ECHINOCYAMT/S, 



161 



Eckinocyamus angulatus, Wyo. Thorns. Phil. Trans, clxiv. (1874) 

 p. 747. 



Test always small, very variable in form. Spines short, greenish 

 or yellowish, fading to white ; some ahont 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 areolae, 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. 



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. 



e, f. Arran. 



g-k. Oaatle Chichester, 6-10 fms. 

 26th, 1844). 

 I. Portmarnock. 

 m, n. Near Tenby (May 1888). 



o-z. Kent. 

 a', b'. Berwick-on-Tweed. 

 c'-f. Montrose. 

 ff'-l'. Sandwich Bay, Shetland. 



(Au 



J. Murray, Esq. 



Rev. D. Landsborough. 



Belfast Nat. Hist. Soc. 



Belfast Nat. Hist. Soc. 



Dr. G. Johnston. 

 \V. Duncan, Esq. 

 E. M. Nelson, Esq. 



Arachnoides placenta. 



Echinarachnius placenta, Gmelin; Forbes, Brit. Starf. (1S41) 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. 



M 



