Gatly Marine Luboralorj/j .SV. Andrews. 75 



nipasuriiij^ 30 mm. from tlio c(l«:;c of the main tnink, and 

 about '27 nun. in l)rea<ltli at the base (i. e. next the main 

 axis), the ti|) l)iin^ sh;fhtly tapered and ronn(k-d. The 

 jirocef^s is marked dorsally by three transverse eonstricti(jns, 

 which divide it into fonr psendo-sej;ments. 



The rijiht limb of tlie fork is more oblique, its rif(ht 

 1)order measures .'JO mm. from tlie main stem, but its left is 

 only about ^5 nun. Two transverse wrinkles make three 

 })seudo-se<;uieuts. 



Tlie under surfaee of eaeh of the limbs of the fork is 

 luiu-ked by a median ridge prolonged to the ventral surfaee 

 of the main trunk. 



Mr. Punnett's specimen was fresh when examined, and thus 

 was preserved in fairly good condition. He observes : — 



" \Vhcn it reached me it was unfortunately already mori- 

 bund and did not allow of any observations being made upon 

 its method of locomotion. Alter narcotisation with a 1 per 

 cent, solution of choral hydrate in sea-water a sketch was 

 made and measurements taken : — 



" Length of unpaired anterior part 7 cm. 



„ right posterior part 93 „ 



„ left posterior part 11 „ 



"The right posterior portion was, liowevcr, broken off, and 

 probably when entire was slightly longer than the left, since 

 its cross section near the point of bifurcation is rather 

 greater. The worm was then fixed in a saturated solution 

 of corrosive sublimate and sections were cut across the 

 forked part. These w ere reconstructed into the diagrammatic 

 figure given [PI. 11. fig. 3]. 



" From this it will be seen that the median organs, i. e. the 

 gut, the dorsal blood-vessel, and the rhynehoca?lom, bifurcate, 

 Avhilst the lateral nerve-cords and blood-vessels of the 

 aiitcrior end are continued down on the outer sides of each 

 of the two j)osterior portions. It is worthy of note that the 

 ncurochords, characteristic of this group of Nemcrtines, were 

 found along the outer nerve-cords of tlie two posterior ends, 

 but were lacking in the inner cords. 



"A subsequent dissection of the anterior end showed that 

 the proboscis was present and more or less coiled up. Its 

 length even in the state of contraction following preservation 

 vas 105 cm., ?'. e. considerably greater than the length of 

 the rhynchocalom before its bifurcation. It showed, how- 

 ever, no trace of di\ision. 



