3o6 STALK-EYED CRUSTACEA 



2. Acanthocarpus alexandri. 



Acanthocarpus alexandri . . . Stimpson. 



Surface of carapace concave, with five rows of tubercles 

 anteriorly, placed longitudinally, one in centre and two on 

 either side; posteriorly three ridges, the lateral terminat- 

 ing in the marginal teeth ; granules between the tubercles. 

 Lateral spine short and directed backwards. The posterior 

 margin is arcuate, with a protuberan'ce in middle; margin 

 outside orbit wavy for a short distance. Orbits large, with- 

 out fissures; margin toothed. Front not toothed, and separ- 

 ated from orbits by a projection, not a notch. Spine of fifth 

 joint of first pair of legs half the length of carapace, with a 

 second stout spine, not as long, at its base ; both are granu- 

 lated. Hand has a seven-toothed crest above and a six- 

 toothed crest on outer surface extending from the base of 

 fingers to postero-inferior angle ; other tubercles on surface. 

 Walking legs naked, unarmed, with smooth polished surface. 



Range. — St. Lucia, Grenadines. 



Family II. Matutidae. 



MatutidcE .... Dana, Miers. 



Afferent channels to the branchiae opening behind the 

 pterygostomian region, and in front of the first pair of 

 legs. The fifth and following joints of the external 

 maxillipedes are concealed by the triangular acute fourth 

 joint. Posterior legs normally developed. 



Subfamily Hepatinae. 



Hepatince .... Stimpson, Miers. 



Carapace with the antero-lateral margins arcuated. 

 Legs formed for walking, not for swimming. 



