CIROLANA SPINIPES. 301 



terminal segment of the pleon is as long as the preceding 

 three segments united; it is somewhat triangular, with 

 the lateral margins rounded and the extremity rather 

 pointed; the lateral appendages of this segment are 

 thin, the inner plate larger than the outer, elongate- 

 ovate, scarcely pointed at the tip ; and the basal joint is 

 prolonged into a short triangular point, corresponding 

 with, the " grande dent lamelleuse et aceree qui atteint 

 le milieu des lames terminales" of C. hirtipes as described 

 by Milne Edwards. 



A specimen of this species was first noticed by the 

 late Mr. W. Thompson, which was procured in a fishing 

 boat in Dublin Bay, by Mr. T. W. Warren, in 1847. 

 This specimen has furnished the figures at the head of 

 this description. Another specimen is in the British 

 Museum, from Belfast Bay, taken out of a holibut, and 

 several specimens are in the Hopeian collection, at 

 Oxford, one of which is labelled " Brighton," and 

 another was, we believe, taken off the Yorkshire coast. 

 We have also received it from the Moray Frith, where it 

 was taken by Mr. Gregor. 



M. Hesse, Ann. des Sc. Nat. vol. v. p. 257, 1867, 

 describes several species of this genus that he has taken 

 burrowing in the sand on the coast of Britanny. 



