AMPIIIPODA AND ISOPODA OF THE FIRTH OF CLYDE. 



13 



Ampelisca Gaimardi. 



laevigata. 



tenuicomis. 

 Anonyx serratas. 

 Aora gracilis. 

 Atylus Sivammerdamii. 

 Batliyporeiapilosa, 8 and ? . 

 Calliope hcriuscula. 

 Cheirocratus Sundevalli. 

 Corophiiun Bonellii, 8 . 

 crassicorne. 

 Dexainine spinosa. 

 Eur y dice pulchra. 

 Gammarus locusta. 



marinus. 

 Gossea microdentopa. 

 Hyale imbricatus. 



Hyalc Lubbock iana. 



Nilssoni. 

 Hyperia medusa/rum, and 

 var. 



Idotea p«raZ/e/<7. 



f iicuspidata. 

 Lysianassa Costa\ 



longicomis. 

 Mcera Othonis. 

 Melita obtusata. 

 Monoculodes ccqiiimanus. 

 Pherusa bicuspis. 

 Proto ventricosa. 

 Protomedeia Wliitei. 

 Stenothoe monoculoides. 

 Urothoe marinus, $ and $ . 

 norvegica. 



Another useful appliance, called the dip-net, con- 

 sists of a stout ring of galvanized iron about ten 

 inches or a foot in diameter, with a thin strong 

 bag attached, about twenty inches deep, and rounded 

 at the bottom. The coarse material called "cheese- 

 cloth" answers the purpose very well. The ring is 

 fitted with a strong handle ten or twelve feet long ; 

 and by this means the algae and zostera-beds in 

 shallow water may be swept from the side of a row- 

 boat. The net may be also used, without a boat, for 

 sweeping along the edges at low water among weedy 

 and stony ground; and many good things may thus 

 be obtained from spots where the dredge cannot 

 work. We may assume that the more suitable 

 the appliances are for the different grounds we 

 have to work on, the greater our success is likely 

 to be. On this point I may remark that many 

 species are in one sense justly considered rare, i.e., 

 with the usual means of finding them, their haunts 

 and habits being unfavourable for the ordinary 

 means of capture. This accounts in some measure 

 for our being indebted for many of our rarer 

 species to the stomachs of birds and fishes. The 

 small Ostracod Philomedes interpuncta, Baird, for a 

 long time appeared from my gatherings to be 

 moderately rare ; but when the surface-net was used 

 after sunset this species was occasionally met with 

 in great abundance. With regard to many others 



