Gatty Marine Laboratory, St. Andrews. 19 
were about the length of the dorsal lamellz. There were 
no hooked bristles, and the ventral division of the foot has 
no hollow. An anal sucker. The first species 1s Nerinides 
longirostris, De Quatrefages, from Blacksod Bay (Southern). 
The head is acutely pointed, with a median ridge, 
which runs backward to the third segment, on which four 
eyes in a square are placed, and the sides have a flattened 
process (peristomiuin), from which project a pair of short 
tentacles of a golden-yellow colour, and these when separated 
retain vitality for three days (De St. Joseph). Beneath 
them is a ciliated groove with pigment-granules, and possibly 
with urticating elements (De St. Joseph). The tentacles, 
as in allied forms, aid in procuring nourishment. body 
10 em. long and 8 mm. broad, slightly tapered anteriorly, 
and more so posteriorly, where it ends in a dorsal anus 
with a multilobed ciliated border not surrounded by cirri. 
The colour is rose-red anteriorly (probably from the blood- 
vessels), but from the fortieth segment, or thereabout, the 
posterior region is dull green, almost blackish, but near 
the vent the intestine is yellowish, and is usually filled with 
Rissoa parva. The first segment carries a branchia, and has 
a dorsal and a ventral division with bristles. There are two 
lamellee, the posterior larger than in WN. foliosa and bordering 
the branchia. Behind the anterior lamella is a flattened 
disc with a tuft of bristles similar to the inferior lamella, 
but longer. From the thirty-third to the forty-fifth segment, 
according to the size of the individual, the inferior division 
bears two or three bifid and hooded hooks, which by-and-by 
increase in number to about twenty, and at the ventral 
border a few wingless capillary bristles. Simultaneously, 
the posterior lamella forms a margin only to the first part 
of the branchia, which also is smaller. The feebly winged 
bristles persist to the posterior end in the dorsal division, 
but without accompanying hooks. In the last twelve or 
thirteen segments the branchiz progressively diminish and 
disappear. 
Mesnil and Caullery * (1917) describe this species as dimor- 
phic, some eggs developing to typical Spionid larvae, whilst 
others in the spawn-mass develop directly without a pelagic 
stage. Moreover, in the latter case cannibalism occurs, the 
authors assigning the title adelphophagy to the condition 
(the poecilogony of Guard). De St. Joseph met with 
Trichodina pediculus as a parasite on the branchiz ; whilst in 
the interior of the branchiz and the tentacles he found 
* Compt. Kend, clxy. p. 284. 
