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round the sides of die organ, leaving only a small proximal part lined by thin epithelium. Sexes 

 separate ; the mature female showing a large yolky egg in one of its ovaries, and carrying one 

 embryo in the middle of its vestibule. Buds situated rather proximally, as many as two pairs 

 being present simultaneously; a foot-gland developed in this stage. Stalk varying in length 

 according to its degree of contraction; when stretched, as much as 16011 long and ig u broad; 

 vvhen contracted, not more than i 10 a long and accordingly broader (32 u,). The stalk has a 

 well marked disc of attachment, without foot-gland in the adult state. 



This form has a considerable resemblance to L. circitlare, of which it may indeed be 

 a dwarf variety. The number of tentacles is, however, smaller than in that species; and only 

 one embryo appears to be developed at a time. I have, moreover, only found one pair of 

 cirriform organs. These differences are, perhaps, not inconsistent with the view that it is a 

 small form of L. ciradare ; but it seems to me preferable to describe it as a distinct species. 



In size and number of tentacles the present species resembles L. shiiteri, which differs 

 from it in its narrower calyx. It is, besides, very improbable that the same species of Loxosoma 

 would occur on two "hosts" so different as a Sipunculid and a Retepore. 



Loxosoma spp. incert. 



89. B. On Retepora, 89. A. Stat. 116. West of Kwandang Bay, entrance, 72 Rletres; fine sand 



with mud. 

 150. F. On Retepora, 150. A. Stai. 204. Between Islands of Wowoni and Buton, 75 — 94 Metres; 



sand with dead shells. 

 108. AG. On Retepora, 108. B. Stat. 144. North of Salomakiëe (Damar) Island, 45 Metres; 



coral-bottom and Lithothamnion. 

 216. C. On Retepora, 216. A. Stat. 285. South coast of Timor, 34 Metres; Lithothamnion. 

 231. B. On Retepora, 231. A. Stat. 305. Solor Strait, off Kampong Menanga,_ 113 Metres; 



stony bottom. 

 410. E. On Retepora, 410. B. Stat. 305. Ibid. 

 On Retepora. Singapore, R. HAXITSCH Collection, Mus. Zool. Cambridge, Reg. Apr. 10, 1900. 



Specimens of Loxosoma were observed on the Retepora indicated above ; but as 

 microscopic preparations were not made it would be unsafe to attempt to refer them to their 

 respective species. 



8. Loxosoma troglodytes 1 ) n. sp. (PI. I, figs 17, 18). 



Type. 131 T., in compensation-sac of 131. A., Lepralia celleporoides. Stat. 164. i°42'.5 S., I30°47'.5 E., 

 32 Metres; sand, small stones and shells. (Also on mounted slides of 131. A.). 



142. D., in the same position and from the same Station (on slide 142. A., L. celleporoides). 



322. 1., in the same position, in 322. F., L. celleporoides. Stat. 50. Bay of Badjo, W. coast of 

 Flores, o — 40 Metres; "mud, sand and shells, according to locality". 



Size small. Form of the retracted animal pear-shaped, the narrower part being repre- 

 sented by the stalk, which passes almost continuously into the calyx. Total length, including 

 the stalk, about 185 — 192 fx; breadth of the calyx 102 — 109 u. The calyx bears two or more 



1) TfwyAoJüT^i;, "one who ci'eeps into holes, a cave-dweller". 



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S1BOGA-EXPEDITIE XXVUI0. 



