RECENT BRITISH OSTRACODA. 



KiO 



bearing long plumose setse, secondary branch short and, in the male, prehensile. Man- 

 dibles distinct, narrow, dentate at the apex : palp large, pediform, geniculate, four-jointed ; 

 basal joint very large, produced at the base into a dentate process which stretch. » beyond 

 the apex of the mandible, last joint armed with elongated claws. Two pairs of jaws; 

 first pair composed of three lobes, the external lobe or palp large, Particulate, and 

 incurved ; second pair provided with a small branchial plate and an elongated rabpedi- 

 form palp. Two pairs of feet ; first pair elongated, five-jointed, bearing at the base, like 

 the second maxilhe, a small branchial plate, dissimilar in the male and female ; second 

 pair very small and rudimentary. Postabdomen forming two short clawed lamime." 



I have had uo opportunity of properly examining any of the animals belonging to this 

 family ; and, indeed, its sole claim to admission here rests at present on a single .individual 

 taken in Shetland by the Rev. A. M. Norman. The definition given above is taken rom 

 the work of G. O. Sars, who describes three species of Con^cu, which appear <o U 

 not uncommon on the Norwegian coast, where they are met with either in great depths 

 of water (100-300 fathoms) or swimming near the surface in the open sea. 



Genus Co> t chcecia, Dana 



mall 

 La 



"Valves elongated, produced infront into a beaked process; she! ^« Ct 

 marked with concent «. ; very slightly ^J^^»JZ ZZ^ 

 tened in front, sometimes slightly excavated "^^J ai , iculated , beari „, * 

 small, scarcely protruding beyond the she, mnmtole ob ^ 



the apex four large auditory cilia and a seta to* >m g^ J ^ rf ft( 



denticulated ; in the male ^^^^SSXm of the female Lowe, 

 apical setae much elongated, and differing to JJ" a]ling half the 



antenna very powerful, basal portion elongate-tnan u , ^ ^^ ^ ^ 



length of the shell; natatory branch seven -tojl ^ ^^ ^ v „ y sma ; 



rest united, secondary branch Inarticulate, test j ^ ^ ^ ^ ^ 



bearing, in the female, several sl *^ ual ^ amed at the lower extremity with a 

 brum large, produced like a hood. Alanairae ^ ^^ _ palp robust, scarcely 



strong tooth and a semicircular, flexuous, and hne y ^ ^ ^ Qf & branchial 



projecting beyond the valves ; basal joint bearing ■ ne ^— ^^ ^ ^ ^ 

 appendage, a densely ciliated seta; last joint on i •_ ^ rf , w0 stron „i y sp i ne d 

 and finely toothed claws or spines. First pan o > ^.^ fa subovate , and set with lone 

 incisive lobes and a large palp, the first join o^ ^^ incur ved, armed with several 

 setae on the anterior and posterior margins; ie ^V; ve part of the second pair of 

 curved claws, which increase in length inwau J-^^ lamilia small; thrcc-lob. .1 ; 

 jaws scarcely lobed, strongly spined at the apex, ^ ^ aM arm ,. d will , 



palp elongated and directed forwards, three-join , ^^ ^ ^ ^ a threc ..i bcd 

 three unequal claws. First pair of feet nie-jo the ' female "narrow, directed forwards, 

 branchial plate as in the second pair of jaws , ^ much stron?e r nnd 



1 . ... *!._„ »lnn?ateu claws, , 



and armed at the extremity with three elongai^u ^ ^^ ^ which ^ curved 



stretched backwards, terminate 



three very iou^ 



