llev, T. li. K. Stebbing on Crustacea. 21 



Tlie synoptical table of tlie species of Dichelaspis given by 

 Dr. lloek in liis Kejiort of the Cinipedia of the ' Cliallenger' 

 may now be enlarged as follows : — 



I. Carinn terminatiii",' in n disk. 



1. Basal sffnniMit of the scutum twice as 



wide a^j the <iechulont segment. Iliibi- 



t«t : eastern wnters, on a crab I). Wancickti (Gray). 



2. Rasal segment of scutum three times as 



wide as the occludent se>rmeiit ; terfrimi 

 widening downwards. Habitat: West 

 Indies, on a Palinurid D. Honki, .sp. n. 



3. Basal segment of scutum three times as 



wide as the occludr-nt ; terguin narrow- 

 ing downwards. Habitat: West Indies, 

 on a Palinurid D. antiyucs, sp. n. 



4. Basal segment narrower than the occlu- 



dent segment. Habitat : probably 

 oriental, attached to the skin of a sea- 

 snake D. Gra;ii>\ Darwin. 



5. Basal segment much narrower than the 



occludent segment and about half as 

 long. Habitat : Indian Ocean, on a 

 sea-snake 7). pellucida, Darwin. 



n. Carina terminating in a fork. 



A. Basal segment of the scutum directed 



towards the centre of the capitulum. 

 G. Habitat: Moreton Bay, Australia D. «ej5<M7ii (Macdonald). 



B. Jia.>al segment of tlie scutum running 



parallel to the lower margin of the 

 capitulum. 

 a. Capitulum almost as long as broad. 



7. Tergum triangular. Habitat : Japan . . D. Aymonini, Lessona. 



8. Tergunj divided by a deep notch. Habi- 



tat : Mediterranean D. Darwinii, De Filippi. 



h. Capitulum more than once and a half 

 as long as it is broad. 



9. Habitat : Madeira, attached to a Brachy- 



urous crab D. Lowei, Darwin. 



ni. Carina terminating in a cup. 



10. Scutum divided into two distinct seg- 



ments. Habitat unknown, apparently 



attaclied to a horny coralline D. orthogonia, Darwin. 



11. Scutum with a notch oidy, and indis- 



tinctly divided. Habitat: near the 

 Azores, on the spine of an Echinui<, 

 dredged from lOOU fathoms D. sessili.<>, Hoek. 



The ink of the last sentence was scarcely dry or not dry 

 when the post brought" nie the highly important ' Studieu 

 liber Cirripcden,' ju.>^t jniblished by Dr. Carl \V. S. Auri- 

 villius. The distinguished author gives descriptions and 



