2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



In order to avoid repetition I give below a list of the localities con- 

 cerned with this paper, as follows : 



Order MYSIDACEA 

 Suborder Lophogastrida 



Family LOPHOGASTRIDAE 

 PARALOPHOGASTER HANSEN, 1910 



In an earlier paper (Tattersall, 1926) I recorded Paralophogaster 

 glaber fr®m six stations in the Western Atlantic, pointing out certain 

 characters in which the specimens differed from Hansen's description 

 and figures (Hansen, 1910). I have now to record a further series of 

 specimens from practically the same area which show the same small 

 differences from the type form. It is obvious that these differences 

 are constant for the area under notice, and the question now arises 

 whether they are to be considered as of specific rank. 



Colosi (1930 and 1934) has described three new species of this 

 genus from the Red Sea, P. soiicoi, P. micro ps, and P. macro ps. These 

 species are separated from the type on characters of precisely the same 

 order as the differences I have pointed out as existing between the 

 Atlantic specimens already referred to, and P. glaber as described 

 by Hansen, namely, the proportions of the antennal scale, the form 

 of the rostral plate, and the details of the armature of the telson. In 

 P. microps the size of the eye is the main specific difference. 



