308 



THE ZOOLOGIST. 



Outside the occasions mentioned only rare casuals were obtained 

 in these localities. Occasional specimens have also been taken 

 at Porfcwrinkle, in rock-pools at Polperro and Gorran, in Mount's 

 Bay, and at St. Ives (Vallentin). About the end of May, 1902, a 

 Mackerel-drifter reported an enormous shoal between forty and 

 fifty miles south-west of the Dodman, and brought in a sample 

 for identification. Females have been taken in berry from 

 November to April. Palcemonetes varians (Leach), a brackish- 

 water Shrimp, is common about Plymouth (M. B. A.), has been 

 taken at Looe, and in quantity at Par. It is occasionally fairly 

 common about Falmouth, and has been captured several miles 

 up Tresillian Creek. It breeds from April to June. 



Leander squilla (L.) is not uncommon between tide-marks in 

 Plymouth Sound (M. B. A.), but elsewhere is scarce and local. It 

 has been taken in rock-pools between Longstone Rock and Down- 

 derry, and Couch records it from Polperro. A few, including 

 two females in berry, were taken near Gorran early in July, 

 1900, and in May, 1901, females were obtained in similar con- 

 dition in deepish water to the south of the Dodman. A number 

 of small-sized specimens was dredged in 13 fathoms to the 

 south-east of Longstone Rock in September, 1906. It has been 

 found at Scilly by Norman, and W. Borlase caught two one 

 afternoon in April in a rock -pool on the south side of Annet. 

 The Common Prawn, L. serratiis (Pennant), is more or less 

 plentiful everywhere on the south and in many places abundant, 

 among weeds, in rock-pools, and among the rocks at low-water. 

 At Scilly it is usually present in great abundance. On the 

 north coast it is often scarce and its distribution is at all times 

 irregular. On the south coast it appears to breed all the year 

 round. 



