ON DREDGING OFF THE DURHAM AND N. -YORKSHIRE COAST. 193 



TESTACEOUS MOLLUSCA. 



The letters c, mc, r, nir, signifying common, moderately common, rare, moderately rare, 

 refer only to the hauls in which the species were taken. Those marked * are new to the 

 district. 



Brachiopoda. 



Argiope capsula, JefF. 4 miles off Robin Hood's Bay, 30-35 fathoms ; bottom broken 

 shells and zoophytes. 



CONCHIFEKA. 



Anomia ephippium, Linn. : mr. Small in most of the gatherings where the ground 



was hard. 



, var. aculeata, Miill. : mr. Small in most gatherings on hard ground. 



Pecten ptesio, Linn. : mc. 4-G miles off Hawthorn and Redclitf, 20-30 fa. ; gravel 



and dead shells. 



opercularis, Linn. : mr. The living all small in various gatherings. 



tigrinus, Jliill. : mc. Off Hawthorn, Staiths, RedcUff, and Robin Hood's 



Bay, 20-37 fa. ; gravelly. 



similis, Laskey : mr. 5 miles off Redcliff, 30 fa. ; gravel and dead shells. 



striutus, Miill. : mr. Off Castle Eden and Redcliff, 20-30 fa. ; gravelly. 



* varius, Linn. Dead, off Robin Hood's Bay, 30 fa. ; gravel, dead shells, and 



zoophytes. 

 Mytilus edulis, Linn. : r. Dead shell, off Redcliff, 30 fa. ; gravel and dead shells. 

 modiolus, Linn. : mc. Small, none above an inch, (3 miles off Hawthorn, 



37 fa. ; sandy gravel. 

 Lima Loscomhii, G. B. Sow. : mr. Hawthorn and Redcliff, 20-37 fa. ; sandy 



gravel and dead shells. 

 submtrictdata, Mont. : mr. 5 miles off Redcliff, 30 fa. ; sandy gravel and 



dead shells. 

 Modiolaria discors, Linn. : mr. 6 miles off Hawthorn, 20 fa. ; sandy gravel. 



nigra, Gray : r. Dead valves, off Staiths, 25 fa. ; gravelly. 



marmorata, Forbes. In the Ascidia mentida, off Seaham, 35 fa. ; gi-avelly 



sandy mud. 

 Crenella decussata, Mont. : c. 14 miles off Seaham, 35 fa. ; sandy mud. 

 Area tetragmia, Poli : r. Small, 5 miles off Castle Eden, 20 fa. ; coarse gravel. 

 Nuculus nucleus, Ijinn. : Hawthorn and Redcliff, 20-30 fa. ; sandy gravel and 



dead shells. 



tenuis, Mont. : c. Fry 20 miles off Sunderland, 45 fa. ; muddy sand. 



nitida, Sow. Dead shell, with the last. 



Leda (caudata) minuta, Miill. : mc. In most of the gatherings. 

 *Pectunculus glycijmeris, Linn. A dead shell, 5 miles off Redcliff, 30 fa. ; gravel and 



dead shells. 

 Cardium echinatum, Linn. Dead valves, 5 miles off Robin Hood's Bay, 30 fa. ; 



gravelly. 



exiguum, Gmel. : r. With the above. 



cdide, Linn. : r. Dead valves, off Durham coast. 



fasciatum, Mont. Off Hawthorn and Castle Eden, 20-27 fa. ; sandy gravel. 



norvcgicum, Spengl. : mr. Dead valves, 6 miles off Hawthorn, 20 fa. ; 



sandy gravel. 

 Liicina hnrealis, Linn. : r. 8 miles off Staiths, 25 fa. ; sandy gravel and dead shells. 

 Aximisjlexuosus, Mont. : r. 5 miles off Hartlepool, 35 fa. ; muddy sand. 

 *Diplodonta rotunda, Mont. 6 miles off Hawthorn, 37 fa. ; sandy gravel. 

 Kellia suborbicularis, Mont. : mr. Off Hawthorn and Redcliff, 20-30 fa. ; sandy 



gTavel. 

 Montacuta substriata, Mont. : mc. Off Redcliff and Robin Hood's Bay, 30 fa. ; 



gravel and dead shells. 

 Cyprina islandicn, Linn. : mr. Small, off Marsden and Redcliff, 30-33 fa. ; gravel 



and muddy sand. 

 Astarte sulcata, Da Costa : c. 5 miles off Hartlepool, 35 fa. ; muddy sand. 



compressa, Mont. : mc. AVith the above. 



triangularis, Mont. : mr. With the above. 



1875. • o 



