468 



MR. G. S. BRADY'S MONOGRAPH OF 



{B. Lilljehorgii). In this single example (whicli, though I could not satisfactorily detect 

 the copulative organs, I must take for the male) the lower antennse show another 

 marked peculiarity, the shorter branch being much larger than in the female, and having 

 an elongated membranous terminal joint armed with two short setae, which is entirely 

 wanting in the female. This is shown in Lilljeborg's figure as well as in Baird's figures 

 of the same organs in Bradycinetus Macanclrei. In the individuals which show this 

 peculiarity the eye-pigment is also much deeper and of a red colour, whilst in the female 

 it is almost entirely absent." 



2. Bradycinetus Macandrei (Baird). (Plate XXXIII. figs. 14-17, and Plate XLI. 

 fig. 4.) 



Cypridina Macandrei, Baird, Brit. Entom. p. 179, tab. xxii. figs. 1 a-g. 



Carapace of the female, as seen from the side, subcircular, highest in the middle; 

 greatest height equal to more than three-fourths of the length ; superior margin arched, 

 sloping steeply in front, inferior boldly rounded ; anterior extremity produced into a 

 prominent beak, in shape much like a bird's head, which projects downwards and for- 

 wards, terminating in a sharp point, and bearing also at each side a long curved late- 

 rally extended process ; subjacent notch deep and rather narrow ; posterior extremity 

 subtruncate, bearing at its inferior angle a broad truncated and serrated spine. Out- 

 line, as seen from above, ovate, tapering to a point in front, broadly rounded behind, 

 greatest width in the middle, equal to half the length ; the two lateral curved processes 

 project conspicuously like horns in front, and the posterior spine forms a broad, deeply 

 emarginate mucro behind ; hinge-line flexuous, the left valve overlapping behind. The 

 notch appears broadly heart-shaped or subtriangular when seen from below ; from the 

 front it is hidden by the two horn-like processes. Surface of the shell finely punctate, 

 white, with clouded patches. Animal almost exactly like that of B. brenda; but the 

 filaments of the lower antennae are profusely plumose, and the secondary branch consists 

 of two broad joints, each of which has four setse springing from the middle of the ex- 

 ternal margin, and one from the apex ; that from the apex of the distal joint is long and 

 flexuous. 



Length ii^-j height 1-5- in. 2.k>^' X f,;^, 

 Hab. Dredged iii 70 fathoms, between the Islands of Lewis and Skye, R. M' Andrew, Esq. {Dr. Baird) ; 

 Oban, in mud, and at Cumbrae, amongst the fibres of Lima hians [Mr. D. Robertson). 



Fam. 2. C0NCH(ECIADiE. 



" Shell very thin and flexible, neither horny nor calcareous, but almost membrana- 

 ceous, more or less distinctly notched and emarginate in front, forming an orifice through 

 which, as in the preceding family, the lower antennae are protruded whilst swimming. 

 No eyes. Upper antennae, in the female, small, obscurely jointed, bearing at the apex 

 a brush of auditory filaments, in the male much larger and distinctly jointed ; between 

 the antennae is a very large tentacle directed forwards and dilated at the apex. Lower 

 antennae almost like those of Cypridina ; basal joint large and stout, natatory branch 



