THE 
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they resemble to such an extent the genus Pygaster that they may be after all the 
young of the species of Pygaster mentioned by Lovén as found in the West 
Indies. A very critical revision of the young of Echinolampas and of Conocly- 
pus is necessary to define the systematic position of these young sea-urchins. 
Station 155. 88 fathoms. Off Montserrat. 
แล อ ด ละ ifo 118 EF * Dominica. 
SO 116 ne “St. Lucia. 
RL 76 * * Barbados. 
Pourtalesia miranda A. Ac. 
Fragments of some of the other genera of Pourtalesiæ but too imperfect for 
accurate determination, were also collected, principally from Barbados, 
Station 265. 576 fathoms. Off Grenada. 
Urechinus naresianus A. Ac. 
This is another of the abyssal species having a most extensive geographical 
range. Iam unable to distinguish the specimens collected by the “ Blake” from 
those collected by the “ Challenger” in the Southern Ocean. 
Station 222. 499 fathoms. Off St. Lucia. 
OU CC "5 Tat. 41? 94' 45" N., Long. 65? 35' 30" W. 
Homolampas fragilis A. Ac. 
Station 162. 734 fathoms. Of Guadeloupe. 
Paleeotropus Thomsoni A. Ac. n. sp. 
At Station 781 a single broken specimen of this species was collected, it differs 
most strikingly from all the other specimens of Palmotropus collected. It is 
closely covered by uniform tubercles on the abactinal side. It has a proportion- 
ally greater number of coronal plates, and a high test, with a keeled posterior 
interambulacral median line. Apex more posterior than in P. Josephine. 
The color of the test is yellowish white when alive. The large P. Josephine 
are of a dirty greenish red color, and when young more pinkish, This species is 
also remarkable for its broad, bare posterior lateral ambulacra on the abactinal 
side, and for its prominent keeled, very elongate actinal plastron, and its longi- 
tudinally elongate anal fasciole, still very prominent at a time when in P. Josephine 
the posterior extremity has become flattened, and the fasciole quite indistinct. 
Station 321. 933 fathoms. Lat. 32° 43' 95" N., Long. 77° 20' 30" W. 
