CRUSTACEA. 
309 
name of Ophrosctdtis from a single species which he has named Oplttoseidns 
cardioccphahis, which is about 6 mm, long and 2 broad. The cephaloii is flat, 
thin, cordiform, and produced anteriorly to a point, on which is placed the 
median eye. The pereion is nearly cylindrical and obscurely divided into 
four or five somites. The pleon is conical and terminates by a narrow pro- 
longation that is furnished with two little round plates bordered with cilia. 
The pereiopoda resemble somewhat the prehensile appendages of the genus 
Oplikotylns of the Trematodes, and consist of strong prehensile ' chelse fixed 
upon short and stout protuberances. The pleon and pereion posterior to the 
first somite are filled with ova of a proportionally large size. This species 
was found in a Botrylliis attached to a Maia squinado. The male is unknown. 
With this memoir are given two plates having forty-two figures 
illustrative of the animals, and the more important parts de- 
seribed in the eommunication. 
Kroyer, H. N. Contributions to the history of the Parasitic 
Entomostraca. Naturhistorisk Tidsskrift, Copenhagen, 
vol. vii. Nos. 2-3, pp. 75-126, 1863-4^ 
We regret that, up to the time of going to press, the memoir 
of this author has not been reeeived by us. It is, however, a 
eirciimstance of the less consequenee, sinee the June Number of 
the Annals of Natural History (1865) eontains an abstract of it ; 
by this Ave learn that it contains nearly one hundred new species, 
illustrated liy eigbteen plates. 
CIPRIPEDIA. 
Dr. Ayres states (Proc. Calif. Acad. Nat. Sc. iii. p. 60) that large masses 
of barnacles were found floating at sea in lat, 33° 8' N., long, 129° 36' W.^ 
which, instead of as usual adhering to some piece of timber, were attached to a 
spherical fleshy receptacle, apparently a portion of their own system. This 
receptacle was of a light yellowish colour, about the size of a small orange, 
which it somewhat resembled in aspect.” The cirripedes were allied to 
Anatifa {Leqms), but differ from it in the breadth of the dorsal plate, and in 
the projection of a strong keel at the base of both dorsal and lateral plates. 
SUCTOllIA. 
Prof. Lilljeborg (Ann. des. Sc. Nat. a^oI. ii. pp. 289-356), in 
a communication which he had previously published (Acta Nova 
P.('g. Soe. vSeient. Tlpsal., vol. iii. 1 862), d (‘scribes several species 
of the genera Pachyhdella, Diesing [SaemHna'^ , Tliompson] , and 
Peltogaster, Rathke. We think there can be little doubt that 
the opinion of Lilljeborg is correct, and that they must be 
considered abnormal forms of the subclass Cirripedia, and 
related to the order Apoda (Darwin) . The author proposes to 
arrange these Crustaceans as folloAvs : — 
Snendinn, Thompson, takes priority of Bachyhdclht., Diesiug. 
