Benham. — Further Notes on the Sipunculids of N.Z. 307 



been contented with the suggestion merely of the identity of the 

 Dendrostoma with Hutton's S. lutulentus. But since writing that 

 article I have received representatives of two more genera, and 

 this leads me to doubt whether even this suggestion is probable. 

 We must bear in mind that at the time Captain Hutton wrote 

 the limitations of the genera of Sipunculids were by no means 

 so clearly recognised as at the. present day ; and it is not quite 

 certain to what genus Hutton's species belongs. 



I propose, then, to name the Dendrostoma after our leading 

 naturalist in New Zealand, so that it will now stand as 

 Dendrostoma huttoni, Benham = Phascolosoma huttoni, Benham 

 (Index F.N.Z.) = Dendrostoma ceneum, Baird (Benham, Trans. 

 N.Z. Inst., xxxvi., p. 177). 



Both Baird's and Hutton's species of Sipunculus must stand 

 amongst our " species inquirendse." I much regret the confusion 

 to which my former article will perhaps give rise. 



The figure (pi. vii., fig. 12) illustrating my account* of the 

 tentacular crown of Dendrostoma huttoni does not do justice to 

 the elegance of this organ : the lobes are too broad and the ten- 

 tacles too short. I have therefore drawn another figure from a 

 fully extended specimen, which is reproduced on Plate XV., fig. 6, 

 for comparison with the corresponding organ of the genera 

 described in the present communication. 



EXPLANATION OF PLATES XV. and XVI. 



Fig. 1. Phascolosoma novai-zealandia: : half natural size. 



Fig. 2. The tentacular crown of the same : oral view ; magnified ; recon- 

 structed. 



Fig. 3. Sipunculus maoricus : natural size, a, the partially retracted 

 introvert ; b, contracted region of the body, where the circular 

 ridges are very distinct. 



Fig. 4. Tentacular crown of the same : oral view ; magnified ; recon- 

 structed. 



Fig. 5. One of the latero-dorsal ridges of the tentacular crown of the 

 same, as seen on the wall of the opened introvert : stained and 

 mounted ; the arrow indicates the anterior end of the body ; 

 (camera, magnified). 



Fig. 6. Dendrostoma huttoni : oral view of tentacular crown ; magnified. 



Fig. 7. Sipunculus maoricus : side view of the anterior end of the intro- 

 vert ; magnified, a, tuberculated region ; b, smooth region. 



Fig. 8. Phascolosoma novce-zealandice : a piece of skin from the body-wall, as 

 seen through a hand-lens, showing the characteristic papillae (p). 



Fig. 9. The same : a papilla much enlarged. 



Fig. 10. The same : a papilla in longitudinal section (camera X 80). 

 ax, axial canal ; ct, dermis ; pg, pigment granules of the outer 

 part of the dermis (the epidermis had macerated off) ; .r, cord 

 of granular material in the axial canal (? nerve or secretion). 



* Trans. N.Z. Inst., xxxvi., p. 177. 



