402 Ти- Mortensen. 



is the upper part of the foot-gland; he thinks it produces the con- 

 nective tissue of the stalk and that it is the homologue of the pecu- 

 liar umbilical cells of L. Kefersteinii, which form the attachment of 

 the buds in that species. The fact that the buds of L. phascoloma- 

 tum are attached by the end of the stalk does not lend support to 

 Vogt's suggestion. I think, there can be no doubt that the "corps 

 pédieux" of this species is really the widened upper end of the foot- 

 gland as in L. antedonis, representing the secretory part of the gland, 

 the lower part being the duct. 



There seems to me no reason to enter on a detailed description 

 of the development of the buds, partly because the preserved mate- 

 rial is not sufficient for a detailed study of this development, partly 

 because the facts observed indicate that the species does not show 

 any more noteworthy differences herein from what has been made 

 known for other species of Loxosoma. It should only be pointed 

 out that the buds are attached with the end of the stalk as in most 

 of the other species, but contrary to what obtains in L. Kefersteinii. 



Whether the species is bound to the habitat on the cirri of the 

 Crinoids I am unable to say; in any case it as yet not known to 

 occur on any other host. 



This species, which is the first Loxosoma observed on any Echi- 

 noderm, so far as I am aware, appears to be nearly related to L. 

 crassicauda Salensky; especially it is noteworthy tliat the structure 

 of tlie foot is the same. Of its specific difference from that spe- 

 cies there can, on the other hand, be no doubt; as more prominent 

 differences may be pointed out: the greater number of buds in 

 crassicauda and the more numerous gland cells; also the shape of 

 tlie foot-gland in tlie buds of L. crassicauda is different from that of 

 L. antedonis. Another species showing affinities to the present species 

 is L. phascolomatum Vogt, and probably the relation between the 

 latter species and L. antedonis is more close than with L. crassicauda. 

 Tlie great length of the foot and its peculiar bisected extremity in 

 L. phascolomatum are the more prominent differences between the 

 two species, besides, of course, the very different habitat. 



The species Loxosoma claviforme Hincks (British Marine Polyzoa. 

 PI. 81. Figs. 9 — 11) shows a considerable likeness to L. antedonis in 

 general shape. Though it is quite insulficiently known it can, how- 

 ever, not be doubted that it has really nothing to do with the 

 species here described. The peduncle is described as "terminating 

 below in a short, foot-like expansion", which also appears from the 

 figs. 9 a. and 11. This would indicate that it is related to such 

 forms as L. raja Schmidt; Harmer (Op. cit. p. 263) identifies it 



