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



got only a Scalpellnw, an Ardurug, and a spiny Amphipod, which is the corresponding 

 form to the Gammanis lorieatus of the Xorth. Near Heard Island, in 75 fathoms, we 

 found the same animal and a Sph^roma, but no other Crustacea at all." The spiny 

 Amphipod is named in this Eeport Acanthechinus iricarinatus. I have seen no second 

 specimen of this striking species, but as Iplnmedia pulchridentata was dredged in 75 

 fathoms near Heard Island, it is probable that on a cursory inspection this species was 

 mistaken for the other. 



1877. Bate, C. Spencb. 



Eeport on the present state of our knowledge of the Crustacea. Part I. On 

 the homologies of the dermal skeleton {continued). [Fiwn the Eeport of the 

 British Association /or the Advancement o/" Science /o?^ 1876.] London. 1877. 

 Plates II. & III. pp. 75-94. 



At page 81 Mr. Spence Bate says, "the fact that the supposed side-plates, or epimera, were 

 merely the first joint of the normal legs or appendages has been satisfactorily demonstrated 

 in the Edriophthalmia, as far as relates to the somites of the pereion ; but hitherto the 

 relation of the side-plates of the pleon to the normal condition of the mobile appendages 

 had not been demonstrated until the structure of the dermal anatomy of the genus Apseudea 

 had been made out. [Hist. Brit. Sessile-eyed Crust, vol. ii. p. 146 {Apseiides)]; that 'one 

 interesting and, as far as we know, unique feature in these Crustacea yet remains to be 

 noticed. The segments of the pleon have the lateral walls (long known as the epimera of 

 Milne-Edwards, called also the pleura by many authors) existing as articulated appendages, 

 demonstrating two important features in the homologies of these parts : 1st, that they are 

 all really portions of the appendages, being the first joint or coxse of the pleopod . . . and 

 2nd, that, since the peduncle consists of three joints, the second branch in the appendages 

 of the pleon, as in other parts, is shown to take place invariably at the extremity of the 

 third joint.' " It seems to me, however, that the force of this argument is weakened or 

 destroyed, by the fact that numerous species of Apseiides have now been examined and 

 described by various authors, and in regard to no one of the species has any author followed 

 Jlr. Spence Bate in speaking of the epimera of the pleon as articulated. 



As a curious fact in comparative carcinology, Mr. Spence Bate observes, that " contrary to a 

 possible condition of all other appendages, the coxal joint of the first pair of antemiEe is never 

 absorbed into or fused with the sternal portion or ventral arc of the somite to which it 

 belongs " (p. 85). Numerous allusions to the Amphipoda occur, as might be expected, in 

 difierent parts of this memoir. 



1877. Chatin, Joannes. 



Eecherches pour servir a I'histoire du batonnet optique chez les crustaces et les 

 vers. Annales des Sciences Naturelles. Sixieme serie. Zoologie, Tome V. 

 Paris, 1877. 



A list is given of earlier works bearing on the subject. In regard to the cone, " cette pi^ce 

 generalement brillante et refringente qui surmonte le batonnet optique dans les Arthropodes," 

 he says, " La forme du cuno est, de tons ses caracteres, celui qui prdsente les variations les 

 plus nombreuses et les plus considerables. II est en g(5ni5ral prismatique chez les Tijpton, 

 Epimeria, Lkliomolgus; ovoide dans les EupaguruD, Pagurides, Caprella, Notopiteroplwms; 



