Boone, Crustacea, Cruises of "Ara" and "Alva" 207 



rior margin and teraiinates posteriorly on each somite in a small 

 acute spine, which projects beyond the somite margin. These 

 spines on the posterior three somites become successively 

 stronger. 



The telson is shield-shaped, with a strong median keel, which 

 extends from the anterior margin to the posterior, bearing a 

 subterminal, blunt tooth, also a small, distal marginal tooth. The 

 posterior margin bears three pairs of large teeth, a submedian 

 pair, separated from each other by a series of small teeth, and 

 on the outer side, a series of small teeth ; next the paired, distal, 

 lateral, larger teeth, which on the outer side, form a thick, cari- 

 nate margin, separated at the base by one to three small denticles 

 adjacent to the large terminal tooth of the proximal lateral mar- 

 gin, which likewise forms a strong marginal carina extending 

 to the base of the telson. The uropod peduncle has a small acute 

 spine distally above the base of the outer blade, also three longi- 

 tudinal carinae, two marginal, and a median one, which is con- 

 tinued down the long inner process, to the apical spine, which 

 extends as far as the distal lateral spine of the telson; there is 

 also a similar, strong, ventral carina on this process. The inner 

 lateral margin of this process, which differs from that of Squilla 

 lata, is coarsely crenulate, not denticulate, almost to the apex of 

 the spine. Proximally on the inner side of this spine, the inter- 

 mediate, distal margin forms a small rounded node and thence 

 recedes to the base of the outer distal spine of the process which 

 is only about half so long as the inner spine and is heavily 

 carinate on the ventral side, this outer spine extending about as 

 far as does the narrowly oval distal inner blade. The outer blade 

 has the proximal portion with a strong median dorsal carina 

 and with the outer lateral margin carinate proximally and set 

 with nine, articulate, strong spines on the distal portion; the 

 distal blade is unequally ovate. Both distal blades are fringed 

 with long, web-like setae. 



The retrochela has the propodus armed with about six, spaced, 

 primary spines, along the inferior lateral margin, with about 

 one, occasionally two, half-so-long, secondary spines spaced be- 

 tween the primaries, also several smaller, acuminate spines, so 

 spaced. There are also a long and a short obliquely set spines 

 inset on the proximal end of the propodal margin. The dactyl 

 has its inner margin developed into eight strong, curved teeth, 



