540 THE VOYAGE OF H.M.S. CHALLENGER. 



meijaliips, distinguished by the uncommonly thick arched rostrum and large, confluent eyes ; 

 132. Halicreion (?) latipes, only provisionally referred to Boeck's genus, as Sars recognises 

 that the third uropods are not longer than the second, which is the case in the typical 

 species, Halicreion longicaudatus, and that the proportions of the first four pairs of 

 peraeopods in the two species are very diflerent; 133. Paramphitlwi} hrcricuniis, with 

 a general resemblance to species of Mcfopa, to be distinguished from its own allies by its 

 small size, pale colour, and unusually short antenn.e ; 134. Paramphithoe assimilis, nearest 

 to Paraviphitlwe glabra, Boeck, but distinguished by the eyes, " magni, rotundato- 

 triangulares," the " epimera anteriora mediocria, dente anguU infero-posterioris fere 

 obsolete," the two gnathopods " manu elongato-ovata in 2**° pari paulo majore, acie bene 

 deliuita, obliqva, margine inferiore spinis nonnullis et fasciculis pilorum oruato," and the 

 considerably greater length of the jaeraeopods ; 136. IphimecUa minuta, distinguished from 

 IpMmedia ohesa, Rathke, by Professor Sars by its having no spine on the first joint of the 

 upper antennae and by the different form of the two pointed processes at the lower 

 hinder angle of the third pleon-segment, as well as by its small .size and very different 

 colouring ; distinctions of somewhat doubtful specific value, that of colour above all being 

 untenable in face of the numerous variations which Iphivwdia ohesa undoubtedly pre- 

 sents; 137. Atijlns uiirinatus, very like Atijlus su-ammerdami, M.-Edw., but distinguished 

 by the very remarkable first perasopods " structura singulari, organa valida afhxionis 

 formantes, articulo 4to brevissimo, cupuliformi, 5to magno et curvato ad basin fasciculis 

 2 spinaruni armato, ungve terminali fortissimo, falciformi," a species which appears to 

 be synonymous with Atylus faJcaius, Metzger, 1871; 138. HaUrages megalops, dis- 

 tinguished from its ally Halirages tridentatus, Bruzelius, by the enormously developed 

 eyes and the " segmcnta 2 priora corporis postici supine medio in processus singulos 

 acutos producta; segmeutum 3tium ad angulum infero-posteriorem truncatum et fortiter 

 serratum; 139. Halirages incrmis, to be recognised by its slender body, want of dorsal 

 processes, thin, elongate peraeopods, and the sides of the head produced downwards 

 into conical processes; 141. Ampliifhopsis nodifera, distinguished by a pair of tubercles 

 on the back of the first, and another pair on the back of the second, pleon-segment ; 

 143. Tritropis inflata ; 144. Tritropis avirostris, which, with the preceding species, 

 must be transferred to Rhacliotropis, S. I. Smith; 147. Melita piellucida, "corpus 

 pellucidissimum absqve pigmento. Longit. 5°™." ; 149. AmpieKsca gihha, in the form 

 of the last peraaopod said to be very like Ampelisca Ixvigata, Lilljeborg, but clearly dis- 

 tinguished by the different form of the head, although nothing in the figures and descrip- 

 tions given respectively by Sars and Boeck of Amptelisca gihba and Ampielisca Ixngata 

 seems to justify the separation of the former from the latter; 151. Ampjelisca anomala, a 

 species of importance as a link between the two genera Ampielisca and Byhlis, even without 

 links sufficiently close. In the general form of the body and development of the side- 

 plates, the new species, according to Sars, is a genuine Ampielisca, whereas the two basal- 

 joints of the lower antennae are quite uncovered as in the genus Byhlis. The last uropods 

 extend indeed beyond the others, but still are far from being as strongly developed as is 

 usual in species of Ampjelisca ; 153. Byhlis erijthrops, distinguished from Byhlis gaimardii 

 by smaller size, red eye-pigment, longer upper antennae, and by the penultimate joint of the 

 peduncle of the lower antennae being distinctly shorter than the last joint; 154. Photis 

 tenuirornis, the antennte shorter and thinner than usual, sparsely pilose with short bristles, 

 the palm of the first gnathopod obliquely excavate, of the second "bisinuate"; 156. 

 Gammaropsis melanops, " = G. erythrophthalma Jioeck., non Lilljeborg," distinguished by 

 Sars from Lilljeborg's species by the shorter secondary flagellum of the upper antenna', the 

 acute antero-lateral angles of the head, and the also acute infero-posterior angle of the third 

 pleon-segment, while, further, the eyes in this species are black, not red, as required by the 



