142 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



B2. Raptorial dactylus with more than 4 teeth. 



Anterolateral angles of carapace spined or at least sharp angled. Lat- 

 eral process of 5th thoracic somite a sharp, laterally directed spine; 

 also a pair of ventral spines. 



G^. Cornea set very obliquely on eyestalk. 



Raptorial dactylus with 7 to 9, rarely 6, teeth. Lateral margins of 

 6th and 7th thoracic somites drawn out at posterolateral angle into 

 a sharp, backwardly directed spine. Submedian carinae present on 

 all abdominal somites, posterior margin of 5th somite either side 

 between submedian and intermediate carinae armed with from 

 1-4 spines grouped together (found only in this species). Denticles 



0, 1-11, 1. Submedian teeth of telson with movable tips 



armata, p. 150 



G^. Cornea set more or less transversely on eyestalk. 



Raptorial dactylus with 8 to 10 teeth. Lateral margins of 6th and 

 7th thoracic somites rounded. No submedian carinae on somites 



anterior to 6th abdominal. Denticles 18±, 13±, 1 



gracilipes, p. 151 



A^. Carapace with well-marked median carina; intermediate and lat- 

 eral carinae present; anterolateral angles spined, at least in 

 larger, adult or mature specimens. 



Submedian carinae present on all abdominal somites. Prelateral lobes or 

 angles of telson at least indicated, usually well marked, spined or un- 

 armed. 



B^. Lateral margin of 5th (first free) thoracic somite, seen in dorsal 

 view, composed of 2 prominent, distinct processes, a more or 

 less antrorse anterior spine and a rounded posterior lobe, no 

 ventral spines, lateral margin of 6th and 7th somites rounded, 

 entire, not bilobed. 



Cornea set more or less transversely on eyestalk. Raptorial dactylus 

 with 5 teeth. No trace of mandibular palp. Epipodites on the first 4 

 thoracic limbs. Submedian carinae on 5th and 6th abdominal somites 

 posteriorly spined. Denticles 3, 10, 1 hildebrandi, p. 152 



B2. Lateral margin of 5th thoracic somite, seen in dorsal view, com- 

 posed of a single process, spinous or subacute, or of one or two 

 low, inconspicuous lobes ; also a pair of ventral spines scarcely 

 or not visible in dorsal view. 



Mandibular palp present, except, in some cases at least, in small 

 specimens. 



