392 



Messrs. Leckenby and Marshall 



Mactra solida, L. 



, var. elliptiea, Brown. 



subtruneata, l)a Costa. 



stultorum, L. 



, var. cinerea, Mont. 



(All the Mactra are of a much 

 thinner consistency than usual.) 



Scrobicularia prismatica, Mont. 

 Very large. 



nitida, Mull 



alba, Wood. 



Solen pellucidus, Perm. 



siliqua, L. 



Lyonsia norvegica, Chemn. 



Thracia prsetenuis, Pult. 

 * papyracea, var. gracilis. 



*Nesera cuspidata, Oliri. Mud, in 

 45 fathoms, 75 miles from 

 land. 



Corbula gibba, Olivi. A dwarf 

 form, in 86 fathoms. 



Mya truncata, L. 



, var. abbreviata. 



Saxicava norvegica, Spengl. Spa- 

 ringly distributed, and rarely 

 brought up in the dredge. 



rugosa, L. 



, var. arctica, L. 



, var. pholadis, L. 



Pholas crispata, L. Valves, pro- 

 bably drifted. 



Dentalium entalis, L. 



SOLENOCONCHIA. 



*Pentalium entalis, L., var. infun- 

 dibulum. 



GASTROPODA. 



Chiton cinereus, L. 

 *Tectura testudinalis, Mull. The 

 most southern limit hitherto re- 

 corded for this species is Hartle- 

 pool ; it would therefore appear 

 to be migrating southwards. 



Puncturella Noachina, L. 



Emarginula tissura, L. 



Capulus hungaricus, L. 



Trochus tumidus, Mont. Off Scar- 

 borough ; very large. 



cinerarius, var. electissima, 



Bean. 



Montacuti, W. Wood. 



zizyphinus, L. 



, var. Lyonsii, Leach. 



* occidentalis, Mighels. Three 



fine living examples, in gravelly 

 sand, 40 fathoms, about 85 miles 

 N.E. by E. off Scarborough. 

 Its nearest recorded locality, 

 according to Dr. G wyn Jeffreys, 

 is Aberdeenshire. 



Lacuna crassior, Mont. 



Littorina rudis, Maton. Drifted. 



litorea, L. Drifted. 



Rissoa punctura, Mont. 



striata, Adams. 



Turritella terebra, L. 

 * , var. nivea. 



, var. gracilis. 



Scalaria Turtonse, Tart. Living 

 in shallow water. 



communis, Lam. 



Trevelyana, Leach. Not un- 

 common in 40 fathoms, 30 miles 

 off Whitby. 



Odostomia rissoi'des, Hanley, var. 

 dubia. 



conoidea, Brocchi. 



unidentata, Mont. 



insculpta, Mont. 



interstincta, Mont. 



spiralis, Mont. 



rufa, Philippi, var. fulvo- 



cincta. 



acicula, Phil. 



(The paucity of Rissoa and 

 Odostomia from our dredgings 

 is somewhat remarkable. More 

 than a hundredweight of fine 

 material has been examined, the 

 result being only one or two 

 specimens of the foregoing. 

 Rksoa is scarcely represented 

 at all, not even by the ubiqui- 

 tous Rissoa parva.) 



Eulinia polita, L. 



distorta, Desh. 



bilineata, Alder. 



Natica islandica, Qmelin. Ex- 

 ceedingly rare, on hard ground, 



