772 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol.. XXIII. 



CANCELLUS ORNATUS, new species. 



The ro.stral projection is ;i hioad triiing-le with a rather l)hint apex; 



the .sinu.s on either side ])eirm(l the eyes is deep and evenl}^ rounded; a 



broad raised collar extends from the outer limit of one to the outer 



limit of the other sinus; 

 from these points to the 

 antero-lateral angle the 

 margin is straight and 

 transverse, giving the en- 

 tire front a transverse 

 effect. The eye-stalks are 

 slender and reach to the 

 ope rculating facets; in the- 

 distal half of their length 

 they are straight and 

 nearly in contact; in the 

 proximal half the}- are 

 spreading. 



The peduncles of the an- 

 tenniilw I'each the cornea. 

 The peduncles of the an- 

 tennt\? extend to al)out the 

 middle of the eye-stalk; 

 the llagellum is small and 



short, extending a little if any beyond the distal margin of the carpus. 



The acicle of the antenna is short, stout, and subdiamond-shaped; three 



stout but short spines arm the outer and one the inner margin. 



The anterior portion of the carapace is much broader than long, and 



is strongly arcuate at the sides; a transverse 



sulcus runs along just behind the collar or 



carina of the frontal margin, broadening out 



into a diamond-shaped depression behind the 



rostrum and a triangular depression behind 



the sinus. 



The exposed surface of the car|)us of the 



(•h(>lipeds forms a deeply excavated facet in 



the plane of the palm; the excavation forms a 



part of a channel, which extends to the base of 



the fingers. The raised margin of the carpus 



is thin and thickl}' set with spiny granules; the 



margins of the palm are much thicker and the granules are not so spiny 



in character; the inner margins of the palms are straight; between 



this contact margin and the channel the raised surface is divided into 



lobes by transverse cuts; each lobe is crowded with large granules. 



Fig. 1. — Cancei.lvs oknati's. 



Fig. 2.— Operculum of Canxel- 

 lus ornatus. x 3^. 



