Boone, Crustacea, Cruise of ''Alva," 1931 15 



The outermost pair of tubercles is also triangulate but has the inner 

 lateral margin elevated with a ridge-like carina and the apex is more 

 acuminate. The telson has a narrow transverse carina across the 

 proximal margin in the median area terminating in a wide triangulate 

 node outside of and near the base of the outermost carina on the dome- 

 like, proximal portion of the telson, this dome being further orna- 

 mented by five long, longitudinal carinae, the median one of which 

 is the widest and most elevated and terminates posteriorly in an acute 

 spine, the end of the carina below the base of this spine being exca- 

 vate; the next, or submedian pair of carinae are thick, but not so 

 thick as the median carinae and are shorter, terminating posteriorly 

 in a similar distal spine, with a slight excavation below it ; the next, 

 or outer pair of carinae on the dome are subcarinate dorsally, curved 

 a little and terminate distally at a point opposite the apex of the ad- 

 jacent inner carinae, but do not have a distal spine. Beyond the third 

 pair of carinae and completing the curvature of the dome distally are 

 a pair of small, short, rounded nodes. The distal margin of the telson 

 is deeply incised by a median triangulate sinus, on either side of which 

 there is a long, triangulate tooth, emphasized by a strong median 

 dorsal carina, throughout its length; the inner lateral margin of the 

 tooth is set with articulate denticles and a larger articulated spine 

 occurs at the apex of the tooth ; the outer lateral margin is smooth 

 and two incisions near its base define a small rounded tooth, that has 

 an articulated spine at its apex; just outside of this there is another 

 large triangulate tooth, with smooth, slightly sinuate convex lateral 

 margins and an acute apex ; a strong median longitudinal carina that 

 extends backward, almost to the proximal margin of the telson. A 

 slight incision on the outer side at the base of this tooth separates it 

 from the acuminate tooth at the apex of the carina of the outer lateral 

 margin, which extends back to and widens toward the proximal mar- 

 gin of the telson. On its ventral surface this telson has a median 

 carina and a pair of submedian carinae the length of the large teeth. 

 The uropoda have a spine at the upper distal angle of the pedun- 

 cular article above the base of the outer branch; the produced inner 

 process curved inward, directed backward, bifurcate by a deep 

 V-shaped sinus, on either side of which is an acuminate triangulate 

 tooth, the inner one a trifle shorter than the outer, the outer extending 

 about as far backward as does the apex of the longest teeth of the 

 telsonic margin. The inner branch of the uropoda is as long as the 

 telson, narrowly oval, with a heavy dorsal carina just above the nearly 



