I I 



individuals which occur at the anterior end of the Phascolion and those which are found on 

 its posterior end. 



It may be useful to note a few other references to the occurrence of Loxosoma on 

 Sipunculids, and particularly on Phascolion. Besides the records of L. phascolosomatum on 

 Phascolosoma the following may be mentioned : 



L. phascolosomatum , found on Phascolion by Andersson J ) in E. Greenland and by 

 Norman ' 2 ) in E. Finmark. 



Loxosoma sp., found on Phascolion by Marion 3 ) at Marseilles; by Levinsen 4 ) in the 

 Kara Sea: and by Théel 5 ) in the Gullmarfjord, S.W. Sweden : on Phascolosoma by Verrill i; ) 

 on the Atlantic Coast of the United States ; and on Phascolosoma australe by Whitelegge 7 ) 

 in Port Jackson. 



3. Loxosoma anuulatum n. sp. (PI. I, ligs 2 — 6). 



Type. 195. D. On Retepora, 195. A., Stat. 274. 5 28.2 S., 134 53.9 E., 57 Metres; sand and shells, 

 stones. 

 24. E. On Retepora, 24. A., Stat. 53. Bay of Nangamessi, Sumba, o — 36 Metres; coral-sand ; 



near the shore, mud. (On Mimosella tennis slides, 24. C. 2 , 24. C. 3 ). 

 133. H. On Retepora, 133. B., Stat. 164. I°42'.S S., I30°47'.5 E., 32 Metres; sand, small stones 



and shells. 

 247. E. On Retepora, 247. A., Stat. 310. 8° 30' S., U9°7'.5E., 73 Metres; sand and dead coral. 

 [For other specimens which appear to belong to this species, see below, p. 13]. 



Calyx rather small relatively to the stalk, usually from 140 to 190 \i. long and 100 to 

 1 30 u. broad ; somewhat broader distally than proximally, where it passes continuously into the 

 stalk, without a sudden diminution in breadth. Cirriform organs small, usually one pair, opposite 

 the distal end of the stomach (fig. 2) ; occasionally one or two cirri on the more distal part 

 of the calyx. Tentacles 9, with an unpaired distal tentacle ; rarely 11. Stomach without lateral 

 lobes. Gonads ? Buds usually on one side of the calyx only, not more than two at a time, the 

 tip of the stalk prolonged beyond the attachment to the parent in the old state. Stalk varying 

 greatly in length, but always longer than the calyx, sometimes more than three times as long; 

 broader, relatively to the calyx, than in other species found on Retepora, conspicuously annu- 

 lated, without foot-gland, which is, however, present in the buds. 



The specific name refers to the annulated character of the stalk : — a feature which 

 may be due to contraction, but is not seen in the other species, similarly preserved. 



I am not acquainted with previous records 8 ) of the occurrence of Loxosoma on Retepora \ 

 but, judging from the evidence of the 'Siboga' Collection, it must be extremely common on 



1) Andersson, K. A., 1902, "Bry. schwed. Exp.", Zool. Jahrb. Syst., XVI. p. 555. 



2) Norman. A. M., 1903, "Notes Nat. Hist. E. Finmark", Ann. Mag. Nat. Hist. (7) XI, p. 574. 



3) Marion, A. F., 1879. "Drag. Marseille", Ann. Sci. Nat., Zool. (6) VIII, p. 33. 



4) Levinsen, G. M. R.. 1S86, "Bry. Kara-Havet", Dijmphna-Togtets zool.-bot. Udb., p. 327. 



5) Théel, H., 1907, "Sver. Zool. Hafsstatiou Kristineberg", Ark. f. Zool.. IV. p. 71. 



6) Verrill, A. E., 1879, "Prelim. Check-List Mar. Inv.", Prepared for the U.S. Comm. of Fish and Fisheries, Author's Edition, 

 New Haven, p. 31. 



7) Whitelegge, T., 1890, "List Mar. and Fresh-water Fauna Port Jackson", J. Proc. Roy. Soc. N. S. Wales, XXIII, p. 131. 



8) Except my own preliminary notice, referred to on p. 12. 



11 



