1BLA CUM1NGI1. 188 



both genera, has an unusual oblong form, like a mule's 

 hoof; there is also an affinity between the two genera in 

 the size and form of the ova, in the prominent orifices of 

 the olfactory cavities, and in the peduncle not being 

 naked ; though, in these two latter respects, in the 

 structure of the cirri, and in the multiarticular caudal 

 appendages, there is an equal affinity to Pollicipes and 

 Lithotrya. I have already shown that Alepas is likewise 

 related to Ibla. 



1. Ibla Cumingii. PL IV, fig. 8. 



I. {/cem.) valvarum marginibus lateralibus, et superficie 

 interio?~e, camlets : pedunculi spinis ple?*umque annulis 

 cceruleo-fuscis. 



Fern. — Valves coloured, along the lateral margins and on 

 the upper interior surface, blue : spines on the peduncle, 

 generally ringed with blueish-brown. 



Caudal appendages barely exceeding in length the 

 pedicels of the sixth cirrus : rami of the first cirrus 

 unequal in length by about two segments. 



Male, — with scarcely a vestige of a capitulum : maxillae 

 with fewer spines than in the female. 



Ha b. — Philippine Archipelago, Island of Guiniavas ; invariably attached 

 to the peduncle of Pollicipes mitella, in groups of two or three together ; 

 Mus. Cuming. Tavoy, British Burmah Empire ; Mus. A. Gould of Boston. 



FEMALE. 



The capitulum is formed of four valves, but is hardly 

 distinct from the peduncle. The latter includes, in 

 its wide upper part, the animal's body. The valves, 

 namely, a pair of scuta and terga, are composed of an 

 extremely hard, horny substance, or properly chitine, and 

 do not contain any calcareous matter ; they are extremely 

 flat or thin, and both pairs project freely, like curved 

 horns, to a considerable height above the sack enclosing 



