G. W. ColemiU — Note on the Osborne Beds. 99 



depth of the carapace is 5 mm., and the pleon at the third somite is 

 of the same depth. The appendages are not preserved, nor can the 

 serrations on the rostrum be clearly detected. 



This may possibly be a young form of the larger species with 

 which it is found associated, but of that we have no" positive 

 evidence before us ; it is therefore most convenient to treat it as 

 distinct. Both species occur pretty abundantly in the same bed 

 which yielded the small Glwpea vectensis, described by Mr. E. T. 

 Newton, F.E.S., and are in all probability either estuarine or 

 marine. The living Palsemonidse occur, not only in the sea, but 

 also in rivers, in Lake Amatitlau Guatemala, the islands of the 

 Pacific, and one in Australia, Palcemon affinis, PI. V, Fig. 8 (see 

 " Voyage of Challenger " ; Crustacea, by 0. Spence Bate, 1888, 

 vol. xxiv, p. 782, pl. cxxviii, fig. 5). Two genera are British. 



In this genus (Palcemon) the most striking feature is the elong- 

 ation of the second legs in the male, which not infrequently even 

 exceed the total length of the animal's body ; a specimen oi Palmmon 

 lar may measure about five inches from the front margin of the 

 carapace to the tip of the telson, and carry limbs eight inches long. 

 (See " A History of Crustacea," by Rev. T. E. E. Stebbing, F.E.S., 

 pp. 246-247.) 



The following account (Art. II) of the geology of a portion of 

 the Osborne Beds of the Isle of Wight, whence the fossil Crustacea 

 were obtained, has been most obligingly drawn up for me by 

 Mr. G. W. Colenutt, F.G.S., the first discoverer of the fossils. 



EXPLANATION OF PLATE V. 

 Figs. 1-4. — Propalcenion Osborniensis, H. Woodw. Osborne Beds : Isle of "Wight. 

 Figs. 5-7. — FropalcBmon minor, H. Woodw. Osborne Beds : Isle of "Wight. 

 Fig. 8. — Falcemon affinis, M. Edw. Eecent : Port Jackson, Sydney, New South 

 "Wales. 



11. — Note on the Geology of the Osbokne Beds.^ 

 By G. W. Colenutt, F.G.S. 



THE fossil shrimps or prawns briefly described in the preceding 

 paper by Dr. H. "Woodward occur in the ' fish-clay ' of the 

 Osborne Series at Chapelcorner Copse, Binstead House, Eyde House, 

 and Sea View, Isle of Wight, and they were first discovered by me in 

 these beds about the year 1876. Having regard to the fact that 

 new species of fish, etc., have been recently obtained from the 

 Osborne Beds, it would seem that these prawns are very probably 

 also new to English strata. 



At nearly all outcrops of these beds the strata yield few fossils, 



' The foUomng is a list of the papers bearing on the present article : — 

 G. W. Colenutt, " On the Osborne Beds" : Geol. Mag., 1888, p. 358. 

 E. T. Newton, "On Clnpea vectensis'': QJ.G.S., February, 1889, vol. xliv, 



pp. 112-117, pl. iv. 

 E. T. NeAvtou, "Geology of the Isle of "Wight": Memoirs of Geological Survey, 



1889, p. 152 et seq. 

 E. T. Newton, "On^mia": Q.J.G.S., February, 1899, vol. Iv, pp. 1-10, pl. i. 

 G. "W. Colenutt, "Notes on Geology of the North-East Coast of Isle of "NVight" : 



Papers and Proceedings of the Hampshire Field Club for 1891. 



