On examining the specimens of the Crinoid Hathrometra (Antedon) 

 prolixa (Sladen) brought home by the Danmark-Expedition 

 (from Station 99; IT Lat. N. 171/2° Long. W., 300 m.; 22/VII 1908) I 

 found attached to their cirri, besides a number of Hydroids a. o. 

 small animals, several specimens of a species of Loxosoma (Cf. Re- 

 port on the Echinoderms collected by the Danmark Expedition at 

 North-East Greenland. Medd. om Grønland. XLV. 1910. p. 244). As 

 was suggested in the place quoted it represents a new species, 

 which I shall describe here under the name of 



Loxosomella^ antedoiiis n. sp. 



The shape of the animal is seen from PI. XXVI Figs. 1 — 5. The 

 calyx is beautifully oval, without expansions on the sides; it passes 

 very gradually into the stalk, which is simply cylindrical, slightly 

 narrowing towards the base. The length of the stalk is somewhat 

 variable, from a little shorter to a little longer than the length of 

 the calj'x (Figs. 2, 4). The total length of the animal is 0,5 — 1 mm. 

 Generally the stalk is curved, the animal bending its atrial opening 

 towards the cirrus to which it is attached. (Figs. 1, 5). 



The number of the tentacles is 14 or 16; I have been unable to 

 observe with certainty whether there are tentacles developed at the 

 anterior border of the atrium, off the mouth opening; I think there 

 is not, and then the normal number of tentacles will be 14. 



The stalk does not contain any foot gland, while in the buds 

 there is a distinct gland (Fig. 2). This gland after having secreted 

 a finely granular substance, b}^ which the animal fixes itself, atro- 

 phies completely so as to leave no trace at all in the grown speci- 

 mens. (Fig. 9). In a few specimens I have observed a similar linear 

 arrangement of nuclei in the stalk as that figured by Salensky in 

 Loxosoma crassicauda (Etudes sur les Bryozoaires entoproctes. Ann. 

 Sc. nat. 6. Sér. V. 1877 Zoologie. PI. 13. Fig. 12). I do not, however, 



' Regarding the name Loxosomella see below, p. 405. 



29* 



