Miscellaneous. 331 
Ile du Loch and of the Ile St. Nicolas, contain two fine species of 
the genus Balanoglossus, which differ at the first glance in the 
breadth and colour of the branchio-genital region. One of them is 
of an orange-yellow in the male sex, of a greyish yellow in the 
female, and of a light brown in the immature animal; this the 
author names Balanoglossus Robinw. The other species, which is 
rather more slender and much narrower in the thoracic region, is of a 
salmon-colour, brighter in the female, more delicate in the male, 
and of a dull rose-colour in the asexual animal; the author calls 
this B. salmoneus. : 
These two forms appear to be allied to B. awrantiacus, found by 
Leidy at Atlantic City associated with Solen ensis, Donax fossor, and 
various Annelids of the genera Clymene and Gilycera; andthe Bala- 
noglosst of the Iles Glénans live in the midst of a similar fauna. 
They are very abundant ; and although it is difficult to obtain them 
entire from their great length (a metre and more) and extreme 
fragility, their position is easily discovered by the coils of sand of 
peculiar form which they throw up. ‘They are to be reached at all 
times of the tide, especially B. salmoneus, which comes nearest to 
the shore. 
The posterior extremity, which is nearest to the sand-coil, is the 
most easily extracted ; it exactly resembles the intestine of a Spa- 
tangus filled with fine sand. The anterior extremity is obtained 
with more difficulty; it is folded several times upon itself, and 
covered with a mucus of very peculiar odour. ‘The lateral margins 
of the thoracic region are raised dorsally to form a sort of tube, at 
the bottom of which, chiefiy in B. Robinii, is found the parasite now 
to be noticed. 
This Annelid would at once be referred to the Nereid group; but 
it presents more of the essential characters of the family Lycoridea., 
The body is cylindrical, slightly flattened, and feebly attenuated at 
the hinder part. The central region is traversed by a median fur- 
row, which widens towards the cephalic extremity. The length of 
the animal is from 40 to 60 millim., its breadth (with the feet) 
from 5 to 9 millim. Its colour is a fine orange-yellow, tinged with 
fulvous on the feet. 
The cephalic lobe is rectangular, twice as broad as long, and 
slightly emarginate in front. The tentacles are equal in length to 
the cephalic lobe, and three in number ; the palpi, a little shorter 
than the tentacles, are inserted in two little lateral notches. There 
are four-eyes, the two anterior larger and crescentiform. 
The proboscis is entirely unarmed ; the buccal aperture is quad- 
rangular ; the buccal segment differs but little from the succeeding 
ones; the tentacular cirri are of moderate size, placed at some dis- 
tance from the lateral margins of the cephalic lobe, and probably 
six (in two groups of three) on each side. 
The feet are all similar; the parapodia composed of two distinct 
and nearly equal rami. The upper ramus is furnished with a single 
ligula (the lower one) and armed with simple capillary sete. The 
lower ramus is furnished with two bundles of sete arranged on the 
