ZOOLOaY AND BOTANY, MICROSCOPY, ETC. 



377 



were extraordinarily few in number, the largest number of species 

 were obtained from the North, Atlantic, South Atlantic, Eastern 

 Asiatic, and Australasian seas. 



The Arctic and Antarctic oceans seem more favourable to the 

 growth of the Copepoda than other regions, the number and size of 

 the individuals being larger here than elsewhere. The Tropical and 

 Sub-tropical seem, however, to maintain the largest number of species 

 and genera, though no one form is so abundant as is Calanus fin- 

 marchicus of the Polar seas. 



The report contains a description of all the new species as well 

 as of several others already known to science, and is illustrated by a 

 number of woodcuts and 55 plates. 



longipedina Paguri.* — W. Miiller describes a new Copepod of 

 the family of the Harpactidse, for which he forms a new genus as 

 above. It was found living parasitically on species of Pagurus. 



Cytheridse.t — W. Miiller has some observations on the genera- 

 tive organs of these Crustacea. The penis is composed of a number of 

 movably-connected chitinous ridges with bundles of muscular tissue ; 

 the differences presented by different forms are, probably, of greater 

 interest to the systematist than the morphologist. The following 

 table shows the relations of the parts in Cypris and Cyihere : — 



Cypris. 



Cyihere. 



Female. 

 Vagina. 



Male. 



Penis, hinder 

 part? 



Female. 



Vagina, or rudimentary 

 vagina (lobi abdominales). 



Male. 



Hinder part 

 of penis. 



Penis. 



External appendage of the 

 rudimentary organ. 



Penis, with- 

 out hinder 

 appendage. 



Mucous gland. 



Eudimentary organ. 



A list is given of the species found in the North and Baltic Seas, 

 and a new genus Gyiherois is formed for G. mrens n. sp. It approaches 

 but is not so much modified as Paradoxostoma in the character of 

 its mouth-organs ; it is, however, clearly adapted for taking in fluid 

 nutriment, the mandibles being unarmed, and there being no organs 

 which serve to comminute the food. 



Deep-Sea Crustacea.^ — Among the remarkable forms of deep- 

 sea Crustacea collected by the 'Talisman' is one to which A. Milne- 

 Edwards has given the name of Nematocarcinus gracilipes ; it is dis- 

 tinguished by the extraordinary length of its antenna, and by the 

 attenuation of its ambulatory appendages. 



* Arcli. f. Naturg., 1. (1884) pp. 19-23 (1 pL). 



t Ibid., pp. 1-18 ( 2 pis.). 



X Nature, xxix. (1884) pp. 531-3. 



