NATURAL SCIENCES OF PHILADELPHIA 
225 
rectifications of sj'nonymy. The species which is figured and described under 
the name of Fario gairdneri is not the Salmo gairdneri of Sir John Richardson. 
Nor does it appear to be any of the other species recorded in the " Fauna 
Boreali Americana." To distinguish it henceforwards from its congeners we 
will call it Fario neivberrii, or else Salmo newberrii^ just as it may suit systematic 
writers. It is sufficient for the present to refer to the description alluded to 
above. 
My friend Dr. Geo. Suckley, who has devoted much time in studying the 
manners and habits of the Salmonidae of Uregon and Washington Territories, 
being now engaged on a work upon that family, I leave the rest of the subject 
with him, without further comment upon the specimens which he has himself 
collected, 
IV. 
In that same Report upon the Fishes of the TJ. S. P. R. R. Explorations and 
Surveys we have instituted the genus Tlialeichthys upon a species of Salmonid 
which we had at first glance referred to the genus Osmerus. In treating of its 
characters, comparatively with both Osmerus and Argentina^ to which genera it 
is closely allied, we omitted accidentally to compare it with the genus Mallotus, 
to which it bears some affinities, but from which it however differs by a more 
anterior position of the dorsal and ventral fins, by its small and lanceolated 
pectorals, and by the absence of maxillar teeth. As to the species referred to 
under the name of Thaleichthys stevensi, a further examination having shown 
its identity with Salmo {Mallotus?) pacificus of the "Fauna Boreali Americana/' 
it is henceforwards to be designated under the name of Thaleichthys pacificus. 
Prodromus descriptionis animalium evertebratoram, quae in Expeditione ad 
Oceanum Pacificum Septentrionalem, a Eapublica Federata missa, Cadwala- 
daro Ringg-old et Johanne Rodgers Ducibus, observavit et descripsit 
W. STIMPSON. 
Pars VII. CRUSTACEA ANOMOURA. 
I. TELEOSOMI. 
Segmentum ultimum thoracicum non liherum. 
Synopsis DROMIDEORUM. 
A. Pedes 4ti Stique paris subprehensiles. 
Dromidia, nov, gen, Carapax convexus, pilosiis. Palatum utrinque col- 
liculo instructum. Foeminae sterni sulci ad segmentum clielipedum producti 
et in tuberculum approximati ; appendices abdominis articuli penultimi 
minutae, celatse. Pedes lis DromicR similes. 
Typus, D. hirsutissima. Dromia hursutissima, Lam'k ; An. s. vert, 
r. 264. I)esm. ; Consid. sur les Crust, p. 137, pi. xviii. f. 1. — Africa Australia 
D. Antillensis, Stimpson. — Ins. Antillarum. 
D. spongiosa et excavata, infra. 
? Dromia globosa, Lam'k ; 1. c. t. 264. 
? Dromia gibbosa, M. Edw. ; Hist. Nat. des Crust, ii. 175. 
? Dromia unidentata, Ruppel ; Besclir. und Abbild. Kurzschw. Krabben, 16, 
pi. iv. f. 2. — Sinu Arabico. 
? Dromia rotunda, McLeay ; in Smith's Hist. S. Afr. ZooL, p. 71. Africa 
Australi. 
Cryptodromia, nov. gen. Carapax convexus, pubescens, vix pilosus. Pa- 
latum utrinque colliculo instructum. Foeminse sterni sulci remoti, ad segmen- 
tum pedum secundi paris tantum producti, terminis in tuberculis. Pedes iis 
Dromice similes, sed nodosi. Species parvae. 
1858.] 
