Kev. T. E. R. Stebbing on Crustacea. 21 



The synoptical table of the species of Dichelaspis given by 

 Dr. Hoek in his Report of the Cirripedia of the ' Challenger' 

 may now be enlarged as follows : — 



I. Carin.i terminating in a disk. 



1. Basal segment of the scutum twice as 



wide as the occhident segment. Habi- 

 tat : eastern waters, on a crab D. Wanvickii (Gray). 



2. Basal segment of scutum three times as 



wide as the occludent segment ; tergum 

 widening downwards. Habitat : West 

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



3. Basal segment of scutum three times as 



wide as the occludent; tergum narrow- 

 ing downwards. Habitat : West Indies, 

 on a Palinurid -D. antiguce, sp. n. 



4. Basal segment narrower than the occlu- 



dent segment. Habitat : probably 

 oriental, attached to the skin of a sea- 

 snake D. Qrayii, Darwio. 



5. Basal segment much narrower than the 



occludent segment and about half as 

 long. Habitat: Indian Ocean, on a 

 sea-snake D. pellucida, Darwin. 



II. Carina terminating in a fork. 



A. Basal segment of the scutum directed 



towards the centre of the capitulum. 



6. Habitat : Moreton Bay, Australia D. neptuni (Macdonald). 



B. Basal segment of the scutum running 



parallel to the lower margin of the 

 capitulum. 

 a. Capitulum almost as long as broad. 



7. Tergum triangular. Habitat : Japan . . B. Atjmonini, Lessona. 



8. Tergum divided by a deep notch. Habi- 



tat : Mediterranean D. Danvinii, De Filippi. 



h. Capitulum more than once and a half 

 as long as it is broad. 



9. Habitat : Madeira, attached to a Bracliy- 



urous crab -. D. Lowei, Darwin. 



III. Carina terminating in a cup. 



10. Scutum divided into two distinct seg- 

 ments. Habitat unknown, apparently 



attached to a horny coralline D. orthogonia, Darwin. 



11. Scutum with a notch only, and indis- 

 tinctly divided. Habitat: near the 

 Azores, on the spine of an Echinus, 



dredged from 1000 fathoms D. sessilis, Hoek. 



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

 when the post brought me the highly important ' Studien 

 Tiber Cirripeden,' just published by Dr. Carl W. S. Auri- 

 villius. The distinguished author gives descriptions and 



