LOXOSOMA LOXALINA AND LOXOSOMA SALTANS. 123 
think that they are hermaphrodite ; but I do not wish to 
commit myself absolutely. Figs. 3^ 4 and 6 illustrate these 
p Dints. There seems to bean anterior duct or opening (fig. 5, 
h.d.) on the epistome. Whether this is renal or reproductive 
I cannot determine. 
Muscular System. — The contractile tissue is well de- 
veloped in connection with the stalk, foot and tentacles. 
The long peduncle contains longitudinal fibres which run 
parallel with the surface between the body and the foot, and 
closely applied to the surface. At the proximal end some of 
these fibres bend across and become continuous with the walls 
of the alimentary canal. I cannot make out that they divari- 
cate in so marked a manner at the distal end in reaching the 
foot as one would expect from the condition described in L. 
annelidicola or L. Davenporti. There is a strongly 
developed circular band of fibres developed on the inner rim 
of the lophophore. 
The surface of the stalk contains longitudinal rows of 
larger cells, and one especially well-developed row extends 
down the mid-dorsal line. This also occurs in L. Daven- 
porti and others. 
LoXOSOMA SALTANS N.S. 
An allied form of Loxosoma living also in the tube of a 
Maldanid occurs farther north in the sands of the shores of 
Skye, in the neighbourhood of the Kyle of Loch Alsh, some 
three or four feet below low-water level. 
This is sufficiently different from Loxosoma loxalina of 
the Sound of Mull to deserve a different specific name, though 
it, together with L. Davenporti and L. annelidicola and 
even L. crassicauda, form a group showing special affini- 
ties. All these species live commensally with tubicolous 
PolychjBtes. The difference is distinctly indicated in the two 
figures, 1 and 20 on Pis. 0 and 7, which are drawings of typical 
specimens of the two forms after preservation. Fig. 10 gives 
a better idea of the living animal, L. saltans. The Skye 
