222 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Nobili's Statement that the spinules arming the crest atop the sub- 

 median teeth of the telson are arranged in a double series very definitely 

 sets his species apart from its Pacific congeners. In all but 3 (about 17 

 mm. in median length exclusive of rostral plate) of the specimens of 

 G. festae taken by the Hancock Expeditions these spinules, numbering 

 from 2 plus 2 nodules to 8 or 9 spinules, are arranged in 2 rows. In one 

 of the 3 exceptions noted one crest has 7 spinules in a more or less triple 

 series, the corresponding crest has 4 in 2 rows; the 2nd specimen has 3 

 spinules and a nodule in 2 rows on the one side and 5 spinules, apparently, 

 in one row on the other; the 3rd specimen has 2 spinules in a single row 

 on one crest, and 4 in 2 rows on its mate. In the Atlantic oerstedii var. 

 spinulosus the spinules on these crests usually seem to be organized into 

 3 rows, the total number of spinules on either crest running from 5 to 7. 



The accessory carinae in G. festae are usually armed with 4 to 7 

 spinules in a row, most often 4 or 5, rarely 2 or 3 plus a nodule or two; 

 only in one instance (one carina) is there one spinule plus 2 nodules. 



The knob forms a coronet armed with from 4-7 spinules or prickles — 

 in general, prickly is the characterization one instinctively gives a G. 

 festae telson. Its near relatives may have the telson spined or spinulose, 

 but in G. festae, in well-developed specimens, it is definitely prickly 

 looking, only in a very few of the smaller specimens are just a few 

 prickles observable, but in these specimens the characters otherwise are 

 unmistakably those of G. festae. 



The submedian carinae of G. festae (s.s.) never seem to get beyond 

 the anchor-fluke stage, not very long flukes at that, and very much con- 

 fluent with the hinder end of the median carina. The anchor, submedians 

 plus the median carina, is armed with 5 to 9 spinules, rarely and per- 

 haps only abnormally less. There are also one or more little prickles, or 

 indications of them, on either side of the median carina in advance of 

 the anchor. 



The intermediate carinae of the telson almost without exception end 

 in a little patch of from 3 to 6 spinules or prickles in 2 or 3 short rows, 

 just a patch of them as it were; only in some of the smallest specimens 

 are there fewer of these tiny spinules. 



Just inside the lateral tooth or lobe of the telson typically there is 

 inserted next to the lateral margin of the telson a small but readily 

 observable spinule. In the largest specimen the lateral lobe is wanting on 

 the left side, and the spinule is wanting within the lobe on the right 

 side; in only one other specimen of G. festae (s.s.) is the lateral lobe 



