I 2 



species of that genus in Malay waters. Specimens of Retepora which I refer provisionally to 

 seven species have been found to be thus infested. In many cases, the Loxosoma was only 

 discovered during the examination of a microscopic preparation of the Retepore ; and it cannot 

 be doubted that I have failed to detect it on many specimens on which it is really present ; 

 although in examining the numerous Retepores in the collection I have throughout looked for 

 Loxosoma. My evidence goes to show that there is no restriction of a particular species of 

 Loxosoma to one species of Retepora; and the same species of "host" may bear more than 

 one species of Loxosoma. In the majority of cases the Entoproct is not the only commensal 

 organism, the Retepora being infested simultaneously with a Gymnoblastic Hydroid, with an 

 elongated hypostome bearing diffusely arranged tentacles. From the fact that this Hydroid 

 produces buds which appear to be destined to break off as free Medusae I refer it to the 

 genus Syncoryne. I have already called attention to the occurrence of the Loxosoma and 

 Syncoryne on Retepores in my Presidential Address to Section D at the Dublin meeting of 

 the British Association l ). The Loxosoma is most commonly found on the frontal side of the 

 Retepore; but the specimens 337. J., which I have selected as the types of L. cirriferum, 

 occurred mostly on the basal sides or backs of the branches. I have usually, though not 

 always, found the Entoprocts on parts of the Retepores in which the polypides were in full 

 functional activity. 



Most of the other species of Loxosoma appear to have an even number of tentacles. 

 In L. annulatum I have, however, counted nine with certainty in several specimens, and I have 

 been able to ascertain that the odd tentacle is situated distally. In one case there appear to 

 be 1 1 tentacles. 



The stalk varies in length more than in most species. The extreme measurements which 

 I have made are 166 u. and 454 >j.. lts breadth is considerable, and may be as much as 51 >j.. 

 The robust stalk and the rather narrow calyx give this species a very different appearance 

 from L. circulare, for instance. 



In most species of Loxosoma the old bud is attached to the parent by the tip of its 

 stalk. In the present species the tip is prolonged beyond the point of attachment ; a feature 

 which was described by Claparède 3 ) and confirmed by Nitschk : ') in L. kefersteinii. I have 

 had some difficulty in deciding how the foot-gland of the bud is related to this prolonged tip; 

 but the evidence of 247. E. seems to show that the attachment of the bud is at first quite 

 normal (fig. 3), the foot-gland running from the point of attachment, along the oral side of 

 the stalk, to the commencement of the calyx. At this region there is at first an indentation 

 between the stalk and the calyx ; but this soon disappears, and the opposite end of the stalk 

 begins to grow towards the lophophoral end of the parent. The attachment or "umbilicus" of 

 the bud then lies on that side of its stalk which is opposite to the surface containing the last 

 remains of its foot-gland (figs. 4, 5). 



ij Harmer, S. F., 1909, Report Brit. Ass., Dublin Meeting, 1908, p. 721. 



2) 1 ! .1 u ini. E., 1870, "Beitr. Anat. u. Entw. d. Seebryozoen", Zeitsch. wiss. Zool., XXI, p. 171, PI. X, tig. 4. 



3) Nitsche, 11., 1875. "Bau u. Knospung v. Loxosoma ktl\i sicinii'\ Ibid., XXV, p. 454; and 1S75, "t'eb. d. Knospung d. 

 1 !.. XXV, Suppl. Bd, p. 37(1, PI. XXV, iig. 4. 



