CRUSTACEA. 
307 
The first pair of appendages consist of two three-jointed branches on a 
strong basal joint; the shorter branch terminates in a small hook, the longer 
in several small points, and may be compared with the form of the feet of 
Sjylanchnotrophus, described by Hancock and Norman. After these feet the 
greatest peculiarity is in the form of the body of the female. The central 
portion, corresponding to the three middle somites of the pereion, rises on the 
dorsal surface into a globular form much resembling the shell on the back of a 
snail, beneath which the cephalopereion (Kopf bruststuck) and pleon are some- 
what compressed on the ventral surface. The large dorsal globular space 
is filled with a considerable number of ova, which are in a more or less 
advanced state. Prof. Claus does not consider these Crustacea to be true para- 
sites, existing on and sucking the juices of the animal on which they live, 
but merely occupants similar to the Pinnoterce which dwell within the shell 
of bivalve mollusca. 
We have not seen Costa’s figure, alluded to ; but if it resembles at all that 
given by Prof. Claus, then it cannot belong to Noiopierophorm as described 
and figured by M. TIessc in the Ann. Sc. Nat. 18G4, i. p. 338, of which we 
shall have to speak further on. 
Chondracanthid^. 
Mr. Hancock and the Rev. A. M. Norman have described 
(Trans. Linn. Soc. vol. xxiv, p. 49) P^planchnotroiilius, an entirely 
new genus of Crustacea, of the family Chondi'acanthidoi. The 
animals are subinternal parasites, lying buried within the vis- 
ceral chamber of their victims ; but with the caudal extremity 
and ovigerous sacs of the female exposed on the external surface* 
The characters of the genus are as follows : 
Femince cephalopereion uni- vel bi-annulatum, appendicibus utrinque elon- 
gatis, simplicibus, cylindricis instructum. Antennae primae minutae ; secimdae 
majores, prehensiles. IMaxillipedes cum mandibulis raaxillisque juxta os 
positi. Pedum pereionum tluo paria non natatoria, unguiculata. Pleon 
biannulatum ; annulus posterior appendicibus caudalibus stiligeris confectus. 
Ova externa, in sacculos ellipticos aggregata. Mas perpusillus, a femina 
cephalopereione quadriannulato, appendicibus lateralibus carente diflert. 
The authors describe two species, Splanchnotroplim gracilis, found on Doris 
pilosa, and Splanchnotrophus hrevipes, found on Doto coronata and Foils raji- 
hranchialis. 
M. Hesse, in his third article on rare or new Crustacea of the 
French coast (Ann. des Sci. Nat. ser. 5. vol. i. p. 333, pi. 11, 12), 
describes some new species and genera which inhabit tlie interior 
of the Ascidians. 
Among them is a new species of Notopterophorus, to which he has given 
the name of Notopterophorus papilio, a name that is singularly appropriate 
from the large flat wing-like plates attached to the basal joints of the legs 
ai)d which spread themselyes out on the dorsal surface of the animal. 
A new genus, to which he gives the name of PolycUniopJiile, he describes 
at length from the character of the species Polycliniophile corisoformis, 
from which the following is abbreviated. It is 1 mm. long and ^ mm. broad. 
x 2 
