26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Diagnosis: Abdomen with laminate crests visible in dorsal view. 

 Five anterolateral teeth diminishing rapidly in size posteriorly. Outer 

 suborbital lobe trilobed, inner sinus narrow. Outer slope of frontal lobe 

 continuous with preorbital lobe. Supraorbital teeth broad, truncate. 

 Merus of leg two with distal spine acuminate. Carapace 1.4 times wider 

 than long; a sinuous posterior line of tubercles. 



Description: Carapace considerably broader than long, depressed 

 and uneven; tubercles distinct, well separated, and tending to form 

 transverse ridges, especially on the cardiac region. Median pair of 

 frontal lobes moderately slender, compressed, acutely rounded, and sep- 

 arated by a deep fissure the size and shape of one of the teeth inverted ; 

 the outer two broad, little advanced, and separated from the median 

 pair by a shallow U. The sloping front forms a continuous, though 

 sinuous, line with the broad preorbital lobe which covers the eyestalk. 

 Middle supraorbital lobe granular, broadly truncate, separated from 

 the inner lobe by a deep, inwardly directed V-fissure and from the outer 

 lobe by a similar fissure less inwardly directed and half the depth. Outer 

 orbital lobe slightly more advanced than middle lobe, and not separated 

 from the large, blunt, and forwardly directed exorbital tooth. Antero- 

 lateral teeth five in number, excluding the exorbital, small and well 

 separated ; the first half the size of the exorbital, the second half the 

 size of the first, the remainder diminishing rapidly to the fifth, which 

 again is larger than the fourth, lobate, and at the lateral angle. Outer 

 slope of each tooth obtusely bent from outwardly directed at base to 

 inwardly directed near apex. Tubercles of carapace located as follows: 

 the four largest form an arc with a wide radius across the cardiac 

 region ; four smaller tubercles form an arc of smaller radius across each 

 mesobranchial region; a single tubercle occurs on each epibranchial and 

 on each hepatic region; two are located behind the front; nine occur on 

 the gastric region, of which two are epigastric; four at the level of 

 the first anterolateral tooth, a single median one just posterior to them, 

 and two opposite the third anterolateral tooth; a single median intesti- 

 nal tubercle, and a sinuous line of finer tubercles immediately above the 

 posterior margin. 



Lower margin of orbit oblique, divided by a narrow V-shaped sinus 

 into two lobes, the outer trilobed, granulate, the inner rounded, ad- 

 vanced, its base hidden by the broadly lobate pterygostomian process. 

 Merus of maxilliped with outer angle much produced, inner angle 

 less so. 



