162 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Strikingly from all these in having a more or less tuberculous, rugose 

 dorsal surface instead of a pitted and punctate one, as in the other species. 

 Either side of the prominent median carina are 6 or more longitudinal, 

 low, rounded rugae, anteriorly more or less tuberculous ; the tubercles 

 are somewhat longitudinally elongated, 2 rows more or less paralleling 

 the anterior end of the median carina, the other rows of tubercles ante- 

 riorly curve more or less toward the median line. The rugae may be 

 seen in even very small specimens, but the tuberculations do not appear 

 in specimens of less than 44 mm. in median length exclusive of the 

 rostrum ; even at this size occasionally one or two or very few tubercula- 

 tions may be observed ; at 47 mm. they increase in number and are plainly 

 to be seen. In the specimens of S. panamensis from off Petatlan Bay there 

 are one or two low, blunt tuberculations on the surface of the telson, but 



1 have not otherwise noticed any in the Bigelow material of S. panamen- 

 sis. The inner spine of the bifurcate process of the uropod is twice as long 

 as the outer, the lobular tooth on its outer margin is well marked; its 

 inner margin is serrate, not spined ; the basal segment of the exopod 

 carries 8 movable spines on outer margin. 



Color: In color pattern alcoholic specimens of S. hancocki and S. 

 tiburonensis are almost identical. The median carina is the mid-line of a 

 narrow, lanceolate area on the middorsum of the telson ; this area is much 

 darker marginally, and especially proximally where it forms 2 more or 

 less rectangular areas, one either side of the base of the median carina. 

 A pair of medially placed dark-colored or blackish roughly rectangular 

 areas are located on the dorsum of the 2nd, as well as the 5th, abdominal 

 somites. The somites from the 6th thoracic to the 5th abdominal inclusive 

 have dark-edged posterior margins. The distal end of the penultimate 

 segment of the exopod of the uropods is dark colored, as is also practically 

 the whole of the terminal segment or blade, except for a brief narrow 

 portion of the outer distal margin; not quite as much as the distal half 

 of the terminal blade of the endopod is also dark colored or blackish 

 all over. In tiburonensis the blade of the endopod is also distally blackish, 

 but the distal half of the blade is not wholly black, as it is traversed by 

 a longitudinal white or colorless strip. This occupies at least a fourth of 

 the width of the blade just inside the median line, and sometimes is even 

 wider than this. 



Remarks: In its rugose or ridged telson S. hancocki would appear to 

 approach S. rugosa Bigelow,^^ but except for this passing similarity the 



2 species are very distinct. 



42 Squtlla rugosa Bigelow, Johns Hopkins Univ. Circ, Vol. 12, No. 106, p. 102, 

 1893; Proc. U.S. Nat. Mus., Vol. 17, No. 1017, p. 541, figs. 23, 24, 1894. 



