 pllusks, 
2 ety of Helix have been ascertained by M.P. de Meuron to 
1884. ] Z olog: eý: 8 33 
ZOOLOGICAL RESULTS OF THE ROMANCHE EXPEDITION To CAPE 
terus, and the genus Lepidochnictys are new. Fresh-water fishes 
; are represented by Galaxias maculatus and Notothenia tessellata. 
The predominating genera of mollusks are Oscabrion, Patella and 
Mytilus. All the large species are edible. The large mussel 
oem fixed upon a stone handle, are used by the Fuegians as 
nives. 
Among the mollusks are Chitons, Volutes, Succineas and 
Chilias, many of them new, but there are no fresh-water shells, 
and only three or four small Helices. Echini, which are a value 
article of food to the F uegians in July and August (the end of 
winter) are abundant, and the starfishes include Ladidiaster radio- 
sus, which has evident relations to Brisinga, and Crenodiscus aus- 
tralis. The collection of insects is not only interesting on account 
of 1€ new species, but because of numerous forms which’ were 
ian known only from parts of South America near the 
or, 
three families Syconidz, Leuconidz and Teichonide. 
7 ae HW. Conn and H. G. Beyer (Stud. from the Biol. 
J. Hopk. Univ., 1883), describe the various nerve structures of 
Porpita, These consist of nerve ganglion cells, about 2% of an 
‘ht in diameter , usually tripolar, but sometimes bipolar, with yi 
process from each pole; and of some hundreds o 
mall €ctodermal pockets arranged around the edge of the velum. 
of «pockets are formed of much enlarged ectodermal cells, ald 
ee have a distinct nucleus and nucleolus. They wou 
to be organs of touch. fiat 
—By far the greater part, if not the whole, of the primi- 
odermal origin. The walls of these organs have all the 
eit a p ` a K ning 
“Sts of regular epithelium, there is a wide external opening, 
