538 W. DE MORGAN. 



et Travaillcur Expedition, also recognized the two bundles of genital 

 tubes (10), p. 485, and included his specimens in the genus Stichopus. 



Herouard (4), p. 8, described what he thought to be a new species 

 under the name of Stichopus Richardi. E. Perrier (11) called attention 

 to the resemblance between this new species and Holothuria tremula, 

 and also how it differed in the arrangement of the ambulacra, and in 

 possessing two bundles of genital tubes. Perrier then read Ostergren's 

 work, and concluded that Stichopus Richardi and Stichopus tremulus are 

 identical. 



He tlien made certain additions to Ostergren's description, and gives 

 figures of the sclerites. Herouard (4), PI. VIII, gives drawings of the 

 sclerites of Stichojms Richardi which agree with Perrier's. He, however, 

 does not figure the " spire " (or " tige," as Perrier has it) of the disc, 

 which is very characteristic. 



The Huxley specimens agree with Perrier's description of 

 Stichopus tremuhcs in external form, in the shape of the sclerites, and 

 in possessing two bundles of genital tubes, one on each side of the 

 dorsal mesentery. Both Theel (12) and Jeffrey Bell (1) make the 

 absence of C-shaped deposits characteristic of Holothv/ria. Perrier 

 describes arciform spicules in the ambulacral papillae, and in the ventral 

 feet of Stichopus tremulus^ and such arciform spicules appear in the 

 Huxley specimens, some being sufficiently curved to warrant the de- 

 scription C spicules. 



These specimens have been some years in spirit, but in places a 

 faint rosy tinge is still discernible. 



Stichopus regalis (Cuvier). 



Holothuria colurmnce. Cuvier. 1817. 

 Holothuria triquetra. Delia Chiaje. 1828. 



Station XI. 146 fathoms. 1 specimen. 



Stichopus regalis is easily recognized by the flattened ventral surface, 

 and the well-marked division between that and the slightly convex 

 dorsal surface. The discs of the tables also are very characteristic. 

 They have a fairly unbroken margin, and want the sharp marginal teeth 

 found in Stichopus tremuhis. They are perforated by numerous holes, 

 Theel (12). 



Perrier's (11) description is very similar. He states that in young 

 specimens the four rods are longer in proportion to the diameter of 

 the basal disc, and are more convergent at the top. Also that in young 

 specimens, the four rods are smooth, and end in a point, while " chez les 



