CYPROIDEA. 



CONCHCECIA AG1LIS. 



1299 



Superne visa, elongate ovata, antice rotundata, postice fere acuta; latere 

 visa, oblonga, subrectangulata, antice paulo altior, f route instar rostri 

 prod/ucla, ■postice recte truncata, et angulo sujperno acute rectangulato. 

 Spicidum saggitto-capitatum. Pes mandibularis articido Mo valde 

 oblongo, recto, articulis sequentibus sensim attenuatis. 



In an upper view, long ovate, rounded in front, acute behind ; in a 

 side view oblong rectangular, a little higher anteriorly, front pro- 

 longed forward beak-like, straight truncate behind, with the upper 

 angle sharp rectangular. Spiculum sagitto-capitate. Mandibular 

 feet five-jointed, second joint straight and oblong, the following 

 gradually more slender. 



Plate 91, fig. 6 a, under view of animal, enlarged; b, side view; c, 

 ventral view, the shell open ; d, the anterior antennae, with d' the 

 spiculum between them ; e, mandibular feet. 



In the Atlantic, latitude 4° north to 0°, longitude 20° 10' to 17° 30' 

 west; latitude 0° to 6° south, longitude 17° 30' to 24° west; collected, 

 October 25, 26, 27, 29, and November 2, 3, 5, 8, 1838. Abundant. 



Length, one-twentieth of an inch. Colour, a little greenish. 



The anterior antennae when fully exserted, have the tips of the 

 setae extending forward to a distance greater than one-third the whole 

 length of the body ; but the apical joint scarcely projects beyond the 

 shell. The bases of these organs are situated together on a fleshy 

 mass, about one-third the length of the animal from the front margin. 

 The terminal setae are four in number, as described in our remarks on 

 the genus. 



The spiculum is very slender, but has an enlarged sagittate extremity, 

 with a subacute apex. Along the centre a longitudinal line was dis- 

 tinguished, which appeared to indicate that it was tubular. It 

 resembles in position, and possibly in function, an analogous organ in 

 the Argulus* 



* See Memoir on the Argulus Catostomi, by the author in conjunction with E. C. Herrick, 

 American Journal of Science and Arts, xxxi. 297, 1837. 



