Mr. E. J. 'Mlevs 0)1 a Freshwafer Crustacean, 193 



wards the periphery of the colony, wliere they are 2 raillim. 

 in long diameter (exclusive of verrucas) , being flattened at this 

 point. 



Cortex compact, from "5 millim. thick on stem, to '26 millim. 

 on apical portions of branches ; surface minutely ridged lon- 

 gitudinally ; no longitudinal grooves. Verruct>i prominent, 1 

 to 2 millim. apart, truncate-conical, 2 millim. long by '75 

 millim. in apical diameter, flexible, and apt to become flattened 

 at their external halves ; equally distributed over stem and 

 lower parts of branches, but towards free ends becoming almost 

 confined to the lateral surfaces. Axis hard, smooth. 



[Spicules of cortex of one kind, viz. (i.) double-headed 

 forms with very narrow bare median space, the heads being 

 covered with about three series each of small smooth rounded 

 tubercles ; size '106 by "062 millim. Spicules of verrucaj of 

 two kinds, viz. : — (ii.) cylindrical, rather blunt, tuberculate, 

 with numerous small rounded tubercles irregularly scattered all 

 over, size "123 by "044 millim. ; (iii.) fusiform, pointed at 

 ends, with slight median bare space, and on each side of this 

 about four whorls of tubercles like those of nos. i. and ii. ; 

 size '142 by "044 millim. Colour pure white, that of axis 

 yellowish brown. 



Hah. Mauritius, 90 fathoms (coll. Brit. Mus.) . 



The very flue and perfect single specimen was collected by 

 Mr. V. de Robillard at Mauritius ; it is 20 inches (5U0 millim.) 

 in maximum height, 15 inches (375 millim.) in maximum 

 lateral expansion of branches. 



Ohs. The very long verructe appear to distinguish this from 

 all, and the peculiar mode of branching from most, Verrucellce j 

 in the latter point it resembles V. granifera, KoUiker (Icon. 

 Histiol. p. 140, pi. xix. flg. 4), the spicule flgured by that 

 author being of similar character to, though more pointed 

 than, no. ii., described above; but the verruca3 of that species 

 are described as but slightly prominent and the coenenchyma 

 as yellowish brown ; it is recorded as from the coast of Africa. 

 I do not feel sure what ought to be the name of the genus j 

 KoUiker seems to have based his genus on the later rather 

 than the earlier species of Milne-Edwards and Haime's genus. 



XXIII. — Note on a Freshwater Macrurous Crustacean from 

 Japan (Atyephyra? compressa, De Haan '?). By Edward 

 J. MiERS, F.L.8., F.Z.S. 

 The specimens which are the subject of this note were sent 

 to the British IMuseum by my friend Dr. P. Mayer, of Naples, 

 with the request that I should determine the species. They 



