519 



to speak — with its tubes. It is very tenacious of life provided that 

 its supply of oxygen is adequate. Small pieces on the surface of the 

 sand began to régénérât lost parts and burrowed into the sand. It is 

 extremely fragile and most difficult to procure whole. 



The only other Doliclioglossus recorded from Great Britain is D. 

 ruber found by Tattersall off the west coast of Ireland. 



Mr. Tattersall has most kindly sent me specimens of D. ruber 

 to compare with mine. My new species, for which I propose the name 

 Doliclioglossus serpentinus, differs outwardly from D. ruber in being 

 longer, more attenuated, in having a proportionately much longer pro- 

 boscis, in the cylindrical shape of the proboscis, and in the colour of the 

 trunk which is yellow with vermilion spots instead of brown with lilac 

 spots. D. ruber has no special scent. 



Internally the differences are much greater. The coelomic cavity 

 of the proboscis is very small in D. serpentinus but extremely large in 



Fig. 2. Semidiagrammatic figures of transverse sections of the proboscis of 

 D. ruber (A), D. serpentinus (B), and D. kowalevskii (C). 



D. ruber, and corresponding with this the longitudinal muscles of the the 

 proboscis of D. ruber are much less developed than in D. serpentinus. 

 Fig. 2 illustrates these differences quite clearly. D. ruber is said to have 

 two proboscis pores (though there is only one in the specimen sent me 

 by Mr. Tattersall) while I have never found more than one in D. 

 serpentinus. There are many others which I need not go into at present. 

 D. serpentinus resembles D. kowalevskii more closely, but it is distin- 

 guished from it by the greater length of proboscis, by its colourings, 

 and by the almost complete absence of the concentric arrangement of 

 the longitudinal muscje fibres of the proboscis. 



There is in D. serpentinus no backward prolongation of the collar 

 over the gill clefts, and the first gill opening is a mere pore while the 

 2 nd to 5 th are progressively larger, the sixth being the first cleft of 

 what one may term normal size. At the posterior end a similar diminu- 

 tion occurs. There are about 60 pairs of clefts in a large specimen. 



There are two other species which should be considered, namely D. 

 sulcatus and D. mereschkowskii. 



