no AMrniroDA nobmalia. 



Porciopoda strong, subcheliform, subcqual ; coxa? moderate ; fourth 

 pair produced inferiorly into a point. Three anterior pairs of 

 pleopoda elongate ; three posterior pairs feeble." — Krdyer. " Tel- 

 son single, squamifomi, entire." — Liljeborg. 



1. Lafystius Sturionis. 



Lafystius Sturionis, Kroyer, Nat. Tidskr. 1 ser. vol. iv. p. 156. 

 Liljehorg, Offers, af Koiigl. Vetensk. Akad. Forhnndl. 1855. 



''Body depressed. Dactylos on each of the pereiopoda powerful, 

 long, strong, arcuate, sharp, very similar to those in Felina among 

 mammals, and resembling strongly those of the parasitic Isopods, 

 especially in the erratic C}Tnothoedians. Superior antenufe un- 

 usually thick, scarcely reaching to the fourth segment of the 

 pereion ; peduncle and flagellum about equal in length, the latter 

 consisting of about nine rapidly decreasing joints. Inferior 

 antennse placed beneath and behind the superior, much smaller, 

 but not much shorter ; last joint of the peduncle longer than the 

 rest ; flagellum consisting of about seven joints. Mandibular 

 appendage large, triarticulate, last joint aculeate. Propodos of 

 the second pair of gnathopoda nearly oblong-ovate ; dactj'los 

 scarcely unguiform, minute, lamellose, arcuate, apex setiferous. 

 Pleon suddenly narrower posteriorly. Three posterior pairs of 

 pleopoda large, and formed for leaping (?) ; last pair ha\ing 

 lamellose rami, concave above, subulate, exterior the smaller, 

 both longer than the peduncle. Telson not divided, lamellose, 

 small, roimd-ovate. 



" Length of the largest specimen about 7 millimetres by 2| broad. 



'' Coloiu- white. Eyes round, black. 



" The males are much smaller than the females, and have the 

 propodos of the second pair of gnathopoda thicker and shorter ; in 

 other respects they resemble each other." — Liljeborg. 



Hab. In crowds behind the first pectoral fin of Acipensei' Sturio, 

 and more rarely from Siptalus galeus. — Kroger. In a similar position 

 on Gadus morrhua, neai" Kullaberg. — Liljeborg, 



2Q. GUERINIA. 



Guerinia, Hope, Fauna of Naples (three new Crustacea'). 



Cephalon but slightly produced, anteriorly depressed. Eyes con- 

 vergent, coalescent (?). Superior antennoe appendiculate. Coxte 

 not so deep as their respective segments. First pair of gnathopoda 

 subchelate. Second not subchelate ; dactylos spatuHform. Pos- 

 terior pairs of pleopoda biramous, Telson single, squamiform. 



