1898.] FEOM EOTTTSIA ANP FTINArUTI. 469 



1. SiPXTNOULUS TASTUS Sel. & Biilow. 



One specimen from Eotuma, numerous smaller specimens from 

 Funafuti. 



In the analytical key in Selenka's " Sipunculiden " ^ the number 

 of longitudinal muscles in this species is given as 31, but in the 

 description of the _species the number is 27. In the present 

 specimens the numflfr varies from 25 to 27 in different regions of 

 the body, neighbouring bands sometimes, though not very often, 

 fusing with one another. The characteristic diverticula on the 

 hind-gut are well marked. 



The numerous specimens from Funafuti are all comparatively 

 small, being about 5-7 cm. in length ; the single example from 

 Eotuma measured 16 cm. in length with its introvert retracted. 

 Mr. Grardiner reports that this species is extremely common on the 

 outer reef under the loosely cemented masses of rock. 



Besides the specimens from Eotuma and Funafuti, the species is 

 also recorded from Jaluit and Mauritius. 



2. SiPTJNCUitrs KOTUMANUS, n. sp. (Plate XXXVII. figs. 1, 2, 

 &3.) 



Eight specimens fi'om Eotuma. 



This species is closely allied to S. cumanensis Kef. and S. eclulis (?) 

 Lamarck. It, however, differs from them in having but 14 

 longitudinal muscle-strands instead of 21. It is perhaps more 

 closely allied to S. ctonanensis, but it has no dissepiments and no 

 diverticulum of the alimentary canal. 



This species is very long and slender. The largest specimens 

 are between 21 and 22 cm. in length when fully extended, and 

 vary from 1 cm. to 1*5 in breadth. Of this the introvert forms 

 perhaps -^. The skin is glistening grey, with certain blackish 

 papUlse scattered over the surface (fig. 3) ; these, however, become 

 closely and regularly arranged in rows on the proboscis. The 

 cuticle has in many places separated from the underlying skin. 

 The circular muscles are in rings with very numerous anastomoses. 

 The head has numerous (some 40-60) short pointed tentacles which 

 surround the excentrically placed mouth (fig. 1). The external 

 opening of the anus is conspicuous (fig. 2), and the brown tubes 

 open very slightly in front of it. The rectum is attached by 

 numerous strands to the body-wall. The alimentary canal has 

 many coils (30-40), and is not attached by any muscle-strands 

 except at the posterior end, where there is a spindle-muscle 

 running to the hind end of the body-wall. 



The ventral retractors are very long, half as long as the body ; 

 they take their origin from the 2nd and 3rd longitudinal muscles, 

 countmg the muscle which lies next the nerve-cord as the 1st. 

 The dorsal retractors are much shorter, not more than |, and some- 



"^ Eeisen im Archipel der Philippinen, II. Theil, iv. Band, 1 Abth. Wiesbaden, 

 1883. 



