REVIEWS. 
Transactions of the Linnean Society. 
In the last Part of the ‘Linnean Transactions ’* are several 
papers of considerable interest to the microscopical observer. 
I. The first paper in the Part is one by A. Hancock and 
the Rev. Al. M. Norman, ‘On Splanchnotrophus, an unde- 
scribed Genus of Crustacea, parasitic in Nudibranchiate 
Mollusca.’ 
In their ‘Monograph of the British Nudibranchiate Mol- 
lusea,’?’ Messrs. Alder and Hancock noticed three or four 
forms of Entomostraca found infesting the Nudibranchs; 
but partly from want of sufficient materials at the time and 
for other reasons the subject of these parasites was not pur- 
sued. Having recently, however, obtained a fresh supply of 
specimens of two of the forms, Mr. Hancock and Mr. Norman 
proceed to give as complete a description of them as they are 
able from the limited number of specimens at their com- 
mand. 
Some of these parasitic crustacea, one species of which is 
figured in the above monograph, in Pl. XLV, fig. 10, and 
which was taken in Antiopa cristata, and referred to the 
genus Ergasilus, though subsequently constituted by Leydig 
into a distinct genus Doridicola, are active little beings, 
“which flit about from place to place on the surface of the 
infested animals, or anchor themselves by their long pre- 
hensile antenne amidst the gills of Doris, or the papille of 
Eolis.” 
But the subjects of the present paper are not these agile, 
sprightly forms, but certain ill-formed and monstrous-look- 
ing creatures, which live constantly attached to one place, 
and are almost motionless. 
“Two species of these curious animals have occurred. 
* Vol. xxiv, Part 2. 1863.- 
