880 DR. J. STUART THOMSON OX 



Nutting has given the following diagnosis of the genus 

 Muriceides : — 



" Muriceides W. et S. (emended). 



Muriceides Studer + Clematissa Studer, Archiv f. Naturgesch., 

 Jahrg. liii. Bd. i. pp. 54, 55. 



Muriceides Wright & Studer + Clematissa Wright ifc Studer, 

 'Challenger' Reports, the Alcvonaria, 1889, pp. lii, liii, 1U5, 

 106. 



■' Calyces cylindrical, or in the form of truncated cones, their 

 walls filled with vertically-placed spindles, often modified into 

 clubs, discs, or triradiate forms vertically placed, but not 'en 

 chevron,' and not forming a true crown of points around the 

 margin. The opercular spindles are placed ' en chevron ' on the 

 tentiicle bases. The ca?nenchyma contains spicules of various 

 forms, and the bi^anches may, or may not, end in calyces." 



ACAXTHOGORGIA ARMATA Terrill. 



The colony is irregulai-ly branched. The coenenchyma is thin, 

 and filled with conspicuous, white spicules. The verrucfe are 

 elongate, often curved, capitate or clavate, surmounted by eight 

 groups of long, divergent, sharp spicules, with an ii'regular 

 "• chevi'oned " ari-angement. 



The axis has a yellowish-brown colour. The spicules are white, 

 rough, curved, and fusiform. The colour of the colony is ash- 



This species has been previously recorded by Hickson from 

 off Vasco da Gama Peak, 230 fathoms. There are thi-ee good 

 examples in the jiresent collection. 



Locality, etc. — P.F. 18857. Cape Morgan, N. -2- W. 13 miles. 

 Depth. 250-320 fathoms. By shrimp ti'awl. Nature of bottom, 

 broken shells. Date, July 8,' 1906. 



Family P l E x A r R i D .E. 



ErxicELLA PAPiLLosA Esper. (Plate XLIII. figs. 2 k 3.) 



The colony measures 162 mm. in length and 112 mm. in 

 breadth. It has a basal encrusting part measuring 11 mm. in 

 length and 15 mm. in breadth. The branches are all disposed 

 in one plane. The verrucse occur over the entire surface of the 

 colony, even on the flat encrusting base. The main axis and 

 most of the branches are cylindrical, but occasionally some of the 

 upper branches are slightly flattened. Proceeding from the main 

 stem, the branches gradually decrease in diameter but expand 

 again near the apices. Some of the branches have a few local en- 

 largements, but these are probably not of speciflc importance. 

 The verrucae give to the colony its papillated appearance ; the 

 largest are about 2 mm. in height and 1'2 mm. in diameter, 

 the smallest are only fractions of a millimetre. The surfaces of 

 the verrucpe are covered by a mass of spicules. A rough transverse 



