HTMENOLEPIS NITIDA, KRABBE, AND H. N1TIDULANS, KRABBE. 37 



alpina, and the specimens were aggregated together in such 

 numbers that the interior of the intestine had the appearance of 

 a piece of plush. Friis also again found it parasitic in Charadrius 

 hiaticula, and in this instance, to quote Krabbe, to the naked 

 eye they resembled an aggregation of crushed oats, groats ; but 

 when submitted to the microscope, the granules were found 

 to be young tape-worms, the hooks on the rostellum correspond- 

 ing with those from Tringa alpina. Friis submitted his newly 

 found specimens to Krabbe, who noticed that there were points 

 about the worm which corresponded in some measure with that 

 of Berg's Taenia nitida, from Tringa maritima, more especially 

 the " cirrusblaeren " — " cirrusblaeren-oval staerkt lysbrydende " ; 

 but the hooks of nitida negatived it being that species, as the hooks 

 of the worm he had under consideration, although there was and 

 is a great similarity in their structural formation, measured but 

 054 — 0*057 mm., whilst those of Taenia nitida were 0*11 mm. 

 Consequently he formed a new species for this helminth, calling 

 it Taenia nitididans, in contradistinction to T. nitida. 



Krabbe's description of this pretty little worm is very 

 brief : " Uncinulorum, 10 mm. ; corona simplex, quorum 

 longit. 0*054 — 0*057 mm. ; aperturae genitalium secundae ; 

 habitaculum, Tringa alpina, Charadrius hiaticula, in Slesvico 

 (Friis)" — and in the brief text which follows he does not 

 enlighten us more on the external or internal anatomy of the 

 worm . 



Yon Linstow, 1882, took a tape- worm from Fuligula cristata 

 which he thought was the same as T. nitididans ; but Krabbe 

 dissented, and thought that the hooks more resembled those of 

 T. nitida. Since then, and up to the present time, as far as I 

 am aware, it has not been taken or recorded. 



I took this tape- worm from the intestine of a blackbird, 

 Tardus memda, in January, 1905. Specimens were fairly numerous, 

 and gregarious in the intestine. The longest was 25 mm., the 

 mature proglottis 0*337 mm. long by 0*844 mm. wide; whilst the 

 smallest was 3*363 mm. long. 



The scolex (Plate 6, Fig. 1) is sub-globular, 0*203 mm. in length, 

 and 0*253 mm. in diameter. The four suckers are very weak 

 organs of prehension. The rostrum is pyriform, and is composed 

 of strong retractor and circular muscles, and bears ten sharp- 

 pointed characteiistic hooks (Fig. 15), which correspond with 



