408 Transactions of the Society. 



bears a nearly circular wreath of vibratile cilia. The brain-sac 

 carries a red eye imbedded in grey granules, and just above it the 

 large dorsal antenna is seen to emerge, slanting backwards. The 

 lateral antennae are also conspicuous by their size, protruding 

 low down at the sides of the body. A mouth, jaws, and digestive 

 tract are absent ; a large sperm-sac fills the greater part of the body- 

 cavity. The male was seen to attach itself invariably to the side 

 of the female. Although the males became abundant in the water 

 I never observed an egg with thicker walls that could be recognised 

 as a fertilised resting egg, and such eggs are sb far quite unknown 

 in any Synchseta. 



Size of female : 142 ui {j^-q in.) in length by 82 //, (3 \ Q in.) wide 

 at the auricles ; young and smaller animals are always present also. 

 The male : 78 /u, (g 1 ^ in.) in length ; the eggs are slightly oval in 

 shape. Female eggs, 61 ll (^-j-g in.) by 47 • 5 p (g-33 in.) ; male eggs, 

 42 • 5 /* (eh in -) by 35 • 7 /* ( t \q in.). 



Synchseta vorax sp. n. 

 PL VIII. fig. 19. 



Spec. Char. — Body stout, more cylindrical in shape rather than 

 conical, pointed anteriorly, with a well-marked, narrow, fairly long, 

 and flexible foot, carrying two distinct toes. Frontal styles four ; 

 in addition to usual dorsal and lateral antennae it has a unique 

 tubular frontal antenna. Cervical eye large, red, appearing double. 

 Size of female, average 272 /x (^3 in.) long by 136 ll ( T |-g in.) 

 broad across the auricles. One large specimen measured 340 ll 

 (7*5- in.) long by 149 ll (^q in.) broad. Male with three tubular 

 frontal antennae and two movable, setose, fleshy processes in front 

 of head ; 149 ll ( T f q in.) long. Marine. 



In June 1898, in sea water from the harbour of Dundee sent 

 by Mr. John Hood, I first discovered a few specimens of this new 

 and savage species in company with S. triophthalma, and then 

 again in June 1899 Mr. Hood obtained it in the same spot in 

 larger numbers, which I was able to preserve and mount most 

 perfectly. It has not been met with at any other season or place, 

 and seems to be a summer form. 



EXPLANATION OF PLATE VIII. 



Fig. 17. — Synchxta gyrina Hood 9 Dorsal view, x 300. 

 „ 18 „ tavina Hood ? Dorsal view, x 325. 



„ 19 „ vorax sp. n. Rousa. ? Dorsal view, x 275. 



„ 19a „ „ ., The male, dorsal view, x 300. 



„ 19b „ „ „ One uncus of the jaws. 



„ 19c „ „ „ One ramus and fulcrum of the jaws. 



