OAMMAniD^. 71 



jointed. Inferior antennnc about two-thirds as long as body, often 

 bont baekwartls and concealed beneath the coxoc ; the peduncle 

 short, having the penultimate joint very stout. Two anterior 

 pairs of gnathopoda similar, slender. First pair of pcrciopoda 

 longer than second ; third to fifth gradually increasing in length ; 

 posterior margin of first joint sernilate. 



" Length about one-fourth of an inch. 



" Colour a tinge of green. 



" Hab. Rio Janeiro, about the sand-beach near the Sugar-loaf." — 

 Dana. 



The author observes that, " not having specimens, it is possible 

 that the gnathopoda may be imperfectly subchelate, on which ac- 

 count it may be nearer Atwnyx' than Lysianassa." 



13. Lysianassa spinicomis. 



Lysiana^sa spinicomis, Costa, Rend, delki Reale Accad. delle Sc. di 

 KupoU, p. 172, 1853. 



" Ha\-ing the first joint of the peduncle of the superior antennte pro- 

 duced anteriorly and inferiorly into a spine ; third joint scarcely 

 shorter than the second ; flagcUum as long as the peduncle. In- 

 ferior antennae a Httle shorter than the superior, flagellum scarcely 

 longer than the peduncle. Eyes very large. Second pair of gna- 

 thopoda having a dactylos. Three posterior pairs of pereiopoda 

 subequal in length. 



" Length 3^ lines. 



*' Hah. Coast of Naples." — Costa. 



14. Lysianassa loricata. 



Lysianassa loricata, Costa, Rend, delta Reale Accad. delle Sc. di Napoli, 

 p. 172, 1853. 



" Antcnnoc subequal ; joints of the superior considerably decreasing ; 

 flagellum as long as the peduncle ; flagellum of the inferior half as 

 long again as the peduncle. Second pair- of gnathopoda having a 

 minute dactylos. Fourth pair of pleopoda distinctly surpassing 

 the fifth, and the fifth the sixth. 



" Length four lines. 



" Ilab. Coast of Naples."— Costo. 



15. Lysianassa huinilis. 



Lysianassa huniilis, Costa, Rend, dclla Reale Accad. delle Sc. di Napoli, 

 p. 172, 1853. 



" Antcnmc short, subequal. Third joint of the peduncle of the su- 



