the Memoirs on Loxosoma. 
395 
As my figure of Loxosoma raja is also true to nature, and the 
mature buds of the latter always already possess the full num¬ 
ber (ten) of tentacles, and transitions were never observed by 
me, no further objection to the distinctness of these two species 
will probably be made. 
L. neapolitanum must remain as it is until it has been re¬ 
discovered. I do not believe in the suctorial adhesive organs 
which Kowalevsky describes at the pedal extremity. At any 
rate it belongs to the forms with the pedal glands remarkably 
developed throughout life. 
L. pes may be hereafter the name of the species in which I 
thought I recognized L. singulare. That this is not the case 
has been shown to be exceedingly probable by Nitsche. I 
should regard it as perfectly certain, if it were actually esta¬ 
blished that Keferstein’s species possesses no pedal gland in 
the adult state. In the species found by me at Naples it is 
extraordinarily developed. The specific name is justified by 
the striking similarity of the form of the end of the stem to 
that of the human foot. It has only to be remarked that the 
true extremity, the point of the foot, is turned towards the 
dorsal surface of the animal. 
L. singulare. —This species also requires a fresh investiga¬ 
tion. Its distinctness with relation to the preceding species, 
or rather vice versa , will no longer be doubtful if the atrophy 
of the pedal glands with advancing age be confirmed. Ac¬ 
cording to Keferstein’s figure, the stem ends in a disk. With 
regard to the buds he says, u In a specimen 4 millims. in 
diameter I saw on the outer integument an oval body mea¬ 
suring 004 millim. seated like a bud; and on the same speci¬ 
men one measuring 02 millim. was attached to the outer 
integument by its stem-foot.” As in the multigemmous 
species mature buds are never found without younger ones 
standing by their side, Loxosoma singulare will certainly 
belong to the species which push forth only one bud at time. 
L. tethyce has constantly twelve tentacles. The greatest 
breadth falls in the middle of the tentacular disk. The body 
narrows towards the peduncle, so that the walls of the stomach 
are closely embraced by the integuments of the body. A fur¬ 
ther peculiarity, overlooked by Salensky in consequence of 
the want of species for comparison, is the unusual length of 
the peduncle, which attains from four to six times the length 
of the body. I obtained in Naples a middle-sized Tet/iya , 
among the villosities of which some thousand of this Loxosoma 
were seated. 
L. raja .—The outline of this species which I have given 
in my memoir is perfectly true to nature. Variations in the 
28* 
