104 REPORT—1857. 
Notice of u curious Monstrosity of Form in the Fusus antiquus. 
By G. C. HynpMAN. 
The specimen exhibited was obtained during the present summer, by dredging off 
Groomsport, in the county Down, by Samuel Vance, Esq., and George Murray, Esq., 
and kindly presented by the former to Mr. Hyndman. Unfortunately, the animal 
was not preserved, as the specimen was boiled along with a number of other shells, 
and their contents extracted before the singular form of this shell attracted notice. 
The author had no doubt, however, in referring to it as a curious and interesting 
monstrosity of the common Fusus antiquus, although its convolute form more nearly 
resembled that of the foreign genus Delphinula, or of Euomphalus. From the pro- 
jection of two or three turns of the original apex of the shell, from the centre of the 
coil, the author considered that the abnormal form had been occasioned by some 
accident befalling the animal whilst in the young state, which obliged it to change 
the usual angle of the whorl with the central spire, and that the shell has thus 
become conyoluted as seen. 
Remarks on certain Genera of Terrestrial Isopoda. 
By Professor J. R. KINAHAN. 
These have all been included by M. Edwards under his group Cleportides, but are 
very improperly characterized, and the British species are comparatively unknown. 
A new arrangement of the genera was proposed, the characters selected as generic 
being the presence or absence of the so-called “ epimerals” of the abdominal rings, 
the state of development of the frontal and lateral lobes of the head, the form and 
characters of the terminal abdominal ring and its appendages, and the form and 
structure of the filaments of the external antenne. The following arrangement 
was suggested :—Family Ligide, genus Ligia (Brandt); family Philocide, genera 
Ligidium, Titanethes (Schiodte), Philoscia (Latreille) ; family Iteade, genera Tri- 
choniscus (Brandt)? this genus may owe its origin to imperfect means of examina- 
tion. Itea (Koch, in part) ;—this would appear to contain three genera in Koch, one 
only of which belongs to this division. Philougria (mihi), Deto (Guerin)? Porcel- 
lionide, Platyarthrus (Brandt)? Porcellio (Brandt) ; Oniscus (Latreille) ; Armadil- 
lide, Armadillo (Brandt); Armadillium (Brandt) ; Spherillo (Dana). The other 
families, Cubaride and Diploexochide, are not met with in Britain. The species met 
with in Britain are as follows: seven being new to that country ; they are all met 
with in Ireland, except P. armadilloides, of which specimens from London are in the 
British Museum collection :—Ligia oceanica ; Philoscia muscorum ; Philougria celer 
(mihi) ; Philougria, generic character,—epimerals of abdominal rings rudimentary, 
head rounded, neither lateral nor frontal lobes, last pair of abdominal false legs 
uncovered, peduncle branched, external branch of the lateral appendages subulate ; 
antenne four; internal antenne rudimentary; external antennz filament subulate, 
smooth, five-jointed, terminal joint setaceous: Porcellio scaber (Brandt); P. dila- 
tatus (Brandt); P. pictus (Brandt) ; P. levis (Latreille) ; P. pruinosus (Brandt) ; 
P. armadilloides (Lereboullet) ; P. cingendus (mihi),—body elongated, smooth or 
slightly scabrous, frontal and lateral processes rudimentary only; last abdominal 
ring triangular, acute at apex : Oniscus murarius (Cuv.) ; O. fossor (Koch ?); Arma- 
dillium officinale (Brandt). All the species are from the neighbourhood of Dublin. 
On a New Species of Galathea. By Professor J. R. KINAHAN. 
This species combined many of the characters of the genera Munida and Galathea 
as at present constituted, possessing the elongate slender claws of the former, and 
the flattened broad rostrum of the latter. This new species in characters is inter- 
mediate between the three known species. Professor Kinahan had named it Gala- 
thea Andrewsii. It is found abundantly along the east coast of Ireland, from Belfast 
to Dublin. ; 
On the Cranium of Osseous Fishes and its Vertebrate and Articulate 
Homologies. By Professor Macponaxp, M.D. 
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P, 
