234 Description of a Species of Caligus. 



if we may so call it, there are several folds seen below, (fig. 17,) 

 which may be the seat of the sense of taste. Above we observe, 

 (fig. 12,) four fleshy oblong organs extending from a point deeply 

 situated near the base of the esophagus, obliquely upwards to the 

 upper part of the buccal mass. At their lower extremity, they 

 are connected by a slender ligament with the bone, g. These 

 organs appear to close the esophagus. They often open and close 

 in consequence of the similar action of the processes, g, with 

 which they are connected. 



The articulation of the buccal mass with the surrounding parts 

 is formed by means of a bony process situated in it below f, and 

 another slender process (h, figs. 12 and 17,) extending backward 

 and outward in the adjacent teguments. A curved bony process, 

 (i, fig. 13,) connects the projection c (figs. 17^ 13,) with the pro- 

 cess below f, uniting the two portions of the buccal mass. 



The remaining organs of the cephalic segment consist of four 

 pair of feet, corresponding to the second pair of maxillas and the 

 three pairs of maxillipeds in the decapodous Crustacea. 



^he first pair are three-jointed. The basal joint is broad and 

 oblong, and is connected with the body by its long posterior side. 

 At its inner extremity, which is directed outward nearly parallel 

 with the basal, it curves upward and receives the following joint. 

 The two terminal joints are very different in the two sexes. 

 In the male, (fig. 1,) the second joint is large and subconical, 

 with an obliquely truncated apex. It appears to be composed of 

 two joints, but there is no articulation. The terminal joint is 

 obliquely articulated with the preceding ; it is small and short, 

 and terminates in two strong curved spines, occupying like horns 

 the lateral portions of the apex. A slender seta is situated on the 

 outer margin, and another on the inner surface near the articula- 

 tion. The exterior of the apical spines is often brought in con- 

 tact with a prominence on the apex of the preceding joint. In 

 the female, (fig. 18 and 18 a,) the second joint is large, but scarcely 

 longer than its breadth. The terminal joint gradually tapers with 

 an irregular curve to a pointed corneous extremity, which is bent 

 downward at right angles with the preceding part. The basal 

 joint is peculiar in having a stout spine directed backwards, on its 

 posterior margin. 



Exterior to the. outer portion of the basal joint of this leg, there 

 is a large hooked spine, arising from a broad base, and having an 



