286 
ZOOLOGICAL LITEllATURE. 
variations of the branchial appendages, and a description of 
certain anomalous organs that he regards as eyes. These are 
eight in number, of which four are paired and situated in the 
coxae (Rodleddet *) of the second and seventh pairs of thoracic 
feet'i considering Prof. Sars counts eight pairs, we think that 
they are identical with the second pair of gnathopoda and the 
fourth pair of pereiopoda. The four other of these organs are 
single, and situated in the median ventral line of the four first 
somites of the pereion. He describes them as being of a 
spherical shape, and consisting of a convex or almost semi- 
globular projection beneath the transparent skin. He agrees 
with Kroyer that they may be divided into two parts, an upper 
and a lower. They are of a firm and elastic nature, and shine 
through their capsules, especially the lower half; but Kroyer 
does not believe them to be eyes, because the species of Thy- 
sanopoda are already provided with organs of vision. 
In a supplement to the preceding account. Prof. Sars enters 
more fully into the nature of the remarkable organs of sense 
situated on the body of the Thysanopoda, and describes more- 
over the characters of two new species, viz. Thysanopoda 
r as chit and Th. 7iana. 
In these species the peculiar and anomalous organs are pre- 
sent in all respects as in Th. norvegica. They have been ob- 
served by Prof. Dana in the genus Euphausia, and described 
by him as glands. But Prof. Sars contends that they are eyes, 
and considers that he has got over one of the objections raised 
by Kroyer against that opinion by showing the presence of a 
bright-hued pigment ” in living specimens. Two pairs of similar 
organs have also been observed in a segment of the body of the 
genus Polyophthalmus of Quatrefages. 
Hr. G. O. Sars (Oversigt af de i Christianiafjorden forekom- 
mend Mysidcr, p. 240, being a supplement to a memoir entitled 
Beretning om en i Sommeren 1863 foretagen Zool. Reise, 
in Nyt Mag. for Naturv.), who has directed much attention 
towards the, Crustacea existing in the fjords of Christiania, de- 
scribes some new species of Mysidas which he has found there, 
and adds to the family two new genera, classifying them as 
follows ; — 
Mysis (Latr.). 
a. Lamina caudalis media (telson) apice fisso. 
1. (MUller). — 2. M. merm/s (Ratlike), being synonymous 
with M. cornuta (Kr. Nat. Hist. Tidsk. 3 dec. Rsekke 1, p. 20). — 3. M. trimca- 
tula, sp. n. — 4. M. ornata, sp. n. — 5. M. aurardia, sp. n. (il/. lamornce, Goes, 
nec Norman). — 6. M. insig7iisj sp. n. 
b. Lamina caudalis media (telson) apice integro. 
7. My SIS vulyai'is (Thompson).— 8. M. gracilis, sp. n. 
Literal translation, principal joint.’' 
