of the '■British Sesftile-cyed Crnsfdcea.^ 135 



in the ' Brit. Sess.-eyed Crust.' The miinbcrs arc those on 

 the tubes. 



Lysianassa Costce, M.-Ed\vards (12). 



The tube contains four specimens in good condition. Of 

 tliese one only — the larj^est — i.s L. Costm ? ; of the others 

 two are L. lonfjicornis^ Lucas, and the remaining one not a 

 Lysiatuxssa — perhaps Orchomene pinrjuis^ Boeck. Owing to 

 the kin(hiess of Dr. Norman in lending me mounted speci- 

 mens of L. longicornis from the Adriatic, I arrived at the 

 conclusion tliat 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 suo-g-ested at the time. 



fill 1 . . . . . ^^ 



1 he characteristic spiuc [)rojecting from tlie lower margin of 

 the hist joint of the peduncle of the upper antennas is absent 

 in both the specimens I had tlien 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. 



Lysianassa Audouiniana, Bate (H). 



A single specimen in bad condition. It is impossible to 

 make out any details without dissection, 



Lysianassa atlajitica^ M.-Ed wards (13). 



The tube contains two specimens, of which one appears to 

 be CaUisoma Kroyeri^ 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 telsou is not " simple " as 

 described, but cleft to the base, without lateral spines, but 

 with a terminal spine in a deep notch in each 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.-Edwai'ds's description, which says 

 " Abdomen termine par une lame bilobee." 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 iu Ichnopus sjyini- 

 cornis, Boeck. No spine was observed on the peduncle of the 

 upper antennas, but there are two on the lower side of the 

 first joint of the flagellum. 



* ' Proceedings of the Liverpool Biolog-ical Society,' vol. iii. Session 

 1838-89, p. 200, pi. .x. tigs. 1-8. 



