70 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



and proximal halt of the telson are channeled. Length, about 

 16 mm. 



This is evidently a rare species in the Scottish seas, and there 

 are only two records hitherto for the Clyde, two specimens from 

 Lamlash Bay (Norman), and one specimen off Muggie Point in 

 20 fathoms (Henderson). I have taken two specimens altogether 

 of this species, one from off the Bullwood, Dunoon, in eight 

 fathoms (1892), and one from off Inchmarnock in fourteen 

 fathoms, hard ground (1901). 



GENUS PONTOPHILUS, Leach. 



Pontophilus spinosus, Leach. — The rostrum in this species has 

 a strong spine on each side near to the base. The carapace is 

 armed with five longitudinal ridges, which are much more regular 

 in form, however, and the teeth thereon more prominent than in 

 Philochems echinulatus. The central ridge and the principal 

 ridge on each side are armed with three strong spines. On the 

 other lateral ridges there are two teeth near to the proximal end. 



This species is distributed from the mouth of the Gareloch to the 

 boundary of the Clyde sea-area, and I have noticed its occurrence 

 in the principal lochs and in many places over the Barrier 

 Plateau. It is moderately common throughout the deep water of 

 the Arran basin, having been trawled in depths up to 107 

 fathoms. I have also frequently dredged it in comparatively 

 shallow water. 



Females had ova during April, July, and August. Largest 

 specimens measured about 55 mm. in length from apex of rostrum 

 to the end of telson. 



GENUS CRANGON, Fabricius. 



Crangon vulgaris (Lin.). — This is the commonest species in 

 the Firth of Clyde, belonging to the family Crangonidae. and is 

 found in abundance along all our sandy shores. I have also 

 found it in the River Clyde about one mile to the east of Lang- 

 bank in the mud-pools which are left by the ebb tide, where the 

 water is quite brackish. It was in company with Gobius minutus, 

 Gmel., Pleuronectes Jlesits, Lin., Sphaeroma rugicauda, Leach. 

 Idothea viridis (Slabber), and G'ammarus locusia (Lin). 



