no. 1480. SCHIZOPOD CRUSTACEANS— ORTMANN. 37 



gigas (see Plate II, fig. la, taken from a small individual, 56 mm. long, 

 Station No. 3329), it is rather indifferent in shape, the two tips being 

 widely separated by a very shallow incision; the two halves are not 

 completely united in the median line. In larger individuals (see my fig. 

 17) on Plate II, taken from an immature female about 90 mm. long, Sta- 

 tion No. 2741) the tips are produced almost to the posterior margin of 

 the segment, are more closely approached, and separated b}^ a narrower 

 and longer incision. This incision, however, is wider than in speci- 

 mens of corresponding size of G. calcarata, and the tips on both sides 

 are simple, not bifid as in G. calcarata. However, Sars in his fig. 5 on 

 Plate III draws an accessory terminal spine on the outer side of the left 

 tip, while the right tip is entire. In our specimens I have never seen 

 a condition like this. Our largest individual (Station No. 2860, 119 

 mm.) has the epimeral plate similar to that shown in our fig. lb on 

 Plate II, but it is slightly shorter and the outer margin is more evenly 

 rounded, not angular, as in the latter. 



The characters given under 1, 3, and 1 are most important, and 

 according to my experience always hold good. Characters 2 and 5 

 are not so reliable, although they may prove to be of some help. With 

 regard to the relative length of the rostrum and the spines of the 

 carapace, again the fact will have to be stated that they all are com- 

 paratively longer in young specimens, as I have already pointed out. 

 The epimeral plate of the sixth abdominal segment, although different 

 from that of G. calcarata, is not very reliable on account of the 

 marked changes in shape taking place during development. 



Our largest specimen (Station No. 2860) is 119 mm. long; and is a 

 female with the marsupial pouch fully developed. Sars's specimen 

 was a male, 112 mm. long. Our second largest individual (Station No. 

 2741) is an immature female about 90 mm. long, with small, but dis- 

 tinct marsupial lamellae, which do not form a " pouch." All other 

 specimens that have come under my observation are much smaller; 

 the one from Hawaii is 50 mm., another from Sitka Sound, Alaska, (to 

 be described elsewhere) is 55 mm. long, and the present young one 

 from Station No. 3329 is 56 mm. long. They have no traces of marsupial 

 lamellae, and have been regarded by me as males. But I am not quite 

 sure as to this point. They may be young females. The two speci- 

 mens from Station No. 3310 consist of two badly damaged carapaces 

 with remnants of the trunk, while in both the abdomen is entirely 

 missing. However, they undoubtedly belong to this species, since 

 characters 1 and 3 are clearly observable. 



