22 



ZOOLOGISCHE MEDEDEELINGEN — DEEL V. 



IV. - NEW SPECIES OF THE GENUS AMMÜTRYPANE RATHKE. 

 BY Dr. R. HORST. (WITH 3 TEXTFIGURES). 



Among the collection of Annelida of the Leyden Museum I met with 

 some specimens of the interesting genus Ammotrypane, collected in the 

 Malay Archipelago. Our knowledge of this genus of Opheliïdae is rather 

 scanty. However as, according to the investigations of Grube ') and Kü- 

 kenthal 2 ), the number of segments and branchiae in each species are 

 fixed, I presume that the species, mentioned in this paper, hitherto have 

 not been described. The only species mentioned till now from that part 

 of the Indo-Pacific are Ammotr. remigera Ehl. and — polycheles Gr. 3 ), 

 also found in the neighbourhood of the Aroe-isles, like three of our 

 species. 



Ammotr y pane kampeni n. sp. Fig. 1. 



A specimen, measuring in length 35 mm. and provided with 58 pairs 

 of parapodia, could not be identified with any of the species, already 



described. The body is faintly annulated, 

 but does not show intersegmental grooves. 

 The head is rounded above, not keeled 

 I] A and furnished with a conspicuous palpode. 



l^^'^iiSï The first P air of P ara P odia la cks the 

 J/ branchia and consists only of a short, 

 conical process with bristles; however 

 the succeeding ones are all provided with 

 it. In the anterior segments the branchia 

 reaches to half the length of the lateral 

 side, but commencing with the 10 tQ one they grow longer, though not 

 extending to the dorsal median line. A ventral cirrus, as present in some 

 species, is not visible ; the ventral bristles, dilated at their base, are shorter 

 than the capillary dorsal ones. The anal tube much resembles that of 

 A. langii Kth. ; it is elongated, nearly translucent and shows about 30 

 rings. Along the border of the ventral opening short cirri are placed, 

 which are wanting in A. langii and at the base of the tube a couple of 



vT/vy->nrvTWTt"VT«Trv" 



Fig. 1, 



1) Die Familie der Opheliacëen: Jahresber. Schles. Gesellsch. f. Yaterland. Kultur, 1868. 



2) Die Opheliacëen der Expedition der „Veitore Pisani" : Jen. Zeitschr. f. Naturwissen- 

 schaft, Bd. XXI, 1887, p. 361, PI. XXI. 



3) Polych. Anneliden von den Aru- und Kei-Inseln*. Senckenb. Naturf. Gesellschaft, Bd. 

 XXXV, 1917, p. 245, PI. XVII, figs. 1-4. 



