62 DR. H. GADOW ON THE SUCTORIAL [Feb. 20, 



Stichopus assimilis. (Plate XV. fig. 7.) 



This species would appear to have a considerable resemblance to 

 the form lately described by Prof. Greef ' from Rolas (S. macidatus) ; 

 but it is at once to be distinguished from it by the characters of its 

 spicules. 



Body elongated considerably, the suckers richly developed on the 

 trivial surface ; a shallow groove extends down the middle of the 

 trivium from the mouth along the anterior two thirds of its length. 

 The suckers are so numerous that the existence of three sets of rows 

 is only faintly indicated. Papillae and suckers of bivium richly and 

 well developed. 



The pieces of the calcareous ring are short, but very broad ; the 

 rest of the viscera have been largely ejected ; but there is evidence in 

 favour of the genital tubes having been few, simple, and, in proportion 

 to the body, short. 



The integument is pretty thick, and is very richly supplied with 

 spicules ; in addition to the turriform bodies there are flattened 

 reticulated bars of very characteristic appearance ; but I have de- 

 tected none of the ordinary C-shaped bodies. 



Length 116 millim.; breadth 28 millim. 



Colour deep chocolate-brown (in spirit), but a patchwork of colour 

 not unlike that of ;S'. maeulatus was, probably, to a certain extent 

 developed in this species. 



Hab. Angola. Purchased of Mr. Monteiro. 



EXPLANATION OF PLATE XV. 



Fig. 1. Spicule of Caudina jneridionalis, p. 58. 1 a. Seen from the side. 



2. „ Ocnus vicarius, p. 59. 2 b. Seen from the side. 



3. ,, Thy one meridionalis, p. 59. 



4. ,, Thyone cunninghami, p. 60. 



5. ,, PAi/Uojihorus dobsoni, p. 60. 5 a. Seen from the side. 



6. „ Stereoderma murrai/i, p. 61. 



7. „ Stichoims assimilis, p. 62. 



All these are magnified 220 times. 



6 b. Calcareous ring of P. dobsoni, multiplied twice nat. size. 

 6 b. Calcareous ring of S. nmrrayi, multiplied three times. 



3. On the Suctorial Apparatus of the Tenuirostres. 

 By Dr. Hans Gadow. 



[Keceived February 20, 1883.] 



(Plate XVI.) 



Thefollowingremarksare devoted to an explanation of the manner in 

 which the sucking of the "Tenuirostres" is performed. This applies 

 chiefly to the Nectariniince and Meliphagince. Zosterops and Certhia, 

 although not suctorial birds, are treated of likewise, because they are 

 closely aUied to the Tubilingues. The Trochilidee are mentioned 

 ' Zool. Anzeiger, v. p. 158. 



