SCHIZOPODA, STOMATOPODA, AND NON- ANTARCTIC ISOPODA. 201 



Tribe EPICARWEA. 



Family BOI-YRID.K. 

 Genus Probopyrus, Giard and Bonnier. 



Probopyrus latreuticola (Gissler). 

 Scotia. 



Station 538, lat. 32 11' N., long. 34 10' W., tow-net. Eight, from 

 Latreutes ensiferus, captured among tbe Gulf weed. 



Family DAJIID.E. 

 Genus Heterophryxus, G. 0. Sars. 



Heterophryxus appendiculatus, G. 0. Sars. (Plate, figs. 14 and 15.) 



H. appendiculatus, G. 0. Sai's, 1885. 

 Scotia. 



Station 39, lat. 6 43' N., long. 25 48' W., tow-net. One female, with 

 attached male, free in a tow-netting containing many Euphausia 

 americana, Hansen. 



Station 512, lat. 22' N., long. 18 43' W., tow-net. One female, with 

 attached male, from Euphausia americana. 



It is almost certain that the specimen from Station 39, found unattached, was 

 originally parasitic on Euphausia americana, of which there were over one hundred 

 specimens in the same gathering. Thus both specimens in this collection were from 

 the same host. 



These specimens differ from those described and figured by me (1905) from 

 specimens taken from Euphausia Krohnii in the form of the last pair of legs. 

 I figure on the Plate these limbs from one of the present specimens (fig. 14) and 

 from a specimen taken in the North Atlantic to the west of Ireland (fig. 15). 

 It will be seen at once that, in the specimens from E. americana, the inner branch 

 of these peculiar appendages is shorter and stouter than in the specimens from 

 E. Krohnii. These figures illustrate incidentally the most frequent position of the 

 limbs in preserved specimens. I cannot decide at present whether this difference 

 is of specific value. In the first place, the host of the type specimen must be 

 considered uncertain, in the light of HANSEN'S recent work. It was called Euphausia 

 pellucida by SARS, but HANSEN has shown that SARS confused several distinct species 

 under that name. The host of the type specimen was taken in the North Atlantic, 

 near to Cape Verde. This is just the locality given by HANSEN for E. americana, 

 and though there is no improbability that the specimen is a true A'. Krohnii, it is 

 more probable that it is E. americana, the same species from which the present 

 specimens were taken. I have examined the type host and parasite in the British 



(ROT. soc. EDIN. TRANS., VOL. XLIX., 891.) 



