The segments are marked by a minute line, 

 probably indicating the points of attachment of the branchial lobe 

 to each of the swimming-feet ; there is also a median dorsal line 

 marked by a minute but distinct ridge, indicating the articulation 

 of the body-segments to each other. The telson (t.) is 7 mm. in 



^ The proboscis is probably too small to indicate a male, but there is no trace 

 of an egg-pouch to definitely fix the specimen as a female. 



