EEPOET ON THE AMPHIPODA. 337 



Posterior pair of pereiopoda longer tliau the others. Posterior pair of pleopoda short, 

 almost rudimentary, double-branched. Telson single, squamiform." 

 " This genus differs from Unciola of Say in the absence of a secondary appendage to the superior 

 antennae, in the form of the second pair of gnathopoda, in the shortness of the posterior pair 

 of pleopoda, and in the character of the telson." The type species is Unciola irrorata, 

 Gosse (not Say). Drijope crenatipalma, n. s., re-named crenatipalnuda in the Brit. Sess. 

 Crust., seems to me to be only a variety of Dryope irrorata. The secondary appendage, 

 though very small, is not wholly wanting to the upper antennae. 

 OoropMum sjnnieonw, n. s., is considered by Boeck a synonym of Corophium crassicorne, 



Bruzelius, 1859. The name too was preoccupied by Stimpson in 1856. 

 Division Hypeeina. Fam. 1. Htperid^. " Lcstrigoiius Kinahani,i\. s.," is held by Boeck to 

 be a synonym of Hijperia medusarum, Midler, which Meinert rejects, considering Midler's 

 description too indefinite, and therefore adopting the name Hyperia galha, Montagu. 

 Streets would keep Lestrigonus distinct from Hypcria. " Vihilia Edicardsii" though here 

 given as new, had been already published in the Annals and Magazine of Nat. Hist., 1861. 

 Vihilia affinis (Vibilia affinis, MS. Cat. Musee Jardin des Plantes) is from Java. " Cyllopus 

 Liicasii, n. s.," is from " the Powel [Powell] Islands," now known as the S. Orkneys ; 

 " Cyllopjus Danse, n. s.," from " near the Powel Islands," is probably a younger form 

 of Cyllopus lucasii. '' Themisto Guerinii, n. s.," " Hab. (In the Atlantic?) Latitude 

 of La Plata {3fS. lahel)," is said to resemble closely the much larger Tliemisto antardica, 

 Dana. 

 Fam. 2. Phronimidje. Subfam. 1. Phronimides. " riironima Borncpnsis, n. s." (Phronima 

 Atlantica, White, Cat. Crust. B. M. 1850) is no doubt, as Spence Bate himself suggests, to 

 be identified with Phronima sederdaria, Forskal. Subfam. 2. Phrosinides. Phrosina 

 longispina, n. s., is doubtfully distinct from Phrosina semilunata, Risso, with which Sp. 

 Bate is inclined to unite Phrosina niceten.ns, M. -Edwards. Anchylomera antipodes, n. s., 

 was taken " near the Antipodes," 

 Fam. 3. Platyscelid.e. Platyscelus, here given as a new genus, though already described in 

 the Ann. and Mag. of Nat. Hist., July 1861, is a synonyui of Ditlujrus, Dana. Of 

 the species " Platyscelus Rissoins, n. s.," and Platyscelus serratus, n. s., the latter is 

 united by Claus to Typhis ovoides, Eisso, and he inclines to treat the former in the same 

 manner. 

 Brachysceliis is here given as a new genus, but the description of it and of the type species, 



Brachyscelus crusculwni, appeared in the Ann. and Mag. of Nat. Hist, for July 1861. 

 Tliamyris, new genus, is thus defined : — " Superior antennjB short, three-jointed. Inferior 

 antennae obsolete. Posterior pair of pereiopoda represented by a basos in the form of a 

 membranous scale only." 

 " In all other respects this genus so nearly corresponds with Brachyscelus, that future research 

 will probably demonstrate their closer connection." The type species is Thamyris antipodes, 

 n. s. Claus decides that Tliamyris is the male of Brachyscelus. His own genus Schiwha- 

 genia he recognises as an additional synonym, and names the genus Tliamyris, but 

 Brachyscelus has the priority. Brachyscelus in turn must yield to Dairilia, Dana, if the 

 suggestion of Bovallius be accepted, that Dairilia is identical with Thamyris. 

 Ampildpronoe, new genus, is thus defined :—" Cephalon round, anteriorly oblique. Pereion not 

 broader than the cephalon. Pleon having the fourth and fifth segments fused into one. 

 Superior antennne having the peduncle three-jointed; third joint large, inferiorly convex 

 and anteriorly produced, having the superior margin subapically excavated to receive the 

 short flageUum. Inferior antennas five-jointed. First pair of gnathopoda complexly 

 subchelate ; second pair not subchelate. Third and fourth pairs of pereiopoda largely 

 dilated, having the remaining joints as long as the basa ; fifth pair rudimentary. Posterior 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxS 43 



