950 DR. H. J. HANSEN ON CRUSTACEANS [ Dec. 1, 
B. On the ext. br. of-urp. the ciliated part occupies more’ 
than the half of the exterior margin. 
S.corniculum, Kr., H. J. H. CS. lacene- 
atus, Kr.) 
S. utrinquedens, Bate. 
S. longirostris, Bate. 
To this group further belong the following species: S. precollus, 
Bate, S. semiarmis, Bate, S. longicaudatus, Stimps., S. remipes 
(Stimps.), and S. (Sciacaris) telsonis, Bate. All are but larve. 
Group II. 
Mep. considerably or much longer than trl}, its 4 prowimal joints 
considerably or (generally) very much merassated or partially almost 
inflated in proportion to the joints in trl.’, its two distal joints with 
very short bristles or totally naked along the one margin, the 
sixth joint with a number of spines very different in length along 
the other margin, anda feebler armature may also be found on the 
fifth joint. 
A. The adult and the older larve with two branchie above 
trl®., and the sixth joint of mxp.° divided into 5 subjoints. 
The adult with a comb of very numerous short spines 
along the one margin of the sixth joint and of the distal 
part of the fifth of mxp.* The larve with short eye-stalks. 
*S. hensenit (Ortm.). 
{ S. sargassi, Ort. 
B. The adult and the older larve with one branchia and a 
lamella above trl*., and the sixth joint of mxp.* divided 
into 4 or 6 subjoints. The adult without any comb on 
mxp.* The larve with moderately long or very long eye- 
stalks. (The edwardsti-group.) 
a. On the ext. br. of urp. the exterior margin is ciliated in 
the whole length or (in the larve) at least in c. +4 of 
the length.’ 
*S.edwardsi, Kr. 
S. oculatus, Kr. 
b. On the ext. br. of urp. the exterior margin is ciliated at 
most in Z of the length. 
a. The same exterior margin is in the larve ciliated at 
least in ?, in the adults in more than 4 of the length. 
| *S. vigilawx, Stimps., H. J. H. 
S. parvidens, Bate. 
*S. penerinki, Bate, H.J. H. 
(6. The same exterior margin is ciliated in less than # of 
the length. 
*S.incertus, n. sp. 
*S. halia, Faxon. 
S. armatus, Kr. 
' Here and in the following part of the tabular view I cannot include larvie 
shorter than 9-10 mm, in length, as the character employed alters in the 
youngest stages (see later on). 
