948 DR... J. HANSEN ON CRUSTACEANS [Dee. 1, 
(p. 217), must be mentioned ; for in the final report, 1595, he with- 
draws it “as large and mature individuals of S. edwardsii,” 
redescribing and figuring one of the three type specimens as this 
species (p. 212, pl. li. figs. 1-1e). But his representation shows 
that S. halia, Fax., must be maintained as valid, as the exterior 
margin of the ext. br. of urp. is naked in almost 3 of its length, 
while in S. edwardsi, Ky., it is hairy in the total length ; further- 
more, the rostrum, besides being somewhat differently shaped, is 
considerably shorter in the last-named species than in S. hala, 
Fax., a feature also observed by Faxon (p. 214). When he writes 
(p. 214):—* Kroyer notes a ‘rare variety’ of S. edwardsi, dis- 
tinguished by a larger rostrum,” I may remark that a preserved 
specimen of this variety belongs to another species, S. penerinkt, 
Bate, H. J. H. 
As to this last name and some other names in the following 
chapter I must say a few words. When an author in the same 
work has described an adult species and ..s Mastigopus as two 
species, the species, of course, retains the name of the adult. But 
in some instances only the Mastigopus has been described, while 
I also possess and briefly describe “he black-eyed or even the 
mature form. In order to avoid new names I, in these cases, have 
used the name of the Mustigopus for the adult Sergestes, thinking 
that a double series of names, one for one of the not few Masti- 
gopus-stages, and another for the adult species itself, cannot be 
maintained, as the Mastigopus and the Sergestes—in strong 
contradistinction to the relation between the Squillide and their 
larvee—are connected with even transition. To avoid misappre- 
hension I, in these cases, have placed my own name (H.J.H.) 
after the name of the author who has established the MJastigopus. 
Tt will, I fear, in the future also be necessary to adopt the oldest 
name for a species when its Mastigopus has been described before 
the adult. 
v. Conspectus of the Species. 
In the following tabular view (and added notes) all established 
species are enumerated, and besides two new species are named 
and later on described. The tabular view is worked out with 
reference to the adults and the Mastigopus-stages, with the ex- 
ception of the youngest Mastigopus-stage (in several instances= 
Mastigopus, auct.), which sometimes differs very much from the 
somewhat older stages. 
When the black-eyed form of a species has been described else- 
where or will be mentioned in my later notes, the» name in the 
tabular view is printed with interspaced letters; if the really 
mature form is known I further mark the name with an asterisk. 
When the same stage, in most instances the adult one, has been 
described under various names, they are given as synonyms following 
the 58%) name, but the different stages of a species are connected 
with a {. 
. By this, perhaps somewhat artificial, mode of proceeding it will, 
I hope, be easy to form a notion of the species. 
