ECHINOCYAMUS. 16L 
Echinocyamus angulatus, Wyv. Thoms. Phil. Trans. clxiv. (1874) 
p. 747. 
Test always small, very variable in form. Spines short, greenish 
er yellowish, fading to white; some about twice as long as the 
rest and rather longer, more or less club-shaped ; a few longer than 
the rest around the mouth; the finer spines are thickest at their 
free end. 
The test has generally an elongated oval form, but sometimes, and 
more particularly with smaller specimens, it is rounded ; the lower 
surface is often flattened, but sometimes is more or less tumid; the 
upper is flattish or slightly arched. The tubercles are large and are set 
in deep areole, which in full-grown specimens give a characteristic 
deep-pitted appearance to the surface of the test. The ambulacral 
are wider than the interambulacral areas; there are six or seven 
pairs of pores, the distal more widely separated from one another 
than the proximal. Mouth rather large, circular or suboval in form ; 
anus about half as far from the edge of the test as from the mouth. 
Length. Breadth. Height. 
6 4-6 25 
6 5 3 
5 4 2 
3°5 3 2 
Quite unlike any other British Echinoid; generally distributed, 
but not well represented in collections. 
Distribution. Both sides of North Atlantic (from Azores to Nor- 
way; Florida); Mediterranean. 0-325-fms. 
a-d. Mouth of Sound of Mull. J. Murray, Esq. 
e, f. Arran. Rey. D. Landsborough. 
g-k. Castle Chichester, 6-10 fms. (Aug. Belfast Nat. Hist. Soe. 
26th, 1844). 
1. Portmarnock. Belfast Nat. Hist. Soe. 
m,n. Near Tenby (May 1888). 
o-z. Kent. 
a', b'. Berwick-on-Tweed. Dr. G. Johnston. 
c'-f’. Montrose. W. Duncan, Esq. 
g'-l'. Sandwich Bay, Shetland. KE. M. Nelson, Esq. 
Arachnoides placenta. 
Hehinarachnius placenta, Gmelin; Forbes, Brit. Starf. (1841) p. 178, fig. 
This species, confined, so far as is known, to the Indian and Pacific Oceans, 
is stated by Forbes to have been dredged by Jameson in deep water off Foula. 
The specimen is not now to be found in either the Museum of Science and Art 
or the University Museum at Edinburgh, and it is impossible to say what the 
error is Or whence it arose. 
