1895. RESULTS OF '^CHALLENGER" EXPEDITION. 57 



S. gracilis, the epimera are pulled out into long spines ; but this is not 

 the case in the fourth deep-sea Seyolis, S. antarctica. It is, however, in 

 the genus Arduvus that this peculiarity is most apparent. A. glacialis 

 is almost dangerous to handle from the multitude and sharpness of the 

 spines which deck its body ; and other species possess almost equally 

 effective chevaiix-de-frise. 



F. E. Beddard, 



The definition of the generic and specific characters in the group 

 of small Crustacea known as Ostracoda, is very important to 

 naturalists, and the " Challenger" Repoii hy so experienced a biologist 

 as Dr. G. S. Brady is, therefore, a most valuable production. The 

 material discussed in this Report is arranged as follows : — The 

 Podocopa are represented by the Cypridse, of which forty-six species 

 placed in eight genera, two of them new, are described ; the 

 Darwinulidae ; and the Cytheridas, which include one hundred and 

 forty-nine species placed in thirteen genera : the Myodocopa are 

 represented by the Cypridinidae, including seven species in four genera, 

 of which one is new ; and a single genus of the Conchoeciadas, com- 

 prising three species : the Cladocopa furnish only a single genus of 

 Polycopidae, represented by three species : the Platycopa number 

 thirteen species of Cytherellidae, all placed in one genus. Altogether 

 two hundred and twenty-one species, of which one hundred and forty- 

 four are new, are discussed. 



Excepting, of course, the Myodocopa, Ostracoda were found to 

 be living in very limited numbers, both as to species and individuals, 

 at the greatest depths. Below 1,500 fathoms only seventeen species 

 were recognised in thirteen dredgings ; and below 50 fathoms, 

 fifty-two species in twenty-three dredgings. Shallow waters, however, 

 proved exceedingly prolific. The geographical, as well as bathy- 

 metrical distribution, and the biological history are fully dealt with in 

 this valuable monograph, which has made one more leaf in the vast 

 book of Nature fairly legible and useful for the advancement of 

 knowledge. 



T. Rupert Jones. 



The Cirripedia of the " Challenger " Expedition formed an 

 extremely interesting collection of about eighty species, of which 

 three-fourths proved new to science. Before then, the existence of 

 Cirripedia in the great depths of the ocean was almost unknown, the 

 species of Scalpellam dredged by the " Voringen," and described by 

 Professor G. O. Sars, being the only recorded instances. Sars met 

 with six species of Scalpcllum in the North Atlantic ; more than forty 

 species of this genus were collected during the cruise of H.M.S. 

 " Challenger" ; with one exception they were all new, and contained 

 the largest forms of pedunculated Cirripedia observed up to that 

 time. Equally interesting forms of Cirripedia inhabiting the deep 

 sea are the representatives of the genus Verruca — sessile Cirripedia 



