71 
the deeper pools. On the night of the 13th September, this form 
was fairly abundant in the bottom net, especially in the young 
condition. 1 did not get it in the isolated hauls made elsewhere on 
the coast. The spinulation of the telson is subject to a good deal of 
variation. The number of spinules intervening between the spines 
increases with age, and like the spines, each group of spinules 
increases in size distally. 
Locality : — Cullercoats. 
Sub-family — Mysin.k. 
Uemimysis lamorti/r (Couch i. 
Several young specimens evidently referrable to this species 
were got frequently during the summer in the harbour, though only 
in small numbers. I briefly described the specimens to Canon 
Norman, and he replied that they were likely to be this species. 
The matter was put beyond doubt on the night of the 18th September 
when an adult male was got in the bottom net. It was fairly 
common in the catch at Craster (28th September), in the young 
condition, and two adult males were procured likewise. 
Localities : — Cullercoats, Craster. 
Macromysis ilexuosa (Muller). 
This form is, of course, the only Mysid found in the higher 
pools, but in the lower pools and even in the harbour, it is very 
common in company with the other species mentioned. M. neglecta 
has not been met with. There was never the least difficulty in 
separating the Macromysis forms into jle.vuosa and inermis. llolt 
and Beaumont " have made a careful analysis of the two species, 
M.Jiexuosa and M. neglectu, from their collections, and their results 
throw some doubt on the validity of M. neglecta. Attention to the 
characteristic chromatophores would prevent any confusion with 
such another form as M. inermis. 
Localities : — Cullercoats, St. Mary's Island, Druridge Bay, 
Alnmouth Bay, Holy Island (where it is very abundant in the 
harbour and on Fenham Hats). In a trial with a net this year 
in the Tay at Broughty Ferry, only 2 specimens of this species 
alone were obtained. 
Macromysis inermis (Rathke). 
This is by far the commonest species in the harbour. It also 
occurs in the deeper water just beyond the rocks, and in the lower 
pools, See. The following measurements were made from the 
specimens retained : — 
* Report on the Crustacea Schitopoda of Ireland, Hoy. Dub. Soc. (>erie> II.) 
vol. VII., part VII., April, l'.lOO. 
