108 Bulletin Vanderhilt Marine Museum, Vol. V 



outer angle which is produced and deflected, bordering the anten- 

 nulary fossett and touching the distal angle of the antennal peduncle. 

 Immediately above the frontal margin are a pair of convex lobes, 

 flanked on each side by the orbital lobe, which, in a dorsal view, ap- 

 pears to be the frontal margin; immediately behind the submedian 

 pair of lobules is a second pair of similar lobules ; those of the frontal 

 region are low, rounded, in comparison with those of the transverse 

 series across the gastric region and separated by a deep sulcus, which 

 combine to give the carapace an odd sort of humped appearance. The 

 orbital margin is thickened, circumscribed, cut on the outer half by 

 two closed sinuses, the outer angle is a rounded small lobule closely 

 related to the first anterolateral lobule, which is also a rounded lobule. 

 The anterolateral margin is cut into four rounded convex lobules, 

 which gives it a scalloped aspect. The second and third of these 

 lobules are subequal, larger than the first and the fourth lobule is 

 small, subequal to the first. Including and approximately in line 

 with the second anterolateral lobe there are five lobes in transverse 

 series on each side of the carapace, two lobules being on the epibranchial 

 region and two, slightly larger, oval ones on the mesogastric region, 

 separated by the pointed apex of the anterior lobe of the metagastric 

 region, from the two similar lobes of the opposite half of the series. 

 Three oval lobes, the anterior of which is the smallest, summit the 

 mesogastric region; in a curved line with these across the meso- 

 branchial region is a series of four lobules on each side, the inner two 

 being subequal and much the larger; the outermost one being the 

 third anterolateral lobule. On the circumscribed cardiac region there 

 are two partially united lobules, which together have a heart-shaped 

 contour and on either side of these in curved series along the post- 

 lateral margin are five small lobules, the second (from the center), of 

 which is quite small, the outermost lobe being the fourth antero- 

 lateral lobule. Across the posterior region of the carapace is a trans- 

 verse ridge, composed of three semiunited lobules. In all there are 

 44 lobules on the dorsal surface. The pterygostomian region is 

 smooth. The female belt is oval, setae fringed, seven segmented. The 

 sternal plastron is smooth. 



The eye is small, the stalk calcareous, constricted medially and with 

 its distal margin granulose; the cornea is rounded, set obliquely 

 terminal with almost all of the dorsal surface covered by the calca- 

 reous stalk, the field of vision being principally from the distal and 

 under surfaces. 



