80 BULLETIN OF THE 
After passing the Tres Marias, we made several hauls, and obtained 
some Umbellule, Pennatule, Trochoptilum, Anthoptilum, and a fine 
Antipathes, a few Comatule, a large Astropecten, some fine specimens 
of Urechinus and of Schizaster, a few Holothurians, Lophothuria, and 
Trochostoma, and two species of Elasipoda, besides a few fragments of 
Gasteropods, with an empty shell of Argonauta. 
Among the Crustacea there came up the usual types found living upon 
muddy bottom, such as Glyphocrangon, Heterocarpus, Notostomus, Pen- 
tacheles, Nematocarcinus, and Nephrops, together with species of Litho- 
des and of Munida. The usual types of limicolous Annelids were also 
found here, Halinecia, Terebella, Maldania, and the like; a few Ophi- 
urans, Ophiopholis and Ophiocantha ; a few fragments of Farrea, and a 
huge Hyalonema of the type of H. toxeres. Among the Fishes there 
were a few Macruride, Bathypterois, Lycodes, and Malthe. 
CoMPARISON OF THE Drgp-WATER ECHINI OBTAINED IN THE PANAMIC 
AND CARIBBEAN DISTRICTS. 
There will naturally be considerable delay in obtaining the results 
even of the preliminary examination of the collections sent to the dif- 
ferent specialists. To illustrate, therefore, somewhat more in detail 
the contrasts between the deep-water fauna of the Panamic and of the 
Caribbean districts, I will make here a very general comparison of the 
Echini collected on the two sides of the Isthmus of Panama. The iden- 
tifications here given are of course subject to the revision of the closer 
and final determination of the collections. This subject will later be 
fully illustrated by comparative tables of the distribution of the species 
on the two sides of the Isthmus. 
I may state, in general, that we have discovered in the deep-sea fauna 
of the Panamic district only one genus of Sea-urchins, allied to Salenia, 
not previously represented on the Atlantic side. The poverty in Clype- 
astroids was as striking as on the Atlantic side, and in the very heart of 
the shallow water district so markedly characterized by Clypeastroids on 
both the Atlantic and Pacific sides we dredged only one specimen of 
Clypeaster, in 75 fathoms. As in the Caribbean, we find Phormosoma 
and Asthenosoma; also one species of Aspidodiadema and one of Salenia ; 
Cidaris, Dorocidaris, and Goniocidaris, as well as Porocidaris; which 
offer an exact parallel in the Pacific to the same genera on the Atlantic 
side. Of course, how far they are allied a more accurate comparison 
alone can determine. We may, however, call attention to the absence 
of Arbaciade, which as littoral genera are eminently characteristic of 
