392 



MR. G. S. BRADY'S MONOGRAPH OF 



Maceocypris MINNA (Baird). (Plate XXVII. figs. 5-8, and Plate XXXVIII. fig. 4.) 



Bairdia minna, Saxs, Oversigt af Norges mar. Ostrac. p. 21. 

 Cythere minna, Baird, Brit. Eatom. p. 171, tab. xx. figs. 4, 4c!-c?. 

 Scandinavian type. Distkibtjtion : Recent — Norway, Shetland. 



Carapace rather tumid ; seen from tlie side elongated, subtriangular, rounded in front, 

 acutely pointed behind ; greatest height near the middle, equal to two-fifths of the 

 length. Dorsal margin much arched, highest in the middle, thence sloping with a 

 gentle curve forwards, hut steeply behind, where it joins the ventral margin at an acute 

 angle. The ventral margin is slightly sinuated in front, and runs backwards in a right 

 line to the posterior extremity. Outline, as seen from above, ovate lanceolate, sharply 

 pointed behind, more obtusely in front ; greatest breadth in front of the middle, equal 

 to more than one-third of the length ; line of junction of the valves waved. End view 

 subcircular; height rather greater than the breadth. Surface perfectly smooth and 

 polished, white, the animal itself deep brown. " Antennae short and robust, fourth 

 joint of the upper about equal in length to the following joint ; sixth joint of the 

 lower antennae shorter than the fifth, terminal claws very long and subequal. Mar- 

 ginal spines of the palp of the second pair of jaws minutely dentate. Second joint of the 

 first pair of feet much shorter than the united lengths of the two following ; last joint 

 moderately long, armed with a short seta and two unequal claws, one twice as long as 

 the other. Margins of the terminal claw of the last pair of feet shortly and densely 

 pilose. Postabdominal rami forming two appendages springing from a common base, 

 bearing on the middle of the posterior margin a small brush of hairs, and at the apex 

 a long seta. Copulative organs of the male laminar, obtusely subtriangular." 



Length -^q in., height in. .. .^ /.\. 

 Hub. " Dredged in from 80 to 90 fathoms of sand, twenty miles east of the Noss in the Shetland Isles, 

 R. M' Andrew, Esq." {Dr. Baird). 



The only British specimen of this species which I have seen is in Mr. Norman's col- 

 lection, and was dredged in Shetland. M. minna occurs also on the Norwegian coast ; 

 and I am indebted to Hr. G. O. Sars for Norwegian specimens, from which I have 

 been able to verify most of the details of his description of the animal above quoted. 

 In the British seas the species is excessively rare, but on some parts of the Norwegian 

 coast, according to Sars, is tolerably common, ranging from 20 to 800 fathoms : it is 

 quite destitute of swimming-power. 



