REPORT ON THE AMPHIPODA. 437 



Orchesfia agilis, n. s., pi. iv. fig. 14; Orchesfia palustris, n. s.; Talorchestia longicornis, 

 Smith (TaJitnis lontjieoniis, Say, Orchedia lonr/icoimis, M.-Ed\v., and De Kay); Talorchestia 

 ' megalopJilhalma, Smith {Orchcstia riiegalophthalina, Bate, Talitrus quadrijidus, De Kay, 



" may bo based on the female of one of the preceding species, but it is so badly 

 described and figured as to be indeterminable ") ; Hyale littoralis, Smith {Allorchesfes 

 KttoraUs, Stimpson); Lyifianassa, species; Lepidadylis dytiscus, Say; Phoxvs kroyeri, 

 Stimpson: Urothoe, species; Monoculodes, species; Laphystius durionis, Kroyer {Dar- 

 winia compressa, Bate); Calliopius Iseviusculus, Boeck (Kroyer); Pontogeneia inermis, 

 Boeck [Aiiipliithoe iiiermis and rrmulafa, Kroyer, Iplrhnedia vulgaris, Stimpson; Afylus 

 inermis, crenulatus, and vulgaris, Bate ; Aiylus vulgaris, Packard, not Atylus (Paramphitue) 

 inermis, Packard, Mem. Boston. Soc. Nat. Hist., vol. i. p. 298, 1867); Gammarus ornatus, 

 M.-Edw., pi. iv. fig. 15 {Gammarus lucusta, Gould; Gammarus piulex, Stimpson); Gam- 

 marus annulahis, TL. s.; Gammarus natator, n. s.; Gammarus marinus. Leach; Gammarus 

 mucronatus. Say (Gammaracanthus mucronalus, Bate, on which Smith remarks, "our 

 specie.^ cannot be referred to Bate's genus Gamniaracantlms, for the dorsal margin is not 

 distinctly carinated, and the third, fourth, and fifth segments of the abdomen are furnished 

 with fascicles of spmes."); Mara levis, n. s.; Melila nitida, n. s.; Ampelisca, sp,, pi. iv. 

 fig. 17, undescribed; Byhlis serrata, n. s.; Ptilocheirus pinguis, Stimpson, which falls to 

 Zaddach's genus Lcpilocheirus ; Microdeutopus minax, n. s.; Autonoe, sp.; Amphithoe 

 maculata, Stimpson, pi. iv. fig. 16; Amphitlwe valida, n. s.; Amphithoe longimana, n. s.; 

 Amphithoe compta, n. s.; Podocerus fucicola, Smith (Cerapiis fucieola, Stimpson); Podo- 

 cerus, sp.; Cerapus rulrrieornis, Stimpson, pi. iv. fig. 18, which Smith later identifies 

 with Erichthonius difformis, M.-Edw.; Cerapus minax, n. s., presumablj' Erichthonius 

 minax, since in 1880, Smith attributes to the genus Cerapus, tuhularis. Say, as the only 

 species); ? Gerap)us tuhidaris, Say, subsequently identified without doubt; Corophium 

 cylindricum. Smith (Podocerus cylindrieus. Say, not of Bate); Siphonoecetes euspidatus, 

 n. s.; Unciola irvorata, Say, pi. iv. fig. 19; Hyperia, species, "upon the large red 

 jelly-fish (Cyanea) " ; " another species of Hyperia was taken at the surface in company 

 with Salpa:" Phronima, species, "closely allied to the P. atlantica of Guerin. According 

 to Professor Verrill's notes it is, in life, translucent, scarcely tinged with yellowish-white, 

 and nearly invisible in the water ; the eyes red. Another form allied to the last was 

 taken with it, and is possibly the male of the same species, but differs from it, and from 

 the characters usually assigned to the genus, in possessing well-developed autennulse. In 

 life, according to Professor Verrill, it was translucent whitish, the body spotted with dark 

 brown, and the eyes blackish."; Thyropus, species; CapreUa geometrica. Say, pi. v. 

 fig. 20, which Mayer identifies with CapreUa acutifrons, Latreille ; Capirella, species. 

 In the addenda, p. 451 (745), is given, Themisto, species undetermiued. " It occurred swim- 

 ming at the surface in vast numbers, and was thrown up by the waves in windrows, 

 extending several miles along the shores of Martha's Vineyard." 



1874. WiLLEMOES SuHM, EuDOLPH VOK 



On a new Genus of Ampliipod Crustaceans. Eeceived February 27, — Eead 

 March 6, 1873. Philosophical Transactions of the Eoyal Society of London. For 

 the year mdccclxxiii. Vol. 163. London, mdccclxxiv. pp. 629-63G. Pis. 

 XLIX., L. 



Thaumiips pellucida, already mentioned in the Proc. E. S., 1873, but here figured and more 

 fully described, was atterwards recognised as Cystisoma nepfu7ius or neptuni, Guerin, 1842, 



