‘PORCUPINE’ DEEP-SEA DREDG-ING-EXPEDITIONS 
745 
Genus Toxopneustes, Agassiz. 
1. Toxopneustes drobachiensis , Muller. 
Of this species T. pictus, Norman, and T. pallidus, G. O. Sars, can only be regarded 
as varieties. It is generally distributed at depths beyond 100 fathoms in the northern 
seas. 
2. Toxopneustes brevispinosus, Reiss, sp. 
In shallow water off the coast of Spain. 
Genus Psammechinus, Agassiz. 
1. Psammechinus miliaris, Lamarck, sp. 
Abundant in the British area at depths less than 50 fathoms. 
2. Psammechinus microtuber culatus , Agassiz. 
A few examples were dredged in shallow water off the coast of Portugal. 
Order II. Petalosticha (E. Hackel). 
Family 1. Cassidulid^. 
Genus Neolampas, A. Agassiz. 
Outline of the test pyriform from above, prolonged posteriorly into a short blunt 
rostrum and truncated. The test arches nearly uniformly from the anterior margin 
to the posterior rostrum. The oral surface is slightly concave. The ambulacra are 
flush with the surface of the test ; they are reduced to the greatest simplicity, showing- 
no rosette or other indication of a petaloid arrangement, but running from the apex to 
the peristome as a uniform double row of simple pores passing between the ambulacral 
plates and giving exit to minute conical tube feet. The mouth is pentagonal, nearly in 
the centre of the oral surface of the test, a little nearer the anterior border. It is sur- 
rounded by a well-marked floscelle and distinct bourrelets. The apical disk is on the 
upper surface of the test, nearly directly vertically over the mouth ; it is compact, with 
three large ovarial openings, five very distinct pores for the sense-organs, and a rather 
small madreporic tubercle in the middle. The anal opening in the test is large, occu- 
pying a deep depression in the truncated posterior extremity of the shell. 
Neolampas rostellata , A. Agassiz. (Plate LXIX.) 
Synonym: — Neolampas rostellata , A. Agassiz, Bulletin of the Museum of Compa- 
rative Zoology, 1869. 
The single specimen procured in the 6 Porcupine ’ Expedition, which was dredged 
living in 690 fathoms at the mouth of the English Channel, is 20 millims. in length, 
16 millims. in extreme width across the ambitus, and 7 millims. in height. The outline 
from above is not quite symmetrically oval or pyriform, the shell bulging on either side 
somewhat irregularly towards the posterior extremity. In profile, the anterior end of 
5 h 2 
