172 



DISCOVERY REPORTS 



Tomopteris {Tomopteris) planktonis Caroli, 1933, pp. 378-9. 



Tomopteris {Tomopteris) cavalli Monro, 1936, p. 121. 



Tomopteris (Tomopteris) planktonis Monro, 1936, p. 121 (in part). 



Tomopteris (Tomopteris) septentrionalis Monro, 1936, pp. 121-2 (in part). 



Tomopteris planktonis Monro, 1937, p. 270. 



Tomopteris (Tomopteris) planktonis Terio, 1947, pp. 356-7. 



Tomopteris (Tomopteris) planktonis Stop-Bowitz, 1948, pp. 52-4 (in part), fig. 39. 



Tomopteris (Tomopteris) planktonis Stop-Bowitz, 1949, pp. 13-16. 



Tomopteris planktonis Wesenburg-Lund, 19506, pp. 43-4. 



Tomopteris (Tomopteris) planktonis Stop-Bowitz, 1951, p. 9. 



Description. In Table 2 measurements of a selection of specimens from various stations and 

 depths have been listed according to size. 



Table 2. Measurements of Tomopteris planktonis 



* When the symbol (-0) is used it means that the net was hauled open to the surface because of failure in the closing 

 mechanism. 



The anterior border of the antennae is entire, and there is a pair of prominent eyes on the pro- 

 stomium. The first pair of chaetigers is never present in this species; the second pair reach normally 

 to about two-thirds the length of the body ; occasionally they are longer, but never more than the 

 body length. Hyaline glands appear apically on the neuropodial pinnule of all feet, but they are 

 frequently indistinct. The chromophil glands appear first on the inferior border of the neuropodial 

 pinnules of the fourth parapodia, and vary slightly in position and development according to the size 

 of the specimen. In the smallest, and almost certainly youngest forms (Text-fig. 6a), the gland is not 

 fully developed, but consists of a group of small tubules some distance away from the junction of the 

 corner of the pinnule with the parapodial trunk. In the largest and more mature specimens, the 

 gland consists of numerous tubules and projects right into this corner (Text-fig. 6/). Stages between 

 these two extremes are shown in Text-figs, bb-e but the glands are not always developed to the same 

 extent on all feet in the same specimen. In a specimen from St. 1776 the gland on the fourth foot 

 was developed as in Text-fig. 6 a, but on the seventh was similar to that illustrated in Text-fig. be. 

 From St. 254 there are a number of specimens with fully-developed chromophil glands on the fourth 

 to seventh feet but with no development of the gland from the eighth foot up to the end of the body. 

 A tail is never present in this species. 



