PUGET SOUND CRUSTACEA. 275 



The specimen shows no traces of pigmentation. The dorsal 

 surface is flat or sHghtly concave, the ventral is convex and is 

 covered, except in the region of the abdomen, by the greatly de- 

 veloped brood-pouch. The dorsal swelling of the cephalic 

 region which marks the position of the stomach (ccphalogastcr), 

 is very slight. An irregularly oval, somewhat convex, area, the 

 " ovarian bosse," is marked off by a groove on each side of the 

 first four thoracic segments on the dorsal surface. 



The abdominal segments, six in number, are distinctly sepa- 

 rated from each other. The ventral surface of the abdominal 

 segments and of the last two or three thoracic segments is rough- 

 ened by longitudinal rugae, which are most marked on the adja- 

 cent margins of the segments. These rugae are neither so con- 

 spicuous' nor so regularly disposed as in the case of the allied 

 Palagygc borrei described by Giard and Bonnier (Bull. Scient. 

 Fr. et Belg., XIX, 68, 1888). The anterior margin of the head 

 is bordered by a narrow membranous expansion (linibc antcrieiir, 

 G. & B.), which shows a distinct notch and several fainter undu- 

 lations on each side of the middle line. No trace could be dis- 

 covered on the thoracic segments of the pleural lamellae, which 

 in PalcBgygc are said to be ** rudimentaires et a peine visibles." 



The antennules (inner antennae) are short, conical, composed 

 of three joints and bearing a few very minute setae at the tip. 

 The antennae (outer antennae) are composed of five joints, of 

 which the first is indistinctly marked off from the lower surface 

 of the head ; the third is longer and much more slender than the 

 second, the fifth is very minute. The mandibles, which are em- 

 braced by the upper and lower lips to form the characteristic 

 " beak" of the Epicaridca, are of the usual shape. The first pair 

 of maxillae appear to be absent. After a careful examination 

 we have been unable to find any distinct rudiments of them, 

 though the triangular areas between the base of the mandibles 

 and the lower lips on each side bear some resemblance to the 

 rudiments of these organs in PalcEgygc (Giard and Bonnier, 

 tom. cit., PL V, f. 2). The rudiments of the second maxillae 

 are to be detected further back on the under surface of the head. 

 Immediately in front of each a relatively large opening leads into 



