

RECENT BRITISH OSTRACODA. 



43:: 



lone simple setee ; lower antennae four-jointed, the third joint long and narrow; fla fol- 

 ium lone and Inarticulate. Mandibular palp three-jointed, bearing a distinct branchial 

 appendage. Lowest seta of the branchial plate of the first pair of jaws deflcxed. Feet 

 Ion 0, and slender, alike in male and female. Abdomen terminated by a hairy conical 

 process ; postabdominal lobes bearing two moderately long subequal setae. 



The genus is well characterized by the oblique "peach-stone " outline of the carapace, 

 and bv the very slender, setose but non-spinous limbs of the animal. The typical form 

 is well represented by the species described by Dr. Baird under the name Cythere im- 

 pressa, which is common both in a recent state and in the posttertiary formations of 



England, Scotland, and Norway 



• 



1. Loxoconcha impressa (Baird). (Plate XXV. figs. 35-40, and Plate XL. fig. 4.) 



Cythere impressa, Baird, Brit. Entom. p. 173, t. xxi. fig. 9. 



b a a v ■ *"^ m% t » ■ f "* A I -ft .^— r i _ 



flavida 



Nat 



5) p. 190, pi. ix. figs. 1-1. 

 Wissenschaften, Bd. vii. p. 656 (fidi 



Sars) . 



Loxoconcha rhomboidea, G. O. Sars ; loc. cit. p. 62. 



British type. D.str.bbt.on : Bwri-Uonny, Great Britain, Ireland, Bay of Biaeay. flmtf-Gbrial 



Nor 



Carapace of the female, as seen from the side, rhomboidal ; greatest height in the midd le 

 qual to two-thirds of the length ; extremities obliquely rounded, the posterior ohhquel, 



above the middle 



extremities; outline as 



5 



- 



--«— «„„ m — „, superior strongly arched, inferior sinuated in front of the 



middle, and prominently keeled behind*. Outline, as seen from above tumid, jndert » 



the middle, and tapering evenly to the extremities, which are sharply pmnted . 



equal to somewhat more than half the length. The shell o he m* m mu ch low u 



front than behind, the dorsal margin straight, and angular a fte anteno, ££»££ 



_ from above considerably less tumid than m the femal. . 

 Sar^Xn^red wi^a thick calcareous crust, and marked .«*** y .*» 

 pressed puneta, which are arranged in more or less regular con entn ro s. 



speeimen! bear in the intervals ^^^.^^^SX^i^SS^ 

 very feebly developed, intervening margin plated °*J£ hmwn ts . 



when oeeurring in tidal pools or amongst seaweed, marked w,th rati or lur J 



Upper antenme very slender; the ^^J^ZZ^^^^ 

 than the united lengths of the two following jo nts ^"™J Third joint of the 



eaeh bearing at its apex three or four very long slender <**■ J 



lower antenna, long and narrow, bearing two aeta ^ahore t ^ 



margin, and finely serrated below. Second joint f ' ^ P ^ anterior 



the conjoined length of the two following joints , last joint tmeiy 



* 



, r> • i A of the Nar") the anterior extremity of C cori/ia/a 

 In my paper (« Fossil Entomostraca from the Bnck-earth of the ) 



oneously described as the posterior, aud vice versa. ^ N 



is erroneously described as the posterior, and vice 



VOL. XXVI. 



