569 
Monday , 7 th April 1862. 
The very Rev. DEAN RAMSAY, V.P., in the Chair, 
The following Communications were read : — 
1. On the Structure of Lerneopoda Dalmanni , with Observa- 
tions on its Larval Form. By Wm. Turner, M.B. (Lond.), 
and H. S. Wilson, M.D., Demonstrators of Anatomy. 
This apparently little known form of parasitic crustacean has 
been as yet described only by Retzius and Kroyer. It does not 
appear, up to this time, to have been recognised as a British species. 
During the present year, many specimens obtained from the nasal 
cavity of more than one Rasa batis , caught by the Newhaven fisher- 
men, have been examined by the authors. 
Female . — One of the largest of the Lerneadse, divided into cephalo- 
thorax and abdomen by a constricted neck. Cephalo-thorax r \ths 
of an inch long ; it projected almost at a right angle from the 
anterior end of the abdomen. On its dorsal surface were a pair of 
3-jointed hooked antennse. In front of the antennae, and close 
to the anterior end of the head, was the buccal apparatus. Situated 
in the middle line was a short, conical, retractile snout, which pos- 
sessed an oral aperture bounded by two fringed lips at its extremity. 
The structure of these lips, with that of the jaws and palpaa con- 
nected to them, was then fully described. On each side of the 
snout is a short stump-like process — a modified foot. It was seg- 
mented, and possessed a bifid, free extremity, the posterior division 
of which was armed with a terminal hook ; the anterior division, 
much larger than the posterior, was studded with short bristles. 
Connected to the base of each stump-like process was a segmented 
palp-like structure, set with three or four conical papillae at its free 
end. 
Springing from the sides of the cephalo-thorax, immediately in 
front of the neck, was a pair of elongated cylindrical arms. Each 
arm ended superiorly in an expanded clasper. The two claspers 
were in close contact by flattened, opposed surfaces, but not united 
together. In the concave upper surface of the opposed claspers a 
cartilaginous-like bar was placed. The authors then described the 
