A new species of Entoprocta from North-East Greenland. 403 



provisionally with L. singulare Kef., which seems not very probable, 

 the foot of this latter species forming a round sucking disk. The 

 habitat of L. clauiforme [on Hermione hystrix, shallow water; Guern- 

 sey) does not indicate any nearer relation to L. antedonis either. 



The three species named, L. crassicauda, phascolosomahim and 

 antedonis would appear to form a separate group among the species 

 referred to the genus Loxosoma ; they agree in having special sense- 

 organs, and especially in the important feature that a foot-gland is 

 present only in the buds, atrophying after having secreted a sub- 

 stance through which the animal becomes fixed for life; the muscu- 

 lature is accordingly only feebly developed, consisting only of 

 straight, longitudinal muscles. — The same is the case also in L. 

 Kefersteinii Ciaparède; however, the peculiar fact that the buds are 

 not attached by the base of the foot but by some umbilical cells, 

 the foot developing transversally to the longitudinal axis of the bud, 

 лvould appear to entitle this species to a separate position within 

 the genus. 



In connection herewith I would suggest that among the species 

 referred to Loxosoma other groups may be distinguished. The two 

 species L. annelidicola (v. Ben. & Hesse) and Davenporti Nickerson 

 agree in the total lacking of the footgland, both in the grown spe- 

 cies and in the buds; (the presence of special gland-cells in the foot 

 disk is a different thing; they can scarcely be regarded as homologues 

 of the foot-gland in the other species); the base of the foot is devel- 

 oped as a sucking disk, the musculature consisting of both straight 

 and oblique fibres, and the animal is thus not lixed for life but can 

 change its position. Also the shape of the body is alike, being more 

 or less winglike expanded; this is, however, probably of minor impor- 

 tance, as it appears to be not constant in L. Davenporti and also in L. raja 

 Schmidt, which is not more nearly related to these species, the body 

 is similarly expanded. More importance might be ascribed to the struc- 

 ture of the excretory organs; according to Prouho and Nickerson these 

 two species have the excretory organs built on quite a different plan 

 from that described by Harmer for L. crassicauda (Op. cit. PI. XX. 

 Fig. 17); in the latter species it is an intracellular tub.ule terminated 

 by a flame cell, while in annelidicola and Davenporti it is described 

 as being composed of vacuolated cells, which are not pierced by an 

 intracellular canal. The discrepancy between these two statements 

 one might suppose to be due, not to erroneous observation on one 

 or the other part, but to these species really having their excretory 

 organs thus differently built. This, however, appears not to be the 

 case. G. Stiasny (Beitrag zur Kenntnis des Exkretionsapparates der 

 Entoprocta. Arb. Zool. Inst. Wien. XV. 1905. p. 183—194) has most 



