MUSEUM OF COMPARATIVE ZOOLOGY. 77 
remarkable type of the Willemcesia group (Eryoneicus), together with 
the many types characteristic of muddy bottoms, as Glyphocrangon, No- 
tostomus, Heterocarpus, Pentacheles, and Nematocarcinus, many of which 
we afterwards dredged in the Gulf of California. I may mention one 
haul which contained a goodly number of a species of Nepbrops. The 
paucity of Echini is most striking, although we brought up in one of 
the hauls numerous fragments of a gigantic species of Cystechinus, sub- 
sequently dredged in the channel between Galera Point and the Galapa- 
gos, as well as in the Gulf of California, The occurrence of Cystechinus 
so far north is interesting ; the specimens collected by the “ Challenger” 
came from the Southern Ocean, and a fossil species of the genus has 
been described by Gregory from Barbados. ‘Other Echini characteristic 
of muddy bottoms, such as Aspidodiadema, Urechinus, Pourtalesia, and 
Schizaster, were brought up from deep water, while on rocky bottom 
we found Salenia and some species of Cidaride, all closely allied to their 
West Indian representatives. The number of Ophiurans was remarkably 
small as compared with the fauna of deep waters on the Atlantic side, 
where it often seems as if Ophiurans had been the first and only objects 
created. The absence of deep-sea corals is also quite striking. They 
play so important a part in the fauna of the deeper waters of the West 
Indies, that the contrast is most marked. Gorgonie and other Halcy- 
onoids are likewise uncommon, We found but few Siliceous Sponges, 
and all of well known types. Starfishes are abundant, and are as well 
represented in the variety of genera and species as on the Atlantic side 
of the Isthmus. I may also mention the large number of deep-sea 
Holothurians (Elasipoda) which we obtained, as well as a most remark- 
able deep-sea Actinian, closely allied to Cerianthus, but evidently be- 
longing to a new family of that group. We found occasionally, when 
trawling over the region of green mud, large tracts of mud tubes; they 
belong to the usual types of deep-sea West Indian Annelids, 
In the deeper parts of the channel between Galera Point and the 
southern face of Chatham Island we found a great number of Elasipoda, 
among them several genera like Peniagone, Benthodytes, and Euphronides, 
represented by numerous species. The Starfishes of the second part of 
our cruise did not differ materially from those collected during our first 
trip, but we added some fine species of Freyella, Hymenaster, Astro- 
gonium, Asterina, and Archasteride to our collections. Among the 
Sea-urchins on two occasions we brought up fine hauls of a species of 
Cystechinus with a hard test, many specimens of which were in admira- 
ble state of preservation. Among the Ophiurans nothing of importance 
