244 THE VOYAGE OF H.M.S. CHALLENGEE. 



Lepidadylis, and S. I. Smith lias identified it with Lepidactylis dytiseus, Say, which is the 

 same as Oniscus arenarius of Slabber, for which P. L. S. Miiller proposed the generic name 

 Haustorius. The genus BeUia is thus defined : — "Back broad, round and smooth. Q^^er 

 antennse, forked. Lower antenna3 ciliated, having the second joint flattened. First pair 

 of feet simple : second and third pairs didactyle, remainder simple. The three anterior 

 jJairs of feet much smaller than the rest ; the lateral appendage to each annular segment, 

 together with the joints of the three last pairs of feet, largely developed, so as to appear 

 like scales. Natatonj feet arranged in double parallel pairs." I may mention that this 

 creature is very common in stretches of sand round the British coasts, and very vivacious 

 in appearance when burrowing into the sand. While it is alive in sea-water, the circula- 

 tion can, under the microscope, be very distinctly seen in the broad plates of the hinder 

 peraaopods. 

 " Amphithoe Moggridgei" here described and figured as new, was in the Brit. Mus. Catal., 1862, 

 referred to Amathia (Cancer) carino-spinosa, Turton, but in the same year, 1862, in the 

 " British sessile-eyed Crustacea," it was identified with AmathiUa sabini, Leach, the 

 Amathilla homari. Fab., of this Report. 



1851. Brandt, J. F. 



Beitrage zur Kenntniss der Amphipoclen {Crustacea Amphipoda) von J. F. 

 Brandt. (Lu le 15 novembre 1850.) pages 133-144, and (Lu le 20 decembre 

 1850). pages 310-313. Bulletin de la classe pbysico-matliematique de I'Academie 

 imperiale des sciences de Saint-Petersbourg. Tome neuvieme. St-Petersbourg, 

 1851. PI. IX. 



After reviewing earlier opinions on the distinctions between Talitrus and Orchestia, and the 

 agreement of the two in regard to the second gnathopods of the females, he points out that 

 in many other classes generic distinctions have been drawn from the peculiarities of a single 

 sex, but that, apart from this, there is a real though somewhat fine distinction between 

 Talitrus and Orchestia in regard to the first gnathopods. He therefore defines these as 

 follows, recognising that "Der zweifeUiafte, vielleicht keinen echten Talitrus darstellende 

 T. Cloquetii ist dabei ausgesohlossen " :■ — "Genus Talitrus Bosc. e. p. Talitrus Leach, Latr. 

 M. Edw. Dana. Pedum primi paris ultimus articulus in mare et femina subconious, liaud 

 cheliformis vel subcheliformis, ungue elongato, parum flexili ipsius articuli marginem 

 inferiorem longe superante armatus. — Pedum secundi paris ultimus articulus in utroque sexu 

 imgue obsoleto, margine ipsius inferiore breviore instructus. — Antenna superiores basi seu 

 pedunculo inferiorum breviores. Maxilhpedes apice obtusi. 



" Genus Orchestia Leach. Latr. M. Edw. Pedum primi paris ultimus articulus in maribus et 

 feminis plus minusve apice dUatatus, ungue flexili, incurvo breviusculo armatus, quare 

 subcheUformis. — Pedum secundi paris ultimus articulus marium semper maximus, cheliformis, 

 in feminis mediocris vel parvus complanatus ungue obsoleto ipsius margine inferiore breviore 

 instructus. Maxillipedes apice obtusL" 



Talitrus cloquetii, if rightly represented in the Description de VEgypte should, he thinks, form an 

 intermediate genus (eine eigene Mittelgattung) between Talitrus and Orchestia, for which 

 he proposes the name, Talitrorcliestia? He would then follow Gui'rin in making three 

 sections of the genus Talitrus, thus arranged : — 



" Sectio A. Pedum par anterius secundo longius," with " Spec. 1. Talitrus saltator Montagu ; " 

 "Spec. 2. Talitrus Beauooudraii M. Edw;" "Spec. 3. Talitrus brevicornis M. Edw.;" 

 " Spec. 4. Tahtrus tripudians Kroyer." 



