BALANOGLOSSUS OTAGOENSIS. 501 



noticeable external character, namely, in having a grooved 

 proboscis. Spengel had portions of three specimens of this 

 species, B. sulcatus, Spengel, which he was unable to further 

 investigate owing to an accident that happened to them. He 

 gives a drawing, however, on page 347, from which it will be 

 seen that it bears a considerable resemblance to the New 

 Zealand species. All that is known of B. sulcatus is as 

 follows : — It has a groove along the proboscis ; it has no 

 synapticula ; it appears, from the drawing, to possess ten or 

 eleven pairs of gill-slits. This drawing is about eight times 

 natural (preserved ?) size, from which we may conclude that 

 the proboscis is about 8 mm. long and the width of the collar 

 1*5 mm., both measurements agreeing fairly well with the 

 proportions of these organs in B. otagoensis. 



It is, from consideration of geographical distribution, possible 

 that they are identical^ — there is nothing to oppose identity in 

 this respect. Nevertheless, as we know practically nothing of 

 the anatomy of B. sulcatus, I give a new name to the New 

 Zealand species, which may be characterised as follows : 



Balanoglossus otagoensis, n. sp. 



Hab., coast of Otago, New Zealand. 



The proboscis is deeply grooved along the whole of its dorsal 

 surface. The proboscis cavity extends right to the tip of the 

 organ. The longitudinal muscles of the proboscis form a very 

 narrow band close to the wall. There is but a single proboscis 

 pore. There are no median gonads. There is a single pair of 

 intestino-tegumentary canals. The arms of the subnoto- 

 chordal skeleton reach backwards to the level of the collar- 

 pore. 



I have considered it unnecessary to enter into details of 

 anatomy or histology, for these are to be found in Spengel's 



' I hear from Prof. Dendy, of Cliristcliurch, N.Z., that he has captured a 

 species of Echiurus on the coast, which agrees very closely with the peculiar 

 Japanese E. uuiciactus. 



