12 THE VOYAGE OF H.M.S. CHALLENGER. 



Habitat. — (a) Kerguelen, January 21, 1874, Cape Maclear ; 30 fathoms (three 

 specimens). 

 (6) Kerguelen, Station 149h, January 29, 1874, Cumberknd Bay ; 127 



fathoms (numerous specimens), 

 (c) Kerguelen, 10 to 100 fathoms (one specimen). 

 The largest specimen measured in its extended state 3(5 mm., including the proboscis. 



B. Four Retractor Muscles. Nq^ Hooks on the Proboscis.^ ' 



9. Phascolosoma capense, Teuscher. 



Phascolosnma capense, Teuscher, Notiz iiber Sipimculus nnd Phascolosoma, .Jenaische Zeitschr. 



f. Naturwiss., Jena, Bd. viii. pp. 498, 499, Taf. xix. figs. 4.^, 12 and 14, 1884. 

 Phasenlosovia capense, Seleuka and de Man, Die Sipunculiden, &c. {loc. eit.), pp. 29, 30, Taf. iii. 



ligs. 40-43, 1883. 



Of this species a great number of specimens are preserved ; they vary from 20 to 

 35 mm. in length, not including the proboscis. 



The body is four to eight times as long as it is broad. The proljoscis measures about 

 three-cpiarters of the length of the body. The skin is firm and somewhat shining. Even 

 with the unaided eye one can recognise the numerous dark papillae, which attain a height 

 of 0"1 mm., and cover both the body and the proboscis. The ventral retractors of the 

 proboscis spring from the middle third of the body, while those which are dorsal are at 

 some distance from these, and spring from the anterior third. On the oesophagus there 

 lies a long contractile tube bearing villi. The twisted intestine has about twenty double 

 coils, and there is only a short anterior spindle-shaped muscle. There are three fixing 

 muscles for the intestine. 



Habitat. — Sea Point, near Cape Town ; shallow water. November 1873. 



C. Two Retractors. No Hooks on the Proboscis. 



10. Phascolosoma jyrioki, Sluiter. 



Phascolosoma prioJii, Sluiter, Beitriige zur Kenntniss der Gepliyreen aus dem Malayischen 

 Archipel, Natuurkundig Tijdschrift van Nederlandsch Indie, Bd. xli. p. 1.52, Taf. i. 

 figs. 5-9, Batavia, 1881. 



Skin thin and smooth, without papillse. The body is rather long and narrow, and the 

 proboscis is longer than the body. The two retractors of the proboscis have their origin 

 far back in the body. The spindle-shaped muscle is but slightly developed, but there 

 are numerous muscles fixing the intestine. 



' The presence or absence of these prohoscal hooks is a distinctive character for most of the species of the genera — 

 Phascolosoma, Phymosoma, and Phascolion. But since the hooka sometimes fall off entirely, too niucli stress must not 

 be laid upon this specific difference. In no case, however, is the presence or absence of hooks on the proboscis a 

 distinction between "cnera. 



