248 LIVEEPOOL BIOLOGICAL SOCIETY. 



as a few of these and no other adult males and a large number 

 oi D. hradi/i — all females or immature males, and no other 

 species of female — have been taken together in Colwyn Bay 

 on more than one occasion, it is impossible to suppose 

 that they can be other than the same species. Prof. G. 0. 

 Sars, to whom I sent specimens, has been good enough to 

 inform me that he was misled by a damaged specimen of 

 D. sp'mosa in referring to it as its female I), echinata, 

 Bate.* He adds, " I now regard your identification of 

 D. sphiosa as the adult male of D. hradtjl to be most likely 

 correct." The immature male attains its full growth 

 before acquiring the spinous pleon of the adult, this being, 

 until the last moult, even less spinous than in the female. 



7. Pseudocuma cercaria, van Beneden. 

 Very abundant in sand ; Colwyn Bay. 



8. Cymadocea emarginata, Leach. 

 Sphwroma rugicauda, Leach. 



These were found together in a dead Balamis shell, a 

 circumstance which lends support to Hesse's opinion that 

 Sphceroma is the female of Cymadocea A 



9. Astacilla longicornis, Sow. 



Arcturus longicornis, Bate and Westwood. 



Two specimens were taken, one at low- water with the 

 young (which, being cream-coloured, contrasted strongly 

 with the dark brown parent) attached to the long outer 

 antennae, as described by Bate and Westwood, by their 

 hind legs. They sometimes left their perch and returned 

 to it after swimming about. This species has been re- 

 corded from the mouth of the Dee by Mr. Byerley. 



10. Metopa ruhro-vittata, G. 0. Sars. 



This appears to be rather a common species in Colwyn 

 Bay. Two or three specimens were beautifully and 



* " Clialleiiger" expedition, Zoology, Report on Cnniacea, p. 50. 

 t Ann, des Sciences Nat., r)tli ser,, vol. xvii., p. 1, &c. 



