Boone, Crustacea, Cruise of "Alva," 1931 



65 



A 



B 



Text figure 1 — Panulirtis ornatus (Fabricius), A, dorsal surface of rostral 



segment, showing two pairs of spines ; B, anterior margin of sternal plate, 



showing the median spine, which is dorsally visible. 



The antennulae arise immediately below the rostral segment 

 and have the proximal article as long as the precervical portion 

 of the carapace, slender, smooth, cylindrical, but curiously en- 

 larged proximally ; the second article is three-fourths as long as 

 the first article ; the third article is two-fifths as long as the sec- 

 ond ; the two-branched flagellum has the shorter branch one and 

 one-third times as long as the peduncle with a fine brush of setae 

 on the distal third ; the longer branch is one and one-half times 

 as long as the peduncle, slender, tapered. 



The strong apical or median spine of the sternal plate is visi- 

 ble dorsally, projecting between the basis of the antennulae. This 

 plate has, in addition to the median large spine, a smaller but 

 strong submedian pair of spines, one each placed just outside of 

 the antennular peduncle margin. 



The antennae have the peduncle articles greatly developed, 

 laterally compressed and armed along the anterior and posterior 

 lateral margins, the distal margins of the respective segments 

 and at other strategic points on the upper and lower surfaces with 

 coarse, strong, out-jutting, acuminate spines. The flagellum is 

 also strong, two and one-third times as long as the entire body, 

 thick and ridged for the proximal half of its length, laterally com- 

 pressed and armed with numerous sharp spinules set in longitudi- 

 nal series, also with a fine short brush of setae on the outer lateral 

 margin. 



