KEPORT ON THE GEPHYKEA. 17 



0"08 mm. long hy 0'02o mm. lu'oacl ; on other part.s of the l)o(ly tliey are wholl)- alisent. 

 There is only one retractor to the proboscis. The intestinal spiral has about twenty-three 

 coUs. The animal makes tubes in the mud. 



Two of the three specimens were examined. The length of the largest was 30 mm., 

 with proboscis wholly retracted. The thin transparent skin of tlic body was not 

 coloured, the zone round about tlie anus was light brown. 



'Hooks on the proboscis absent. The tentacles are short and small. As in the other 

 species of PhascoUon, the tentacles are few in number, at most sixteen. The single 

 retractor of the proboscis originates just in front of the hind end of the l)ody, and 

 possesses several diverging roots. Far back in tlie body, where the (esophagus passes 

 into the intestine, the latter is attached by one fixing muscle. There are, however, some 

 other fixing muscles on the threefold loops of the intestine and on the rectum. 



The single segmental organ is on the right side of the body. It lies close beliind the 

 anus, and is throughout its whole length bound by connective tissue bands to the inner 

 body-wall. 



This species is distinctly characterised by the large number of intestinal coils ami by 

 the nature of the skin glands. 



Hahitaf. — The animals were found in two localities near one another. 



(a) Station 157, March 3, 1874; lat. 53° 55' S., long. 108° 35' E. ; depth, 



1950 fathoms ; Diatom ooze ; bottom temperature, 32°"1 ; trawled. (Two 



specimens with thick mud tubes.) 



{!>) Station 156, February 26, 1874 ; lat. 62° 26' S., long. 95° 44' E. ; depth, 1975 



fathoms; Diatom ooze; trawled. (One specimen and several mud tubes.) 



16. PhascoUon tubicola, Verrill. 



PhascoUon tubicola, Verrill, Kesults of Recent Dredging Expeditions on the Coast of Xew 

 England, Anier. Journ. Sci. and Arts, ser. 3, vol. v., 1873, p. 99 (note) ; see also Explora- 

 tions of Casco Bay by the U.S. Fish Commission in 1873, Proc. Amer. Assoc. Adv. Sci., 

 22nd meeting, 1874, pp. 388, 389. 



PhascoUon tubicola, Seleuka and de Man, Die Sipunculiden, &c., pp. 24, 25, Taf. vi. tigs. S0-8C. 



Body extended. Proboscis longer than the body. The whole body is covered with 

 papillse, which are small on the anterior portion of the proboscis and on the posterior 

 half of the body, but are larger in other regions. On the posterior third of the body, 

 with the exception of a short strip at the very end, there is a zone of irregularly- 

 scattered, triangular, yellowish-red prickles, with their points directed forwards. The 

 proboscis bears a few brownish, pointed, unbent hooks which measure 0-06 mm. in length. 

 There is a circle of from ten to twenty tentacles round about the mouth. Two retracto- 

 muscles, a thin ventral one and a thicker stronger dorsal one, are inserted with broad 

 roots near the hind end of the body, and are not united till they have run well forwards. 



(ZOOL. CHALL. E.KP.— PART XX.XVI.— 188.5.) Nh 3 



