28 IVAR ARWIDSSON, SYSTEMATIC NOTES ON SOME MALDANIDS. 



or less marked of f , dorsal glandular spöt, which moreover distinctly extends in the longi- 

 tudinal direction of the body. This little patch can also be traced in specimens, even 

 small ones, from East Greenland. 



Praxillella affinis (M. Särs). 



1872. Clymene affinis M. Särs (10, p. 412). 



1907. Praxillella affinis (M. Särs) Arwidsson (24, p. 177). 



This species is present from the following localities. 



North Sea: East of Hartlepool, 54°41' N, 0°51'30" W, 52 m. (SS Huxley, July 

 10 th , 1906): 1 specimen; ocelli not visible. 



Firth of Clyde: Between Little Cumbrae and Millport, mud, Sept. 1912. 4 incom- 

 plete specimens, one of which, however, permits us to establish the number of setigerous 

 segments typical of the species. 1 ef has fairly small spermatospheres and 1 $ immature 

 eggs, the largest of which are 0*24 mm. in diameter. 1 specimen has the anterior end 

 regenerated from the l st setigerous segment inclusive and 1 has the posterior end rege- 

 nerated from the 9 th setigerous segment inclusive. — Millport, mud, 11 — 12*5 m., July, 

 1910. 1 specimen. The ocelli of this specimen agree exactly with my description of 

 1907. A smaller specimen from locality Sept. 1912 has about 7 ocelli on each side; a 

 larger one also lacks middle ocelli groups, and in addition the lateral groups extend 

 far forward towards the notches between the cephalic point and the borders. The 

 typical anterior and posterior capillary setae on the 10 th — ll th setigerous segments are 

 observed at all the localities. 



Praxillella praetermissa (Malmgren). 



(Pl. 1, figs. 22—23.) 



1865. Praxilla praetermissa Malmgren (6, p. 191). 



1882. Praxillella, praetermissa (Malmgren) Verrill (12, p. 298). 



This species is present from the following localities in the Firth of Clyde: Between 

 Little Cumbrae and Millport, Sept. 1912; mud, 11 specimens, 4 of which are complete 

 (19 setigerous segments); maximum length: probably 70 mm., 2 spec. about 12 mm. 

 12*9 few eggs, the largest in a compressed condition 0*24— 0'28 (—0*3) mm. in diameter. 

 Off Great Cumbrae, July 1902. 6 specimens, one of which is complete (19 setigerous 

 segments). 1 c? with masses of spermatospheres in different stages. The anterior end, 

 up to and including the ll th setigerous segment, of the largest specimen is 46 X 2 mm. 

 Fig. 22 shows the distribution of glands on the dorsal side of the 6 th setigerous segment 

 of this specimen; it resembles in this respect specimens from Bohuslän on the west 

 coast of Sweden. On the lower side of a number of specimens the same segment has 

 glands behind the orifices of the nephridia (see fig. 23); on the 7 th setigerous segment 



