ORTMANN: CRUSTACEA OF SOUTHERN PATAGONIA. 647 



Locality. Punta Arenas, several hundred specimens, young and adult. 



Distribution. Falkland Islands ; Tierra del Fuego ; Straits of Magellan. 

 Shallow water. This species also has been reported from New Zealand, 

 Auckland Islands, Australia, and Kerguelen Islands. 



Remarks. Our largest individuals attain the length of about 25 mm., 

 by a width of about 15 mm. They all agree in the essential characters, 

 and represent the typical form of E. gigas, as described and figured by 

 Stebbing, with the only exception that in Stebbing's figure of the whole 

 animal (pi. 39) the outer ramus of the uropods is broader than in our 

 individuals, in which it is distinctly narrower, the end being sometimes 

 subacute, sometimes rounded. In this respect, our specimens correspond 

 better with the figure given by Dollfus, yet Dollfus says that there are 

 variations in this respect. 



EXOSPIL-EROMA LANCEOLATUM (White). 



1843 Sphceroma gigas var. lanceolata White in : Ann. Nat. Hist., ser. i, v. 



12, p. 345- 



1891 S. calcarea Dollfus in : Miss. Cap Horn, v. 6, p. 64, pi. Sa, f. 7. 

 1900 Exosphceroma gigas (pro parte) Stebbing in: Pr. Zool. Soc. (only 

 single individual described on p. 557). 



Localities. Mouth of Santa Cruz River, i smooth, 14 sculptured speci- 

 mens ; San Julian, 3 smooth, 2 sculptured specimens. 



Distribution. Falkland Islands and Tierra del Fuego (region of Cape 

 Horn). Shallow water to 95 m. 



Description. This species differs from the foregoing in the following 

 particulars : 



1. In the smaller size. While E. gigas attains 25 mm., Dollfus gives, 

 for this species, only 12 mm., and our largest is 14 mm. White gives 

 % to i inch (18-25 mm.), but these measurements apparently include 

 E. gigas. 



2. In the epimera of the peraeon-segments, which are abruptly bent 

 down, so as to form a sharp angle with the middle of the back, which is 

 sometimes cariniform. This character is very important, and never found 

 in E. gigas. 



3. In the sculpture of the posterior peraeon-segments, of the pleon and 

 telson. This sculpture varies considerably, but in E. gigas there is no 

 sculpture at all. 



