i 7 8 DISCOVERY REPORTS 



Description. Fifteen specimens of this species have been examined, of which the largest measures 

 10-5 mm. long for twenty-two pairs of parapodia and the smallest 4 mm. long for sixteen pairs: the 

 others vary between these limits. The anterior border of the antennae is entire and there is a pair of 

 prominent eyes on the prostomium (Text-fig. 9). There is no first pair of chaetigers; the second pair 

 reach to about two-thirds of the length of the body. The hyaline gland is normally distinct (Text- 

 fig. 10) and appears in a dorsal position from the third neuropodial pinnule to the end of the body and 

 the chromophil gland appears ventrally from the fourth neuropodial pinnule. The pinnules border 



Text-fig. 9. Tomopteris ligulata : prostomium and 2nd pair of chaetigers of specimen from St. 2028. 



Text-fig. 10. Tomopteris ligulata: parapodium of specimen from St. 2028. 



the parapodia almost to the junction with the body wall (Text-fig. 10): this is a characteristic of the 

 species. In preservative the pinnules frequently become bent concavely backwards, possibly because 

 of the torsion exerted by their long line of contact with the parapodia. There is no tail. 



Discussion. Through the courtesy of Professor Stresemann and Dr Hartwich, I have been able to 

 examine two specimens of T. ligulata Rosa, identified by Ehlers, and described by him in the Deutsche 

 Siid-Polar Expedition's report, 1917, pp. 232-3. The specimens are from the Zoology Museum, 

 University of Berlin (Kat. no. 5857), locality, 63 42' S., 82 o' E., collected 17. iii. 1903. One 

 specimen is very fragile, 4-5 mm. long, with seventeen pairs of parapodia, with the pinnules not 

 continued close to the body wall, but rounded and typical of the T. planktonis condition shown in 

 Text-fig. 6a-f, p. 173; the chromophil glands are ventral and the hyaline glands indistinct. The 

 second specimen, not so fragile as the first, is 4-5 mm. long with sixteen pairs of parapodia. Again 



