REPORT ON THE AMPHIPODA. 521 



species, tlie females, and especially the younger specimens, agreeing with Podocerus j)elafjicus, 

 Sp. Bate, the adult females having often the varlegatus form ; the males being either of 

 the pulchellus or falcatiis form. Boeck and Hoek, he thinks, were wrong in regarding 

 these two latter as stages of growth, for they attain an equal size, and series of the two 

 forms do not seem adapted for passing one into the other. Podocerus ocius, Sp. Bate, he 

 regards as quite distinct. 



To Ccrapus abditus, Templeton, he assigns Dercothoe pmiciata, M.-Edw., as the female, but 

 without giving reasons. 



In Cyrtophium he points out that the 1-2-articulate accessory flagellum has been overlooked. 

 He considers that the genus should bo transferred from the Corophiidffi to the Dulichiidre. 

 The species CyrtopMum darwinii, Spence Bate, to which Nebeski is referring, ought no 

 doubt to be placed in Dana's genus Platoplmim, which Dana himself distinguished from 

 CyvtopMum by the presence of an accessory flagellum. 



Pages 47-48 contain the list of " Literatur." Fig. 41 refers to Microdeutopus gryllotalpa, 

 Costa ; Fig. 42 gives the telson of Podocenis falcatus, Amphithoe longicornis, Ampthitlioe 

 largimana, Amphitlioii penicillata, Microdeutopus, Ampltitlioe hicuspis, Microprotopms. Fig. 

 42 refers to Podocerus falcatus ; Fig. 43 to Podocerus ocius. The earlier figures illustrate 

 the anatomical details given in this important paper. 



1880. Nicholson, Henry Alleyne. 



A Manual of Zoology for the use of students with a general introduction on 

 the principles of zoology. Sixth Edition, revised and enlarged. Edinburgh and 

 London, mdccclxxx. 



In the Arthropoda, Class I. Crustacea, has in this work, p. 302, Subclass IV. [III., see p. 283], 

 Malacostraca {Tlioracipoda, "Woodward), in which Division A. Edriophthalmata, is spUt up 

 into three orders, Ltemodipoda, Amphipoda, Isopoda. In the definition of the Lsemodipoda, 

 they have " The first two seginents of the tliwax amalgamated with the head and. carrying 

 legs," which is no doubt a theoretically accurate description, if the maxillipeds are regarded 

 as legs, but in the account which follows the statement is retained from earlier editions that 

 " the first thoracic segment is amalgamated with the head, and the limbs of this segment 

 appear to be inserted beneath the head, or, as it were, beneath the throat ; hence the name 

 given to the order." Here the first thoracic segment is the second thoracic segment of the 

 definition. The mandibles are stated to be without palps, which is not the case in all, or 

 even most, genera of this order. A figure is given of " Caprella phasma," which belongs 

 to a genus possessing mandibular-palps. The species is known as Protella phasma, 

 Montagu, and has rudimentary peraeopods, which are not indicated in the figure. 



The second order, Amphipoda, is exemplified by Talitrus locusta, which is figured, and 

 Gammarus pidex. It is remarked that " all the Amphipoda are small," a rather indefinite 

 statement, scarcely indicating the actual range from about a tenth of an inch to something 

 over four inches. 



The statement that " the earliest known Isopod is the Prosoponiscus of the Permian rocks " 

 is a mistake obviously due to the misleading name Prosoponiscus, which is as uusuitcd as 

 its predecessor Pdlxocrangon for a genus of fossil Amphipods. 



(ZOOL. CHALL. EXP. PART LSVII. — 1887.) XxX 66 



