DREDGING IN THE MORAY FIRTH. 211 



slightly sinuous. Seen from above the outline is oblong, subquadrilateral, 

 obtusely pointed in front, truncate and mucronate behind. Surface irregu- 

 larly -waved ; a conspicuous rib parallel to the ventral margin, which gives 

 off in front of the middle another ridge running toward the anterior hinge, 

 which again sends forward from its middle a short longitudinal rib. Length 



BtTHOCTTHEEE ? FLEXTJOSA, n. sp. 



Elongated, compressed, siliquose ; greatest height in the middle, equal to 

 about one-thir-d of the length. Superior margin arched, sloping steeply do^vn- 

 wards in front, more gently behind. Extremities obtusely pointed. The 

 ventral margin slightly concave in front, then curving upwards to the poste- 

 rior extremity. Seen from above compressed oval, widest in the middle, 

 and tapering equally to the extremities, which are somewhat mucronate. 

 Surface smooth, i)ellucid, with white clouded patches. Hinge-processes 

 feebly developed. Length -^ in. 



Hcib. The Minch, 45-60 fathoms. 



Ctthetiella ScoTicA, n. sp. 



Elliptical, equal in height throughout, height equal to nearly two-tliirds 

 of the length ; right valve considerably larger than the left ; anterior and 

 posterior margins obliquely rounded, superior and inferior margins nearly 

 ])arallel, gently siuuated in the middle. Outline, as seen from above, sub- 

 conical ; greatest width at the posterior extremity, equal to less than half 

 the length, obtusely rounded, and emarginate in front, rounded behind. 

 Surface marked with very small punctte. Length yL in. 



JIab. The Minch, 45-60 fathoms. 



CtTHEEELLA LiEVIS, U. Sp. 



Valves elliptical, broader in front than behind, greatest height equal to 

 two-thirds of the length, broadly rounded in front ; rather narrowed, and 

 oblifpiely rounded behind; dorsal margin gently arched, sloping steeply 

 behind;" ventral margin straight, or very shghtly incurved. Seen from 

 above the valves are compressed, broadest at the posterior third, and rounded 

 at each extremity ; smooth, opaque-white. Length -Jy in. 



Hab. The Minch, 45-60 fathoms. 



Only two detached valves of this species were found, but they are suffi- 

 ciently distinct from C. Scotka, the only other British species, to require 

 separate description. 



Report on Dredging in the Moray Firth. 

 By the Rev. Walter Macgregor and Robert Dawson. 



The Committee appointed by the British Association for the Advancement 

 of Science for dredging the Moray Eirth engaged the same vessel as they 

 did last year, and sailed from Macduff on the 13th of July. They contmued 

 at sea for fifteen days. During the whole time the weather was most im- 

 favourable, and in consequence the dredgings were in a great measure con- 

 fined to the western part of the Eirth. So stormy was_ the weather on the 

 18th, that the vessel was obliged to run into Cromarty Eirth. 



In the Eeport laid before the Association at their Meeting of 1865, the 

 number of MoUusca belonging to the district was set down at 259. Smce 



p 2 



