of the ‘British Sessile-eyed Crustacea.’ 135 
in the ‘ Brit. Sess.-eyed Crust.’ The numbers are those on 
the tubes. 
Lystanassa Coste, M.-Fidwards (12). 
The tube contains four specimens in good condition. Of 
these one only—the largest—is L. Coste ?; of the others 
two are L. longicornis, Lucas, and the remaining one not a 
Lysianassa-—perhaps Orchomene pinguis, Boeck. Ovving to 
the kindness of Dr. Norman in lending me mounted speci- 
mens of L. longicornis from the Adriatic, I arrived at the 
conclusion that not only were the two specimens mentioned 
above that species, but also that the species described by me* 
as L. ceratinus is a female of it, as suggested at the time. 
The characteristic spine projecting from the lower margin of 
the last joint of the peduncle of the upper antenna is absent ° 
in both the specimens I had then obtained; but I have since 
dredged a specimen in the Menai Straits which has it 
partially developed. It is probably not fully developed till: 
the animal is full-grown, 
Lystanassa Audouiniana, Bate (11). 
A single specimen in bad condition. It is impossible to 
make out any details without dissection. 
Lysianassa atlantica, M.-Edwards (13). 
The tube contains two specimens, of which one appears to 
be Callisoma Kréyert, Bruzelius, and the other to be that 
figured in the ‘ Brit. Sess.-eyed Crust.’ It appears to have 
been partially dissected, as one of the first and both the second 
gnathopods are missing. The telson is not “simple” as 
described, but cleft to the base, without lateral spines, but 
with a terminal spine in a deep notch ineach division. ‘This 
character, while it would remove the species from the genus 
Lysianassa to (probably) Socarnes, Boeck, at the same time 
agrees sufficiently with M. -Edwards’s s description, which says 
“Abdomen terminé par une lame bilobée.”” The first gnatho- 
pod is much too long and slender for Socarnes Vahlii, Kroyer. 
The third pleon-segment has the hinder angle acute and 
shortly recurved, but without a sinus, as in Jchnopus spini- 
_cornis, Boeck. _No spine was observed on the peduncle of the 
upper ‘antenne, but there are two on the lower side of the 
first joint of the flagellum. 
* «Proceedings of the Liverpool Biological Society,’ vol. iii. Session 
1888-89, p. 200, pl. x. figs. 1-8. 
